Researcher Database

Masato Shibuya
Research Faculty of Agriculture Fundamental AgriScience Research Forest Science
Professor

Researcher Profile and Settings

Affiliation

  • Research Faculty of Agriculture Fundamental AgriScience Research Forest Science

Job Title

  • Professor

Degree

  • (BLANK)
  • (BLANK)

J-Global ID

Research Interests

  • 生態   林学   Ecology   Forestry   

Research Areas

  • Life sciences / Forest science
  • Life sciences / Ecology and environmental science

Education

  •        - 1985  Hokkaido University
  •        - 1985  Hokkaido University  Graduate School, Division of Agriculture
  •        - 1982  Hokkaido University  Faculty of Agriculture
  •        - 1982  Hokkaido University  Faculty of Agriculture

Association Memberships

  • 日本植物学会   森林計画学会   日本生態学会   日本林学会   

Research Activities

Published Papers

  • Masato Shibuya
    Ecosphere 12 (9) 2150-8925 2021/09 [Refereed][Not invited]
  • 北海道の森林の風害と林分管理の考え方
    渋谷正人
    北方林業 71 41 - 44 2020/04 [Refereed][Invited]
  • カラマツの枝条形成における長枝化と花芽分化の関係
    馬場俊希, 齋藤秀之, 宮本敏澄, 渋谷正人
    北方森林研究 68 53 - 56 2020/02 [Refereed][Not invited]
  • Masato Shibuya, Satoshi Ishibashi
    Forestry: An International Journal of Forest Research 92 (4) 473 - 480 0015-752X 2019/10/01 [Refereed][Not invited]
     
    Abstract We examined typhoon windthrow patterns in stand-scale permanent plots within three natural forests and the long-term dynamics of surviving trees in two of these plots. The aim was to verify whether pre-disturbance composition and structure affected windthrow damage and stand recovery. The stands, which were in Hokkaido, the northernmost main island of Japan, differed in pre-disturbance composition (coniferous, mixed and broadleaved stands) and structure, and the basal area losses by the windthrow event were 81–93 per cent. Tree mortality was significantly related to tree size (diameter at breast height) and species. The windthrow patterns differed among the three stands; and, windthrow severity was affected by the pre-disturbance composition and structure. The mortality of trees that survived the windthrow event was ~60 per cent in the two plots. The surviving trees comprised a majority of the canopy layer in the secondary stands. The relative basal area of surviving trees decreased rapidly with increasing tree density in the stand initiation stage but differed between plots. Consequently, the pre-disturbance composition and structure influenced windthrow severity, stand recovery and secondary succession in the recovered stands.
  • Junko Morimoto, Toshihiro Umebayashi, Satoshi Suzuki, Toshiaki Owari, Naoyuki Nishimura, Satoshi Ishibashi, Masato Shibuya, Toshihiko Hara
    Landscape and Ecological Engineering 15 (2) 133 - 141 2019/04 [Refereed][Not invited]
  • 横山聡子, 菅井徹人, 江口則和, 佐藤冬樹, 斎藤秀之, 渋谷正人, 小池孝良
    北方森林研究 (67) 27‐28  2186-7526 2019/02 [Refereed][Not invited]
  • Mariko Toda, Masato Shibuya
    JOURNAL OF FOREST RESEARCH 22 (5) 303 - 308 1341-6979 2017 [Refereed][Not invited]
     
    We examined the dynamics of stand structure and composition over a 60-year period in two permanent plots in a deciduous hardwood forest in Hokkaido, Japan, which were severely disturbed by a stand-replacing windthrow, to reveal trends that could be valuable to the development of a model of forest recovery after a severe windthrow. We analyzed temporal trends in tree density, species richness and diversity, successional composition, and stand development stage in the plots. Both plots recovered as hardwood stands. Tree density and species richness increased, peaking 3540years after the windthrow, and then decreased in both plots. Based on these results, we concluded that both plots were in the stand-initiation stage for 3540years after the windthrow and then transitioned into the stem-exclusion stage. Species diversity increased with an increase in species richness during the stand-initiation stage and then decreased slightly in both plots. In both plots, successional composition did not fluctuate greatly in the 60years after the windthrow, and both returned to pre-disturbance composition during the stem-exclusion stage. The temporal trends observed in this study were remarkably similar to those in a previous study of permanent plots located near the plots used in this study. Therefore, this study provides valuable information that can be useful in the development of a stand recovery model in temperate forests after stand-replacing windthrows.
  • Ryota Kosugi, Masato Shibuya, Satoshi Ishibashi
    ECOSPHERE 7 (11) 2150-8925 2016/11 [Refereed][Not invited]
     
    We examined the dynamics of stand structure and composition over 60 years in two natural secondary forest plots in central Hokkaido, Japan, that had been severely disturbed by a stand-replacing windthrow in 1954. We determined temporal trends in tree density, species richness, species diversity, successional composition, and stand developmental stage. One of the plots contained a coniferous stand prior to the disturbance; the second plot contained a mixed stand. Tree density and species richness increased after the windthrow, and peaked in both stands in 1991, 37 years after the windthrow. Based on the dynamics of tree density and species richness, the stand development phase of both plots remained within the stand initiation stage until 1991, and then progressed to the stem exclusion stage by 2014, 60 years after the windthrow. Based on patterns of increasing tree density by species in both plots, vegetative regeneration was presumed to have contributed abundantly to the recovery of the stand after the windthrow. Species diversity increased after the windthrow as species richness increased in both stands; diversities peaked 23 or 32 years after the windthrow and declined slightly thereafter. Although the successional composition of the pre-disturbance coniferous stand regressed to an early stage under the influence of the windthrow, the relative importance of late-successional species approached the pre-disturbance value as the plot recovered. In contrast, the successional composition of the mixed conifer/hardwood plot was unaffected by the windthrow, but gradually changed to an early stage over several decades following the windthrow. The difference in successional composition between plots was likely a result of differences in pre-disturbance stand conditions between stands. Our 60-year permanent plot study determined stand and population dynamics, the duration of the stand initiation stage, and the interrelationships between diversity and species richness. Long-term permanent plot studies contribute crucial data for the interpretation of forest dynamics following disturbance.
  • ニホンカラマツとグイマツ雑種F1苗木の光合成能に対するオゾン暴露と硫酸アンモニウム付加の影響
    菅井徹人, 渡部敏裕, 来田和人, 齋藤秀之, 渋谷正人, 小池孝良
    北方森林研究 64 63 - 66 2016/02 [Refereed][Not invited]
  • Sugai Tetsuto, Watanabe Toshihiro, Kita Kazuhito, Saito Hideyuki, Shibuya Masato, Koike Takayoshi
    The Japanese Forest Society Congress 日本森林学会 127 730 - 730 2016 
    [in Japanese]
  • Wada Hisayuki, Saito Hideyuki, Shibuya Masato, Koike Takayoshi
    The Japanese Forest Society Congress 日本森林学会 127 334 - 334 2016 
    [in Japanese]
  • Fujita Saki, Kita Kazuhito, Saioto Hideyuki, Shibuya Masato, Koike Takayoshi
    The Japanese Forest Society Congress 日本森林学会 127 (0) 742 - 742 2016 [Refereed][Not invited]
     
    [in Japanese]
  • Chiaki Yoshii, Yuichi Yamaura, Masashi Soga, Masato Shibuya, Futoshi Nakamura
    JOURNAL OF FOREST RESEARCH 20 (1) 167 - 174 1341-6979 2015/02 [Refereed][Not invited]
     
    We examined potentially contrasting conservation benefits of land sparing (land-use specialization) and land sharing (multiple-use forestry) strategies in forested landscapes by investigating relationships between bird functional group densities and basal areas of coniferous trees (an index of plantation intensity) in Sakhalin fir (Abies sachalinensis) and Sakhalin spruce (Picea glehnii) plantations. Densities of most bird functional groups increased with decreasing plantation intensity in both plantation types. In many cases, linear models were best for descriptors of bird density-plantation intensity relationships, but statistical support of linear and nonlinear (quadratic) models was similar. This outcome indicates that ecological benefits of land sparing and land sharing are potentially comparable in the plantations we studied. In real landscapes, land-use decision making depends on a variety of factors other than biodiversity conservation (e.g., social and biophysical factors). Furthermore, niche theory also predicts that population densities could linearly respond to environmental gradients. When density-intensity relationships are linear, as in this study, land-sparing and land-sharing strategies provide similar benefits in terms of biodiversity conservation, and contrasting land-use strategies could be flexibly chosen to enhance the accommodation of biodiversity conservation to resource production.
  • Hideyuki Saito, Akio Koizumi, Sampang Gaman, Prawira Yuda, Penyang, Masato Shibuya
    Tropical Peatland Ecosystems 513 - 549 2015/01/01 [Refereed][Not invited]
     
    Forestry is an important land-use type in tropical peatlands that provides socio-economic and environmental services. Currently, tropical peatland forestry has contributed to the timber industry, but timber harvest has unfortunately caused degradation and deforestation in massive areas of tropical peat swamp forests. Consequently, serious reductions of wood resources and environmental services occurred in peatland forests, with land managers being caught in a forest management dilemma between the needs for timber production, conservation and restoration of environmental services. The woody materials produced from peatland forests have various and unique characteristics these forests also provide commercially valuable timber. Given that degraded peatland can be restored to forest composed of indigenous trees of high ecological and commercial value, land managers feel confident that they can provide the benefits of both timber production and improved environmental services. First, during planting one must understand which tree species are best adapted to local site-conditions if successful reforestation techniques are to be developed. Cost-effectiveness must also be concerned, especially in degraded peatland, where considerable flooding may determine the survival and growth rates of seedlings and the operating cost. Second, as a management strategy, a reforestation program should be required to provide multiple benefits, not only timber production and environmental services, but these programs should also improve socio-economic conditions that ensure the ongoing livelihood of local people. In the future, tropical peatland forestry should play the roles of providing for both the restoration and sustainable use of wood resources in a way that benefits both the local community and the global market.
  • Watanabe Hanami, Fujita Saki, Meng Fakeng, Tamai Yutaka, Saito Hideyuki, shibuya Masato, Koike Takayoshi
    The Japanese Forest Society Congress 日本森林学会 126 (0) 255 - 255 2015 [Refereed][Not invited]
     
    [in Japanese]
  • 窒素沈着がダケカンバとシラカンバの成長と外生菌根の発達に与える影響
    木基二, 渡辺誠, 斎藤秀之, 渋谷正人, 玉井裕, 小池孝良
    北方森林研究 62 65 - 66 2014/02 [Refereed][Not invited]
  • Jeong-Seok Kang, Masato Shibuya, Chang-Seob Shin
    Forest Science and Technology 10 (1) 33 - 39 2158-0103 2014/01 [Refereed][Not invited]
     
    This research was conducted to provide effective forest management through forest tree production and forest land changes which took place after the forest-tending works in the plantation of Pinus koraiensis. It has been shown that the current annual diameter growth of trees in regions which implemented forest-tending projects in 2005 had increased by 142.9% compared to those which did not implement the forest-tending projects. In 2006, the current annual diameter growth of trees in implemented regions increased by 132.6% compared to those which did not implement forest-tending. Additionally, in the Pinus koraiensis plantation of II-III age classes where forest-tending projects works were implemented, the growth in diameter started to show a clear increase in the year following the implementation, and the maximum effects were displayed within 3-5 years. Thereafter, the growth gradually started to slow down. Therefore, implementing forest-tending works repetitively with a minimum period of 5 years would be considered appropriate. Soil moisture during the rainy season did not show significant differences as the soil moisture content remained at 40.4-43.0%. However, during the dry season, regions which did not implement forest-tending showed an average of 20.4%, and regions which implemented forest-tending showed an average of 26.6%, and the differences were greater when compared to the rainy season. Due to the control in the density of the number of forest trees due to forest-tending and forest thinning works, the number of understory woody plant species increased from 17 to 30 and the number of herbaceous plant species increased from 20to 44. Furthermore, as the density of standing trees was reduced to about 50% in places where forest-tending works were implemented, crown length ratios increased greatly from 46.1% to 62.1% and became a great help to the growth of forest trees. © 2014 © 2014 Korean Forest Society.
  • Tsutomu Urata, Masato Shibuya, Akio Koizumi, Hiroyuki Torita, JooYoung Cha
    JOURNAL OF FOREST RESEARCH 17 (1) 65 - 71 1341-6979 2012/02 [Refereed][Not invited]
     
    To examine the hypothesis that both stem and crown mass affect the resistance of a tree to uprooting and that tree resistance increases with increasing crown mass, we conducted tree-pulling experiments on three Picea glehnii plantations (stands A, B, and C: 27-32 years old) that differed in tree density and slenderness ratio. Allometries between crown and stem masses and between the critical uprooting moment and stem mass differed significantly among the three stands, with the crown mass and critical moment significantly larger in stand C than in stands A or B, despite the same stem mass. These results quantitatively verified our hypothesis. Allometries between crown and stem masses and between critical uprooting moment and stem mass were highly significant in each stand but were stand specific. Therefore, these allometries can be used to estimate tree resistance to uprooting in a given stand but not for data compiled from stands of various conditions and tree shapes. The allometry between critical moment and aboveground mass did not differ among the three Picea stands; thus, it is not stand specific and is generally appropriate to use for estimating tree resistance. To increase tree resistance to uprooting, we recommend light management for Picea glehnii plantations and probably other coniferous plantations as well.
  • Keisuke Yano, Masato Shibuya
    JOURNAL OF FOREST RESEARCH 15 (2) 108 - 114 1341-6979 2010/04 [Refereed][Not invited]
     
    The objectives of this study were to investigate differences in the site preferences of seedlings of Picea jezoensis and Abies sachalinensis on decayed logs, and to examine the occurrence patterns of seedlings and saplings of the two species and whether they occur together or separately on logs. We characterized the habitats of 1-2-year-old seedlings of the two species on logs and examined the relationship of the two species on logs by growth stages in two plots. One plot had been disturbed about 50 years ago whereas the other had not for a long time. Although the thickness of moss and the litter layer in the habitats of 1-2-year-old seedlings were significantly different between the two species, the two species could occur together. In one study plot, seedlings and saplings of the two species occurred together. The initial occurrence pattern of the seedlings affected the occurrence patterns of the saplings on logs. The occurrence patterns of the seedlings and saplings of the two species on logs seemed to be affected by the abundance of seed trees. In the other study plot saplings of the two species occurred separately, but one species was not always competitively superior to the other species. Disturbance history affected the occurrence patterns of the saplings of the two species on decayed logs at the two study plots. Consequently, it is concluded that seed dispersal and the abundance of available logs, which are usually affected by disturbance, are significant factors in the natural regeneration of conifers in Hokkaido.
  • Hayato Iijima, Masato Shibuya
    JOURNAL OF FOREST RESEARCH 15 (1) 46 - 54 1341-6979 2010/02 [Refereed][Not invited]
     
    The abundance of Picea jezoensis, a major conifer tree species in Hokkaido, northern Japan, is currently decreasing due to the lack of suitable conditions for recruitment and intensive harvests. To contribute to the development of sustainable forest management in Hokkaido, suitable substrates for natural regeneration of P. jezoensis were evaluated during a 4-year experimental study using seed additions in a natural coniferous forest. The environmental conditions (moss height, log hardness, extent of the humus layer, and light conditions) of fallen logs were measured. Moss height was categorized into three groups: 0 mm, Bark; 0-20 mm, Mthin; and a parts per thousand yen20 mm, Mthick. The germination rates of P. jezoensis were highest on Mthin, intermediate on Bark, and lowest on Mthick. Survival rates were low on Mthick, did not differ between Bark and Mthin, and increased with enhanced light. Growth increased with light, but the root allocation of seedlings was not affected by any environmental conditions. From these results, we determined that fallen logs with no or thin moss cover under bright conditions were most suitable for P. jezoensis regeneration. We discuss the generality of our results in relation to a co-occurring tree species in Hokkaido and the results of other regions.
  • TORITA Hiroyuki, SHIBUYA Masato, KOIZUMI Akio
    Journal of the Japanese Forest Society 日本森林学会 92 (3) 127 - 133 1349-8509 2010 [Refereed][Not invited]
     
    It is important to be able to assess the risk of wind damage to stands in a long rotation forestry operation. In this study a mechanistic model was used to examine the effect of different planting densities and thinning frequencies on the resistance of Japanese larch stands to wind damage. Critical wind speeds at a height of 10 m above ground level required to cause uprooting or stem breakage was used as the index of resistance to wind damage. All wind damage to trees was uprooting. The resistance of stands at lower planting densities was higher than that of stands at higher planting densities. Differences in thinning frequency affected stand resistance: management for a low yield index (Ry=0.6∼0.7) increased the resistance of stands compared with management for a high yield index (Ry=0.7∼0.8). As stand age increased, resistance to wind damage decreased until a tree was 20∼30 years of age. Thereafter, resistance to wind damage increased as stand age increased. This 20- to 30-year period coincided with the period during which slenderness ratios (H/D) were the highest of all growing stages. Differences in a long rotation forestry operation at high site index had a strong effect on the resistance to wind damage.
  • SHIBUYA Masato
    Journal of the Japanese Forest Society 一般社団法人日本森林学会 91 (5) 307 - 312 1349-8509 2009 [Refereed][Not invited]
     
    Windthrow factors in windbreaks in Bibai, Hokkaido, which was damaged by typhoon No. 18 (max wind speed 21m/s) in 2004, were analyzed. The windbreaks investigated were plantations of Picea abies, Larix leptolepis, Betula platyphylla, or Fraxinus mandshurica. Diameter at breast height (DBH) and the type of damage (e.g., "uprooted", "snapped", or "undamaged") were determined for each tree in 21 quadrats. The vertical profile of soil hardness was also measured using a simplified dynamic cone penetrometer in each quadrat. The maximum moment of resistance against uprooting was measured by pulling the trunk of a standing tree laterally for each species to determine why the sensitivity to windthrow differed. The sensitivity to windthrow decreased in the order L. leptolepis>P. abies>B. platyphylla>F. mandshurica. The sensitivity to windthrow had a bell-shaped distribution with a peak at DBH=30cm. L. leptolepis and B. platyphylla were more likely to be "uprooted", while P. abies was more likely to be "snapped". Soil hardness was not closely related to the sensitivity to windthrow. The moment of resistance against uprooting was higher for F. mandshurica than for the other three species. The sensitivity to windthrow might be related to tree height and leaf mass, in addition to the moment of resistance against uprooting.
  • Hayato Iijima, Masato Shibuya, Hideyuki Saito
    ECOSCIENCE 16 (3) 352 - 360 1195-6860 2009 [Refereed][Not invited]
     
    The coexistence mechanism of Abies sachalinensis and Picea jezoensis, which usually regenerate on fallen logs, was examined with respect to differences in suitable conditions for germination and shade tolerance in Hokkaido, northern Japan. Germination conditions were evaluated through the effect of log hardness, moss height, light condition, and shading by taller seedlings on fallen logs, and shade tolerance was evaluated by physiological and morphological traits and survival dynamics in a natural coniferous forest. In contrast to P. jezoensis, the number of germinated seedlings of A. sachalinensis increased with moss height. The number of germinated seedlings decreased with shading only in P. jezoensis. Consequently, it is suggested that germination of P. jezoensis is limited to fresh, recently fallen logs. The survival rate of A. sachalinensis under low-light conditions (< 5% of relative photosynthetic photon flux density) was higher than that of P. jezoensis. Abies sachalinensis had a higher leaf mass ratio (total leaf mass/total mass) and leaf area ratio (total leaf area/total mass) than P. jezoensis. In conclusion, earlier establishment of P. jezoensis on fallen logs and higher shade tolerance of A. sachalinensis are suggested to contribute to the coexistence of these 2 species.
  • NONODA Shuichi, SHIBUYA Masato, SAITO Hideyuki, ISHIBASHI Satoshi, TAKAHASHI Masayoshi
    Journal of the Japanese Forest Society 一般社団法人日本森林学会 90 (2) 103 - 110 1349-8509 2008 [Refereed][Not invited]
     
    To determine the invasion and growth processes of natural broadleaved trees in a conifer plantation, and to examine the influence of forest operations on these processes, we investigated the species composition, the number of annual rings at 0.3 m from the ground and annual diameter increments of natural broadleaved trees in an 80-year-old Abies sachalinensis plantation in Hokkaido, northern Japan. Species number and the density of broadleaved trees increased after thinning. The frequency of the number of annual rings at 0.3 m from the ground was apparently high in years following thinnings, except for the first thinning. Therefore, plantation thinning induced natural invasion of broadleaved trees. Furthermore, the diameter increments of many broadleaved trees apparently increased after thinning. Thinning positively influenced the growth of broadleaved trees in the plantation. Mean annual diameter increments differed between late-successional and gap-phase species. The mean diameter increment and increases in the increment after a thinning were larger in gap-phase species than in late-successional species. Additionally, the individual ratio and frequency of apparent increases in diameter increments after thinning were larger in older broadleaved trees. Consequently, we conclude that age and ecological characteristics of broadleaved trees in an Abies sachalinensis plantation influence their growth and the influence of thinning on growth.
  • Yamada Tadayasu, Hayashi Toshiro, Saito Hideyuki, Shibuya Masato
    The Japanese Forest Society Congress 日本森林学会 118 109 - 109 2007
  • Initial screening of fast-growing tree species that can tolerate dry tropical peatlands in Central Kalimantan, Indonesia.
    Saito H, Shibuya M, Tuah SJ, Turjaman M, Takahashi K, Jamal Y, Segah H, Putir PE, Limin SH
    Journal of Forestry Research 2 107 - 115 2005 [Refereed][Not invited]
  • 渋谷 正人
    森林科学 : 日本林学会会報 日本森林学会 31 66 - 67 0917-1908 2001/02/01
  • Chronosequential analysis of aboveground biomass and the carbon and nitrogen contents in natural Larix stands in eastern Siberia
    Shibuya M, Tsuno Y, Saito H, Takahashi K, Sawamoto T, Hatano R, Isaev AP, Maximov TC
    Bulletin of Research Center for North Eurasia and North Pacific Regions, Hokkaido, University 1 57 - 66 2001 [Not refereed][Not invited]
  • Aboveground biomass, nitrogen and carbon contents in Larix stands in eastern Siberia
    Tsuno Y, Shibuya M, Saito H, Takahashi K, Sawamoto T, Hatano R, Isaev AP, Maximov TC
    Proceedings of the ninthe symposium on the joint Siberian permafrost studies between Japan and Russia in 2000 68 - 74 2001 [Not refereed][Not invited]
  • Characteristics of Nitrogen cycling in permafrost regional ecosystems in Yakutsk, Russia
    Hatano R, Sawamoto T, Shibuya M, Saito H, Tuno Y, Takahashi K, Kobayashi Y, Iwahana G, Desyatkin RV, Isaev AP
    Proceedings of the ninthe symposium on the joint Siberian permafrost studies between Japan and Russia in 2000 99 - 103 2001 [Not refereed][Not invited]
  • Effect of forest fire on NEP in Taiga soil ecosystems, near Yakutsk, Russia
    Sawamoto T, Hatano R, Shibuya M, Saito H, Tuno Y, Takahashi K, Isaev AP, Desyatkin RV, Maximov TC
    Proceedings of the ninthe symposium on the joint Siberian permafrost studies between Japan and Russia in 2000 120 - 127 2001 [Not refereed][Not invited]
  • Characteristics of ground vegetation at Nelegar Alas
    Takahashi K, Hatano R, Shibuya M, Sawamoto T, Yamamoto G, Tsuno Y, Isaev AP, Maximov TC
    Proceedings of the eighth symposium on the joint Siberian permafrost studies between Japan and Russia in 1999 77 - 82 2000 [Not refereed][Not invited]
  • Effect of forest fire on physico-chemical properties of Taiga permafrost soils, near Yakutsk
    Hatano R, Sawamoto T, Desyatkin RM, Isaev AP, Takahashi K, Shibuya M, Maximov TC
    Proceedings of the eighth symposium on the joint Siberian permafrost studies between Japan and Russia in 1999 111 - 120 2000 [Not refereed][Not invited]
  • Effect of forest fire on carbon cycling in Taiga soil-plant system, near Yakutsk
    Sawamoto T, Hatano R, Shibuya M, Takahashi K, Isaev AP, Maximov TC
    Proceedings of the eighth symposium on the joint Siberian permafrost studies between Japan and Russia in 1999 230 - 236 2000 [Not refereed][Not invited]
  • Allometry and biomass in a 22-year-old stand of Larix cajanderi in eastern Siberia
    Shibuya M, Sugiura T, Takahashi K, Sawamoto T, Hatano R, Cha JY, Fukuyama K, Isaev AP, Maximov TC
    Proceedings of the seventh symposium on the joint Siberian permafrost studies between Japan and Russia in 1998 25 - 32 1999 [Not refereed][Not invited]
  • Soil respiration and fluxes of N2O and CH4 in Siberian-Taiga ecosystems with different histories of forest fire
    Sawamoto T, Hatano R, Takahashi K, Shibuya M, Isaev AP, Desyatkin RM, Maximov TC, Ivanov BI
    Proceedings of the seventh symposium on the joint Siberian permafrost studies between Japan and Russia in 1998 77 - 89 1999 [Not refereed][Not invited]
  • Yajima Takashi, Nakamura Futoshi, Shimizu Osamu, Shibuya Masato
    Research bulletins of the College Experiment Forests, Hokkaido University 北海道大学 55 (1) 216 - 228 0367-6129 1998 [Refereed][Not invited]
  • YAMAGUCHI Shin-ichi, YAJIMA Takashi, SHIBUYA Masato, TAKAHASHI Kunihide
    Japanese Journal of Forest Environment 森林立地学会 39 (2) 94 - 100 0388-8673 1997 
    The survival of tree seedlings and the amount of dispersed and buried seeds were surveyed. Also, the possibility of plant recovery was discussed on the nearly bare site; which is the result of browsing and trampling by sika deer (Cervus nippon yezoensis) in the broad-leaved stands of Nakanoshima Island, Hokkaido. Tree seedlings disappeared by 70-90% in first twenty days of observation and by 90% within fifty days in all plots. Browsing was the most serious factor, causing more than 80% of seedling damage. The number of dispersed seeds was 238-5,820/m^2 and 21-394/m^2 in 1995 and 1996, respectively. The number of seed species was 11-22 and 7-19 in 1995 and 1996, respectively. A considerable number of viable buried seeds were found, 50-2,700/m^2, and they were composed of 8-20 plant species. Both dispersed and buried seeds contained a large percentage of woody plant species. The number of buried seeds, the number of species and the ratio of viable seeds varied among the study sites, and there were no clear differences between open sites and sites in which the deer were excluded by enclosures. Therefore, the trampling of the forest floor by sika deer did not greatly influence the survival of buried seeds. According to the results of this study, plant recovery is difficult under heavy use by sika deer, however, potential revegetation appears to be possible, for the present.

Works

  • 北方森林圏の火災によって引き起こされる陸域-大気相互作用の検出と予測
    1999
  • Detection and Prediction of Land-Atmosphere interaction Changes Induced by Boreal Forest Fire
    1999
  • 温暖化ガスにかかわる永久凍土撹乱の制御技術
    1997
  • Control technology of permafrost disturbance affecting the greenhouse-gas dynamics
    1997

MISC

  • 岡本昇太, 齋藤秀之, 渋谷正人, 小池孝良  北方森林研究  (66)  63‐64  2018/02/28  [Not refereed][Not invited]
  • 西井あす香, 菅井徹人, 玉井裕, 斎藤秀之, 澁谷正人, 小池孝良  北方森林研究  (66)  27‐30  2018/02/28  [Not refereed][Not invited]
  • 坪奈津美, WANG Yannan, 菅井徹人, 渡部敏裕, 斎藤秀之, 澁谷正人, 小池孝良  北方森林研究  (66)  55‐57  2018/02/28  [Not refereed][Not invited]
  • 増井 昇, 望月 智貴, 谷 晃, 斎藤 秀之, 渋谷 正人, 小池 孝良  北方森林研究 = Boreal forest research  (65)  23  -25  2017/02
  • 渋谷 正人, 石橋 聰  北方林業 = Northern forestry, Japan  68-  (2)  76  -79  2017
  • 異なるO3濃度及び土壌条件下で生育した落葉広葉樹稚樹の虫害.
    井上航, Vanderstock A, 崎川哲一, 中村誠宏, 齊藤秀之, 渋谷正人, 小池孝良  北方森林研究  64-  41  -43  2016  [Not refereed][Not invited]
  • 岩﨑 ちひろ, 渋谷 正人, 石橋 聰, 高橋 正義  北海道大学演習林研究報告 = Research bulletin of the Hokkaido University Forests  70-  (1)  21  -30  2015/03  
    カラマツ人工林の長伐期施業に必要な条件を検討するため、北海道十勝地方の54~80年生のカラマツ人工林20林分で林相の特徴を把握した。また、長伐期化する林分に重要な風害抵抗性に着目し、耐風性の指標としてよく用いられる形状比と樹冠長率を検討した。その結果、密度や蓄積、収量比数が小さく、疎仕立て状の林分が多かった。平均形状比は68~90、平均樹冠長率は0.42~0.62であった。既存研究で風害抵抗性が高いカラマツ人工林は、平均形状比が70未満、平均樹冠長率が0.45以上とされているが、本研究の結果では、樹冠長率は既往の値と一致したが、形状比は一致しなかった。このことから、樹冠長率は風害抵抗性を指標する樹形要素として汎用性が高い可能性があると考えられ、その場合平均樹冠長率が0.45以上であることがカラマツの長伐期林に必要な条件と仮定された。そこで、この仮定に基づいて平均樹冠長率0.45以上を維持する密度管理方法を検討した。その結果、I等地では、収量比数を25年生時に0.8以下、30年生以上では0.6未満で管理する必要があり、また林齢にともなって、さらに収量比数を小さく疎な状態に維持しなければならないことが明らかとなった。
  • SANO Yuuki, SHIBUYA Masato  Journal of the Japanese Forest Society  97-  25  -29  2015  [Refereed][Not invited]
  • 戸田 真理子, 渋谷 正人  北方林業 = Northern forestry, Japan  66-  (8)  229  -232  2014/08
  • 小杉 陵太, 渋谷 正人  北方林業 = Northern forestry, Japan  66-  (8)  225  -228  2014/08
  • SAKIKAWA TETSUICHI, OIKAWA MONTA, WATANABE MAKOTO, SAITO HIDEYUKI, SHIBUYA MASATO, KOIKE TAKAYOSHI  日本森林学会大会学術講演集(CD-ROM)  125th-  172  2014/03/26  [Not refereed][Not invited]
  • Shibuya Masato, Koizumi Akio, Torita Hiroyuki  Eurasian Journal of Forest Research  17-  (1)  11  -17  2014  
    We examined tree resistance to uprooting in relation to tree shape using a simple, qualitative model forthe ratio of the resistive moment to the overturning moment. For this analysis, we used model trees andvaried the crown size for a fixed stem size for a ratio of crown mass to stem mass that varied from 0.1to 1. The results predicted the phase transition in the resistance trend in relation to the crownmass/stem mass ratio. Resistance increased on both sides of the crown mass/stem mass ratio, and wasminimized at intermediate ratios. This indicates that crown expansion contributes to resistance to theright side of minimum, and vice versa. The same trend was recognized for actual Sitka spruce tree data.These results were consistent with previous observations of tree resistance to uprooting: trees with asmall slenderness ratio (ratio of height to diameter at breast height) are resistant to uprooting, andtrees/stands are vulnerable to uprooting after thinning, especially after belated thinning. Werecommend sparse tree densities in plantations to manage the risk of physical tree damage such asoverturning and stem failure. However, quantitative analyses of wind damage to trees and stands arenecessary to improve risk management of plantations. The results of this study can be incorporated intosuch quantitative analyses.
  • 渋谷 正人  北方林業 = Northern forestry, Japan  65-  (11)  327  -330  2013/11
  • 浦田 格, 渋谷 正人, 鳥田 宏行  北海道大学演習林研究報告  69-  (1)  1  -10  2013/01  
    北海道中央部の支笏湖周辺の平坦地に位置するトドマツ人工林とカラマツ人工林を対象に、林分の平均形状比を用いて、風倒被害を軽減するための林分管理指針を検討した。林分調査データと、各樹種の林分密度管理図を利用して、平均形状比-平均樹高関係を収量比数(Ry)ごとに求め、それらと調査林分の平均形状比を比較した。その結果、両樹種で、風倒被害林分と無被害林分でRy値に差があり、被害林分でRy値が大きかった。境界値はトドマツでRy=0.7で、カラマツでRy=0.4であった。この結果と林分密度管理図によって、風倒被害を軽減するための林分管理指針を、樹種ごとに検討した。その管理指針によれば、風倒被害を軽減するためには若齢時からの密度管理が重要であり、またトドマツ、カラマツ人工林の一般的な疎仕立て管理よりさらに低密度での管理が必要であることが明らかとなった。さらに調査対象地域は風害を受けやすい地域であるため、本研究で検討した管理指針は、北海道の他地域の平坦地にも適用可能であろうと考えられた。
  • 小倉俊治, 斎藤秀之, 門松昌彦, 渋谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  123rd-  ROMBUNNO.PB195  -Pb195  2012/03/26  [Not refereed][Not invited]
  • 佐久間彬, 渡辺誠, 渡邊忠, 若松歩, 斎藤秀之, 澁谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  123rd-  ROMBUNNO.J09  2012/03/26  [Not refereed][Not invited]
  • SHIBUYA Masato  Boreal forest research  (60)  1  -2  2012/02/18
  • HARA Yuko, ITO Hirotaka, MAO Quao-zhi, WATANABE Makoto, HOSHIKA Yasutomo, TAKAGI Kentaro, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  Boreal forest research  60-  (60)  39  -40  2012/02/18  [Not refereed][Not invited]
  • SAKUMA Akira, YAMAGUCHI Takashi, NOGUCHI Izumi, WATANABE Tadashi, WAKAMATSU Ayumu, WATANABE Makoto, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  Boreal forest research  60-  (60)  43  -44  2012/02/18  [Not refereed][Not invited]
  • OIKAWA Monta, MATSUKI Sawako, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  Boreal forest research  60-  (60)  111  -112  2012/02/18  [Not refereed][Not invited]
  • 稲田友弥, 斎藤秀之, 渋谷正人, 小池孝良, 井上京, HARSANTO Fransiskus A, GAMAN Sampang, PRAWIRA Yuda, LIMIN Suwido H  日本森林学会大会学術講演集(CD−ROM)  122nd-  ROMBUNNO.PA1-13  2011/03/25  [Not refereed][Not invited]
  • 及川聞多, 斎藤秀之, 澁谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  122nd-  ROMBUNNO.PA2-111  2011/03/25  [Not refereed][Not invited]
  • 伊藤寛剛, 渡辺誠, 渡辺誠, 毛巧芝, 中路達郎, 笹賀一郎, 斎藤秀之, 渋谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  122nd-  ROMBUNNO.PB2-73  2011/03/25  [Not refereed][Not invited]
  • 小出智也, 斎藤秀之, 井上京, 小池孝良, 渋谷正人, GAMAN Sampang, YUDA Prawira, LIMIN Suwido  日本森林学会大会学術講演集(CD−ROM)  122nd-  ROMBUNNO.PA1-33  2011/03/25  [Not refereed][Not invited]
  • 伊藤寛剛, 渡辺誠, 渡辺誠, 毛巧芝, 斎藤秀之, 渋谷正人, 笹賀一郎, 小池孝良  日本生態学会大会講演要旨集  58th-  466  2011/03/08  [Not refereed][Not invited]
  • 稲田直輝, 渡辺誠, 渡辺誠, 澁谷正人, 斎藤秀之, 小池孝良  日本生態学会大会講演要旨集  58th-  464  2011/03/08  [Not refereed][Not invited]
  • ITO Hirotaka, WATANABE Makoto, MAO Qiao-zhi, NOVRIYANTI Eka, UEDA Tatsushiro, TAKAGI Kentaro, SASA Kaichiro, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  日本森林学会北海道支部論文集  59-  (59)  35  -38  2011/02/19  [Not refereed][Not invited]
  • INADA Naoki, WATANABE Makoto, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  日本森林学会北海道支部論文集  59-  (59)  41  -44  2011/02/19  [Not refereed][Not invited]
  • SHIBUYA Masato, URATA Tsutomu, TORITA Hiroyuki, IIJIMA Hayato  Japanese Journal of Forest Environment  53-  (2)  53  -59  2011  [Refereed][Not invited]
     
    We investigated the relationship between windthrow damage and tree shape in coniferous plantations that had suffered windthrow in 2004 in central Hokkaido, northern Japan, to examine the effect of tree shape on the resistance of trees and stands to windthrow. We investigated the following tree-shape parameters in damaged and undamaged plantations of Larix kaempferi, Abies sachalinensis, and Picea jezoensis, major plantation species in Hokkaido, 2-4 years after the windthrow: slenderness ratio (H/D ratio), crown length/tree height ratio (C_L ratio), and the height of the center of gravity of the wind load/tree height ratio (H_W ratio). In L. kaempferi and A. sachalinensis plantations, mean H/D ratios were distinct between damaged and undamaged plantations; the mean H/D ratio was lower in undamaged plantations than in damaged plantations. Based on differences in C_L and H_W ratios, the crown size of L. kaempferi and A. sachalinensis trees was larger in undamaged plantations than in damaged plantations. In P. jezoensis plantations, similar tendencies in H/D, C_L, and H_W ratios were observed. These data suggest a definite relationship between tree shape and resistance to windthrow, whereby trees with small slenderness ratios and large crowns are more resistant to windthrow. It is also suggested that vulnerability of coniferous plantations to windthrow changes drastically at thresholds in H/D and C_L ratios. Therefore, coniferous plantations should be managed to reduce windthrow risk. Because tree shape is heavily influenced by stand density, risk management on plantations should include density control initiatives.
  • 中原治, 石倉究, 花田健太郎, 竹内史子, 高橋正通, 永田修, 杉戸智子, 信濃卓郎, 渋谷正人, 波多野隆介  日本土壌肥料学会講演要旨集  56-  6  2010/09/07  [Not refereed][Not invited]
  • 佐藤香織, 小林真, 斎藤秀之, 澁谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  121st-  ROMBUNNO.PA2-16  2010/04/02  [Not refereed][Not invited]
  • 末次直樹, 小池孝良, 澁谷正人, 斎藤秀之  日本森林学会北海道支部論文集  (58)  35-36  2010/02/19  [Not refereed][Not invited]
  • 花田 健太郎, 竹内 史子, 北村 さやか, 中原 治, 永田 修, 杉戸 智子, 高橋 正通, 澁谷 正人, 波多野 隆介  日本土壌肥料学会講演要旨集  55-  254  -254  2009/09/15
  • 長谷川由布子, 小林真, 柴田英昭, 高橋廣行, 佐藤冬樹, 斎藤秀之, 渋谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  120th-  ROMBUNNO.PA3-05  2009/03/25  [Not refereed][Not invited]
  • 丸上裕史, 斎藤秀之, 井上京, 渋谷正人, 小池孝良, SUWIDO Limin  日本森林学会大会学術講演集(CD−ROM)  120th-  ROMBUNNO.PB3-19  2009/03/25  [Not refereed][Not invited]
  • SHIROTA Tetsuoh, SAITO Hideyuki, SHIBUYA Masato, TAKAHASHI Kunihide, Maximov Trofim C.  Transactions of the Meeting in Hokkaido Branch of the Japanese Forest Society  (57)  65  -67  2009/02/21
  • 城田徹央, 斎藤秀之, 渋谷正人, 高橋邦秀, MAXIMOV Trofim C  日本森林学会北海道支部論文集  (57)  65-67  2009/02/21  [Not refereed][Not invited]
  • 花田健太郎, 竹内史子, 北村さやか, 中原治, 永田修, 杉戸智子, 高橋正通, 澁谷正人, 波多野隆介  日本土壌肥料学会講演要旨集  54-  10  2008/09/09  [Not refereed][Not invited]
  • 石堂光, 斎藤秀之, 渋谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  119th-  I16  2008/03/26  [Not refereed][Not invited]
  • 丸上裕史, 斎藤秀之, SAMPANG Gaman, LIMIN Suwido, 渋谷正人, 小池孝良  日本森林学会大会学術講演集(CD−ROM)  119th-  P3G06  2008/03/26  [Not refereed][Not invited]
  • 唐木貴行, 近藤哲也, 渡邉陽子, 門松昌彦, 秋林幸男, 笹賀一郎, 斉藤秀之, 渋谷正人, 小池孝良  日本生態学会大会講演要旨集  55th-  420  2008/03/14  [Not refereed][Not invited]
  • 飯島 勇人, 渋谷 正人  Forest tree breeding of Hokkaido.  51-  (1)  20  -23  2008
  • KARAKI Takayuki, KONDO Tetsuya, WATANABE Yoko, KADOMATSU Masahiko, AKIBAYASHI Yukio, SASA Kaichiro, SAITO Hideyuki, SHIBUYA Masato, KOIKE Takayoshi  Transactions of the Meeting in Hokkaido Branch of the Japanese Forest Society  56-  (0)  21  -23  2008  [Not refereed][Not invited]
  • Tatiana Vassileva Stankova, Masato Shibuya  NEW FORESTS  34-  (2)  123  -141  2007/09  [Not refereed][Not invited]
     
    Stand Density Control Diagram (SDCD) is a stand-level mathematical model, which describes the relationships between yield, density and mortality throughout all stages of stand development. The SDCD is primarily used to derive density control schedules by management objectives. The main objectives of the present study are to define a modified model of SDCD for application to Scots pine (Pinus sylvestris L.) and Austrian black pine (Pinus nigra Arn.) plantations in Bulgaria, to examine the fitness of the model with representative experimental data sets from plantations of both species and to present a way of direct application of the SDCDs for practical purposes. The constructed SDCDs characterize the spatial-temporal dynamics of the pine plantations in a broad range of densities, forest sites and growth stages from 4 to 26 (28) m of dominant height class. The full density lines were fixed with self-thinning exponents alpha = 1.69 and alpha = 1.75 for Scots pine and Austrian black pine, respectively, and the trajectories of natural thinning for 23 initial densities (444-40000/ha) were determined. A direct way for application of the SDCDs to the plantation management was designed to estimate the optimal initial densities for the maximum attainable final yield and large-size wood production by self-thinning stands.
  • Hayato Iijima, Masato Shibuya, Hideyuki Saito  JOURNAL OF FOREST RESEARCH  12-  (4)  262  -269  2007/08  [Not refereed][Not invited]
     
    We surveyed the germination number (Ncs) of 2-year and a 1-year survival of Abies sachalinensis and Picea jezoensis seedlings and saplings on 29 fallen logs from 2004 to 2005 in a natural coniferous forest in Hokkaido, northern Japan, in relation to the surface and light conditions of fallen logs. Moss height ( H-moss), log hardness (Hardness), and the area of fallen log (Area) were measured as the surface conditions by each 1-m block from bottom to top of all fallen logs. The relative photosynthetic photon flux density (rPPFD) 10 cm above the tallest seedling in each block was measured as the light condition. In addition, the height of the tallest seedling or sapling in each block (H-max), the difference between a height of each seedling and sapling and the Hmax (Shading), and a height of seedlings and saplings in 2004 (H-ini) were considered. Ncs of A. sachalinensis was affected by Hardness and Area, whereas Ncs of P. jezoensis was affected by Hmoss, Hardness, Area, Hmax, and rPPFD. The survival of seedlings (height < 5 cm) and saplings (5 cm <= height < 50 cm) were affected by Hini, rPPFD, and shading for both species. However, the survival of P. jezoensis saplings was more sensitive to decrease in rPPFD and increase of shading than that of A. sachalinensis. Therefore, seedling emergence was influenced by surface conditions, whereas survival was affected by light conditions. Furthermore, P. jezoensis emergence and survival were more sensitive to surface and light conditions than that of A. sachalinensis.
  • 林登志郎, 山田宰靖, 斎藤秀之, 澁谷正人  日本森林学会大会学術講演集(CD−ROM)  118th-  D14  2007/04/01  [Not refereed][Not invited]
  • 山田宰靖, 林登志郎, 斎藤秀之, 澁谷正人  日本森林学会大会学術講演集(CD−ROM)  118th-  D13  2007/04/01  [Not refereed][Not invited]
  • 飯島勇人, 渋谷正人, 斎藤秀之  日本森林学会大会学術講演集(CD−ROM)  118th-  K09  -288  2007/04/01  [Not refereed][Not invited]
  • 高橋信行, 斎藤秀之, 榊原均, 小嶋美紀子, 澁谷正人  日本森林学会大会学術講演集(CD−ROM)  118th-  D15  2007/04/01  [Not refereed][Not invited]
  • ChangSeob Shin, Masato Shibuya  JOURNAL OF FOREST RESEARCH  12-  (1)  57  -62  2007/02  [Not refereed][Not invited]
     
    To study spatial variation in natural tree seedling density and the relationship between variation in seedling density and seed dispersal mode at a cleared site, we surveyed natural tree seedlings after the site preparation for planting in a coniferous plantation cleared by a typhoon disturbance in 2004. The site was located near Sikotsuko Lake, Hokkaido, northern Japan. Twenty-five tree seedling species were found and the mean seedling density was 9.8 seedlings/m(2). Seedlings of non-animal-dispersed species (7.2 seedlings/m(2)) were approximately five times more abundant than those of animal-dispersed species (1.4 seedlings/m(2)), and 87% of all seedlings were current. The seedling density of non-animal-dispersed species (almost all wind-dispersed) decreased with distance from a natural forest; however, this trend did not hold for animal-dispersed species (almost all bird-dispersed). The spatial variation in seedling density was lower in animal-dispersed species than in non-animal-dispersed species. Seed dispersal patterns and the viability duration of buried seeds likely affected the variation in seedling density by seed dispersal mode.
  • Masato Shibuya, Takashi Yajima, Mihoko Yoshida, Eiji Sasaoka  ECOLOGICAL RESEARCH  22-  (1)  177  -182  2007/01  [Not refereed][Not invited]
     
    We have compared biomass-allocation patterns and frequency of sprouting among saplings of four tree species (Larix kaempferi, Betula platyphylla var. japonica, Populus maximowiczii, and Populus sieboldii) growing on a volcanic mountain in Hokkaido, northern Japan. Growing conditions were very harsh on the mountainside. Leaf mass and fine root mass relative to root mass were larger in L. kaempferi, and L. kaempferi root mass was less than for the other species. Sprouting ratios were high for the broadleaved species. Different allometries and sprouting ratios among species suggest that survival strategies for L. kaempferi were different from those for the broadleaved species. L. kaempferi has greater ability to increase leaf mass under harsh growing conditions; this probably results in large photosynthetic production by L. kaempferi on the volcano. In contrast, the two Populus species and Betula platyphylla seem to maintain populations through their ability to produce sprouts from large root systems.
  • 高橋信行, 斎藤秀之, 渋谷正人, 高橋邦秀  日本森林学会大会学術講演集(CD−ROM)  117th-  B23  2006/04/03  [Not refereed][Not invited]
  • 飯島勇人, 渋谷正人, 斎藤秀之, 高橋邦秀  日本森林学会大会学術講演集(CD−ROM)  117th-  PC48  2006/04/03  [Not refereed][Not invited]
  • 城田徹央, 斎藤秀之, アヤル マキシモフ, アレキサンダー コノノフ, アレキサンダー イサエフ, トロフィン マキシモフ, 渋谷正人, 高橋邦秀  日本生態学会大会講演要旨集  53rd-  173  2006/03/24  [Not refereed][Not invited]
  • H Iijima, M Shibuya, H Saito, K Takahashi  CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE  36-  (3)  664  -670  2006/03  [Not refereed][Not invited]
     
    We examined whether fallen logs without moss (FLB) are more drought-stressful sites for Picea jezoensis Carr. seedlings than are logs with moss (FLM) and whether drought affects the mortality of seedlings on logs. We measured the water potential of the log humus layer (Psi(H)) and needles of seedlings on the logs (Psi(N)) in a natural forest and a greenhouse under various drought conditions. We also determined the critical Psi(N) from the relationship between seedling mortality, Psi(N), and chlorophyll fluorescence, Fv/Fm. The Psi(H) on both moss-covered and bare logs in the forest was 0 MPa, regardless of the number of days without precipitation. In the forest, the mean predawn Psi(N) of FLB and FLM measured 11 days after a rainfall was -0.8 and -0.7 MPa, respectively, in the driest season. The Psi(N) for P. jezoensis seedlings of FLB reached the critical value earlier than those of FLM in the greenhouse, but this occurred after a long period (> 30 days) with no irrigation. We conclude that drought does not cause mortality of P. jezoensis seedlings on fallen logs in natural forests.
  • 城田徹央, 城田徹央, 斎藤秀之, 飯村佳代, 渋谷正人, 高橋邦秀  北海道の林木育種  48-  (2)  9-12  2006/01/25  [Not refereed][Not invited]
  • Mean-dominant height relationships for Scotch pine and Austrian black pine plantations in Bulgaria
    Stankova, T, Stankov, H, Shibuya, M  Ecological Engineering and Environmental Protection  2-  59  -66  2006  [Not refereed][Not invited]
  • Hanada N., Shibuya H., Saito H., Takahashi K.  JOURNAL OF THE JAPANESE FORESTRY SOCIETY  88-  (1)  1  -7  2006  [Not refereed][Not invited]
     
    To examine the regeneration process of broadleaved trees in planted larch (Larix kaempferi) forests, we investigated stand structures, species compositions and age distributions of broadleaved trees related to thinning histories, and species compositions of buried viable seeds in six planted larch forests located in the southern part of the Ishikari lowlands in Hokkaido, northern Japan. Density of broadleaved trees was lower in planted larch forests with dense sasa (Sasa spp.), and it was assumed that sasa inhibited the regeneration of broadleaved trees in planted larch forests. It was also assumed that thinning positively influenced the regeneration of broadleaved trees in the plantations, because the density of the trees increased after thinning. The number of species of broadleaved trees stepwise with thinning, and especially, the number of gap-dependent species markedly increased after the first thinning in the planted larch forests. Species composition of buried viable seeds was not similar to species composition of broadleaved trees. It was guessed that the seeds contributed little to the regeneration of broadleaved trees in planted larch forests, and yet more detailed examination of buried viable seeds in will be needed. Consequently, it was concluded that sasa negatively influenced the regeneration of broadleaved trees, and that thinning increased both density and species diversity of the trees in planted larch forests. Furthermore, it was suggested that the timing of the regeneration and species composition of broadleaved trees in planted larch forests are closely related to regeneration habits of the trees.
  • 飯島隼人, 渋谷正人, 斉藤秀之, 高橋邦秀  北方林業  57-  (10)  230-232  2005/10/01  [Not refereed][Not invited]
  • 飯島 勇人, 渋谷 正人, 斎藤 秀之  北方林業  57-  (9)  201  -203  2005/09
  • 大沼直樹, 渋谷正人, 矢島崇, 斉藤秀之, 高橋邦秀  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA044  2005/03/20  [Not refereed][Not invited]
  • 稲垣郁, 渋谷正人, 高橋邦秀, 斎藤秀之  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA087  2005/03/20  [Not refereed][Not invited]
  • 飯島勇人, 渋谷正人, 斎藤秀之, 高橋邦秀  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA103  2005/03/20  [Not refereed][Not invited]
  • 関根加奈子, 渋谷正人, 夏目俊二, 高橋邦秀, 斎藤秀之  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA089  2005/03/20  [Not refereed][Not invited]
  • 小森弘基, 斎藤秀之, 城田徹央, 渋谷正人, マキシモフ TC, 高橋邦秀  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA131  2005/03/20  [Not refereed][Not invited]
  • 斎藤秀之, 今のりえ, 船田良, 渋谷正人, 高橋邦秀  日本森林学会大会講演要旨集(CD−ROM)  116th-  3A28  2005/03/20  [Not refereed][Not invited]
  • 高池太二, 斎藤秀之, 小森弘基, 城田徹央, 渋谷正人, 高橋邦秀  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA132  2005/03/20  [Not refereed][Not invited]
  • 渋谷正人, 稲垣郁, 高橋邦秀, 斎藤秀之  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA088  2005/03/20  [Not refereed][Not invited]
  • ちょう慧卿, 高橋邦秀, 渋谷正人, 斎藤秀之, 金鍾真, 洪性かく, 金東遠  日本森林学会大会講演要旨集(CD−ROM)  116th-  PA032  2005/03/20  [Not refereed][Not invited]
  • M Shibuya, H Hasaba, T Yajima, K Takahashi  JOURNAL OF FOREST RESEARCH  10-  (1)  15  -20  2005/02  [Not refereed][Not invited]
     
    We tested the effects of thinning on allometry and needle-age distribution in natural stands of Abies sachalinensis Masters by comparing a thinned stand to an unthinned, control stand. Specifically, we attempted to clarify how allometry was altered after a thinning. We assumed that the needle-age distribution of trees in the thinned stand would show a younger composition than in the control stand, given the effect of improved light conditions on needle dynamics following a thinning. These investigations were conducted in dense Abies stands located in central Hokkaido, northern Japan, 19 years post-thinning. In the thinned stand, the ratio of individual needle mass to stem mass increased significantly, as compared to the control. A difference in the H-DBH relationship between the stands was probably related to this tendency. Mean needle age of trees differed significantly between the two stands, and the thinned stand showed a younger needle age than the control. Within each stand, dominant trees showed older mean needle age than codominant or suppressed trees. These tendencies may have been caused by differential needle dynamics affected by light conditions in the stands, and by different crown positions among the trees within a stand. In summary, trees in the thinned stand showed increased growth rates after thinning, which were caused by increased needle mass, younger composition of needles, and improved light conditions.
  • 趙 慧卿, 高橋邦秀, 渋谷正人, 斎藤秀之, 金 鍾眞, 洪 性珏  日本森林学会誌  87-  (6)  465  -470  2005  [Not refereed][Not invited]
     
    韓国の固有樹種で絶滅が危惧されているサイシウモミ(Abieskoreana)の天然更新にとって重要な種子の発芽特性を調べるため,発芽に対する低温湿層,温度,乾燥の影響について検討し,天然更新が比較的容易とされるトドマツ(Abies sachalinensis)と比較した。2樹種の種子は30~150日低温湿層処理によって発芽速度,発芽率が上昇した。150日間の低温湿層処理では,10~30°Cの各温度条件における最終発芽率は,無処理種子に比べ,サイシウモミで1.7~8.5倍(42.9~87.8%),トドマツで2.1~9.2倍(72.1~89.8%)まで増加した。しかし,サイシウモミの発芽速度はトドマツに比べ遅く,最終発芽率に達するのに各発芽温度で40日前後を要した。低温湿層処理後の発芽率の増加率は処理日数と温度によって異なっていた。低温湿層処理は,低温での発芽率を著しく増大させたが,サイシウモミではトドマツより長期間の低温湿層処理が必要であった。低温湿層処理後6日間までの無給水処理は発芽率に影響しなかった。しかし,PEG(Polyethylene glycol)6000溶液による乾燥処理によってサイシウモミの発芽率は有意に低下し,-0.4MPaでも無処理種子の50%まで低下した。一方,トドマツでは-0.8MPaでも無処理種子の80%を維持した。サイシウモミ種子はトドマツ種子に比べ,乾燥ストレスに影響されやすいが,発芽期間がトドマツより長く,晩霜害などによる被害を回避しやすいと推察された。
  • M Shibuya, N Haga, T Sasaki, S Kikuchi, M Haruki, M Noda, K Takahashi, K Matsuda  ECOLOGICAL RESEARCH  19-  (3)  301  -309  2004/05  [Not refereed][Not invited]
     
    Stand dynamics and self-thinning were analyzed in relation to the dynamics of above-ground biomass in natural Abies sachalinensis stands growing on sand dunes in northern Hokkaido, Japan. This was done in order to examine wave-type regeneration in the stands. Fifty-two plots were established in almost pure Abies stands that ranged from saplings to the mature and collapsing growth stages. Above-ground biomass and tree height reached asymptotic levels prior to the collapsing phase, unlike wave-regeneration Abies stands in central Japan and North America. Stand density was high in the young growth stages, but the self-thinning rate, that is, the density decrease per biomass growth in the study stands was greater than in wave-regeneration stands in central Japan, as indicated by a large self-thinning exponent (-1.26 by reduced major axis regression). The range of tree height distribution was very narrow, and the stands' vertical structure was typically single-layered. The slenderness ratio of trees was large, except in young stands. In mature and collapsing stands, advanced seedling density increased markedly. These stand and tree characteristics were considered to be correlated with the wave-type regeneration in the study stands, and it is assumed that prevailing winds affect tree mortality.
  • 渋谷正人, 花田尚子, 斉藤秀之, 高橋邦秀  北方林業  56-  (5)  113-116  2004/05/01  [Not refereed][Not invited]
  • ちょう慧卿, 高橋邦秀, 渋谷正人, 斎藤秀之, 金鍾真, 洪性かく  日本林学会大会学術講演集  115th-  667  2004/03/20  [Not refereed][Not invited]
  • 飯島勇人, 斎藤秀之, 渋谷正人, 高橋邦秀  日本林学会大会学術講演集  115th-  406  2004/03/20  [Not refereed][Not invited]
  • CHO H K, 高橋邦秀, 渋谷正人, 斎藤秀之, KIM J J, HONG S G  日本林学会北海道支部論文集  (52)  90-92  2004/02/01  [Not refereed][Not invited]
  • 飯島勇人, 渋谷正人, 斎藤秀之, 高橋邦秀  日本林学会誌  86-  (4)  358  -364  2004  [Not refereed][Not invited]
     
    抄録:倒木上のコケの高さがエゾマツ実生の生残と成長に与える影響を明らかにするため、 コケがない倒木 (FLB)、 コケが低い倒木 (FLS)、 コケが高い倒木 (FLT) を対象に播種実験を行い、 エゾマツ実生の発芽率と生残率、形態ならびに根の分布、 各器官重を調査した。発芽率はFLTで有意に小さく、 生残率は倒木間で差がみられなかった。コケの高さや実生の生残・枯死によらず、 実生の主根の大部分は腐植層や材部に分布していた。当年生実生の個体重はFLT上で最も小さかったが、 FLT上の実生は他の倒木の実生より幹が長く、 幹へ多くの器官量配分を行っており、 高いコケによる被陰に対し形態および器官量配分による順応を行っていたと考えられた。1年生実生の個体重はFLSよりFLB上の実生が小さかった。FLB上の1年生実生の根長が有意に短く、 T/Rが高かったことから、 FLBでは1年生時の根の伸長が制限され、 個体の成長が抑制されたと考えられた。エゾマツの発芽および定着にはFLSが適していると考えられた。Abstract:We surveyed the germination and survival rates, morphological characteristics, spatial pattern of root extension, and the mass distribution into each organ of current and 1-year-old Picea jezoensis seedlings growing on fallen logs with no moss (FLB), short moss (FLS), and tall moss (FLT) in a natural coniferous forest in central Hokkaido, northern Japan, in order to estimate the in FLUence of moss height on the establishment of P. jezoensis seedlings on fallen logs. The germination rate was significantly lower on FLT than on the others. The survival rate of seedlings did not differ among the logs. Almost all parts of the tap roots of living and dead seedlings were distributed in the humus and wood layers of the logs, irrespective of moss height. Seedlings on FLT had longer stems and greater stem masses than seedlings on the other logs, which indicated their morphologic and allometric acclimation to shading from the tall moss. The masses of individual current-year seedlings were lower on FLT than on the others. The masses of individual 1-year-old seedlings were lower on FLB than on FLS. The root extension of 1-year-old seedlings on FLB was inhibited and resulted in shorter roots and a higher T/R ratio. Consequently, the growth of 1-year-old seedlings on FLB was inhibited. Therefore, FLS is the most suitable for the establishment of P. jezoensis seedlings.
  • SHIBUYA Masato, SAITO Hideyuki, SAWAMOTO Takuji, HATANO Ryusuke, YAJIMA Takashi, TAKAHASHI Kunihide, CHA Joo Young, ISAEV Alexander P., MAXIMOV Trofim C.  Eurasian Journal of Forest Research  7-  (2)  67  -74  2004  [Not refereed][Not invited]
     
    Article
  • T Stankova, M Shibuya  FOREST ECOLOGY AND MANAGEMENT  186-  (1-3)  7  -20  2003/12  [Not refereed][Not invited]
     
    This study developed adaptation for practical application of Hagihara's competition-density (C-D) theory and examined the derived model with data of natural birch (Betula platyphylla var. japonica and Betula ermanii) stands in northeastern Japan. Stand mean height was introduced into the theory as an indicator of stand growth stage instead of stand age, and the theory adaptation started from expressing the coefficients A, and B of the reciprocal equation of the C-D effect in self-thinning stands (i.e. 1/w = A(t)rho + B, where w and p represent mean plant mass and density, respectively) through the mean height class. Parameter B was approximated closely by a power function of stand mean height class over all growth stages examined. Parameter A, in the equation decreased rapidly with increasing mean height, approaching a constant value, and was approximated by a function of mean height class, which was the difference between two power functions involving several hidden growth parameters of C-D theory. Our results approximated well the relationship between mean tree weight and density of stands grouped into 2 m mean height classes for both birch species. The parameters in the regressions of A, and B were used to express and to evaluate the principal growth parameters of the stands, such as mortality rate, self-thinning exponent, biological time, and asymptotic stand density, and their changes with stand growth are discussed for the birch stands. Furthermore, self-thinning lines for both species were determined theoretically, not empirically, using some of the parameters in the regression of A, and estimates of the asymptotic stand density. The evaluated lines fitted the upper boundaries of the mean tree weight-density relationship of each species well. (C) 2003 Elsevier B.V. All rights reserved.
  • T Sawamoto, R Hatano, M Shibuya, K Takahashi, AP Isaev, RV Desyatkin, TC Maximov  SOIL SCIENCE AND PLANT NUTRITION  49-  (4)  493  -501  2003/08  [Not refereed][Not invited]
     
    Boreal and Taiga forests in Russia play an important role in carbon storage in terrestrial ecosystems. In this region, forest fires often occur, which affect considerably carbon cycling in the Taiga ecosystems. We estimated the net ecosystem production (NEP) in five ecosystems with different histories of forest fire in Yakutsk, Russia. The NEP was calculated as the difference between the net primary production (NPP) and annual soil organic matter decomposition (OMD). Severe burning and forest regeneration strongly affected OMD, NPP, and NEP. The NEP values were +1.24 and +1.40 Mg C ha(-1) year(-1) in two intact larch forests. But, the NEP values decreased to -0.89 and +0.07 Mg C ha(-1) year(-1) at two sites burned 5 years before. However, NEP showed the highest value, +2.39 Mg C ha(-1) year(-1), in a young larch forest burned 25 years before. The changes in NPP were considered to be a predominant factor for the changes in NEP in this region. Further studies should be carried out to analyze and/or estimate the changes in NPP after forest fire in relation to NEP in this region.
  • 渋谷正人, 斎藤秀之, 波多野隆介, 森下智陽, 永田修, 高橋邦秀  食生活科学・文化及び地球環境科学に関する研究助成研究紀要  16-  95  -102  2003/05  [Not refereed][Not invited]
  • 飯島勇人, 斎藤秀之, 渋谷正人, 田内裕之, 高橋邦秀  日本林学会大会学術講演集  114th-  74  2003/03/20  [Not refereed][Not invited]
  • 沢栗浩明, 斎藤秀之, 渋谷正人, 高橋邦秀, 河原孝行  日本林学会大会学術講演集  114th-  740  2003/03/20  [Not refereed][Not invited]
  • 小森弘基, 斎藤秀之, 渋谷正人, 高橋邦秀, 門松昌彦, 生方正俊, 星比呂志  日本林学会大会学術講演集  114th-  736  2003/03/20  [Not refereed][Not invited]
  • 松井崇史, 田保史明, 斎藤秀之, 渋谷正人, 高橋邦秀  日本林学会大会学術講演集  114th-  664  2003/03/20  [Not refereed][Not invited]
  • 鈴木雅博, 渋谷正人, 斎藤秀之, 高橋邦秀  日本林学会北海道支部論文集  (51)  70-72  2003/02/01  [Not refereed][Not invited]
  • 矢野慶介, 高橋邦秀, 渋谷正人, 斎藤秀之  日本生態学会大会講演要旨集  49th-  151  2002/03/25  [Not refereed][Not invited]
  • 山室晃司, 斎藤秀之, 渋谷正人, 高橋邦秀, 尾崎研一  日本生態学会大会講演要旨集  49th-  227  2002/03/25  [Not refereed][Not invited]
  • 渋谷正人, 斎藤秀之, 波多野隆介, 高橋邦秀  日本林学会大会学術講演集  113th-  48  2002/03/20  [Not refereed][Not invited]
  • A method for density control of forest plantations
    Stankova, T, Shibuya, M, Hagihara, A  Hayka Зa Гopata  2-  27  -38  2002  [Not refereed][Not invited]
  • Matsuda Kyo, Shibuya Masato, Koike Takayoshi  Eurasian Journal of Forest Research  5-  (2)  119  -130  2002  [Not refereed][Not invited]
     
    Article
  • 渋谷正人, 津野雄一, 斎藤秀之, 矢島崇, 高橋邦秀, 澤本卓治, 波多野隆介, 車柱栄, Isaev AP, Maximov TC  北方林業  53-  (10)  232  -234  2001/10  [Not refereed][Not invited]
  • 渋谷正人, 津野雄一, 斎藤秀之, 矢島崇, 高橋邦秀, 澤本卓治, 波多野隆介, 車柱栄, Isaev AP, Maximov TC  北方林業  53-  (9)  193  -196  2001/09  [Not refereed][Not invited]
  • 永田修, 波多野隆介, 渋谷正人, 斎藤秀之, 高橋邦秀, KONDRASHOV L  日本土壌肥料学会講演要旨集  47-  302  2001/03/25  [Not refereed][Not invited]
  • 津野雄一, 高橋邦秀, 渋谷正人, 斎藤秀之  日本林学会大会学術講演集  112th-  583  2001/03/20  [Not refereed][Not invited]
  • 日比野梓織, 門松昌彦, 斎藤秀之, 渋谷正人, 玉井裕, 高橋邦秀  日本林学会大会学術講演集  112th-  622  2001/03/20  [Not refereed][Not invited]
  • 馬場久美子, 斎藤秀之, 高橋邦秀, 渋谷正人, 生方正俊, 河野耕蔵  日本林学会大会学術講演集  112th-  666  2001/03/20  [Not refereed][Not invited]
  • 山室晃司, 斎藤秀之, 渋谷正人, 高橋邦秀, 尾崎研一  日本林学会大会学術講演集  112th-  473  2001/03/20  [Not refereed][Not invited]
  • MICHIHIRO Jun, SHIBUYA Masato, YAJIMA Takashi, TAKAHASHI Kunihide  Transactions of the Meeting in Hokkaido Branch of the Japanese Forestry Society  (49)  12  -14  2001/02/22
  • CO2, N2O, CH4 fluxes from soil in Siberian-taiga larch forests with different histories of forest fire
    Sawamoto, T, Hatano, R, Shibuya, M, Takahashi, K, Isaev, A.P, Desyatkin, R.M  Tôhoku Geophysical Journal  36-  77  -89  2001  [Not refereed][Not invited]
  • SIBUYA Masato, SUGIURA Tetsuya, TAKAHASHI KUnihide, SAWAMOTO Takuji, HATANO Ryusuke, CHA Joo Young, FUKUYAMA Kenji, ISAEV AlexanderP, MAXIMOV TrofimCithozone Russian Academy of Science  Eurasian journal of forest research  2-  39  -44  2001  [Not refereed][Not invited]
     
    Article
  • 野口千絵子, 門松昌彦, 玉井裕, 渋谷正人, 斎藤秀之, 高橋邦秀  日本林学会大会学術講演集  111th-  248  2000/03/30  [Not refereed][Not invited]
  • SASAOKA Eiji, YOSHIDA Mihoko, YAJIMA Takashi, SHIBUYA Masato, TAKAHASHI Kunihide  Research bulletins of the College Experiment Forests, Hokkaido University  57-  (2)  105  -112  2000  [Not refereed][Not invited]
  • KURAHASHI Yoshiyuki, SHIBUYA Masato, YAJIMA Takashi, MATSUDA Kyo  Research bulletins of the College Experiment Forests, Hokkaido University  56-  (1)  55  -69  1999/02/26
  • MATSUDA Kyo, YAJIMA Takashi, SHIBUYA Masato  Journal of the Japanese Association of Snow and Ice  61-  (2)  139  -147  1999  [Not refereed][Not invited]
     
    Tree saplings were planted in 1977 on a slope covered by Sasa bamboo in the Teshio Experiment Forest of Hokkaido University to prevent snow avalanches occuring every year and to restore the natural landscape of the slope. Before the planting, Sasa densely covering the slope was pruned away and short wood stakes were rammed in the upper part of the slope, and saplings of Abies, Picea and two species of Larix were planted in the slope. Then the slope was protected from snow avalanches in the following years, probably by effects of sasa-clearing and wood stakes, and the growth of saplings resulted in the reestablishment of a forest stand. After 19 years of the planting, mean heights of Larix, Abies and Picea attained 12, 7 and 4 m, respectively. Avalanches on the slope never occurred from 1978 to the present. Natural broad-leaved trees such as Quercus and Tilia species, which were inhibited their growth by the avalanche, also regained vigorous growth and attained their maximum height over 7 m. Present small patches on the slope are mixed stands of conifers and braodleaved trees. An overall discussion is given on the introduction method of trees to the slope with deep snow, especially from aspects of landscape restoration and expected costs.
  • 日本林学会誌  81-  (1)  22  -28  1999  [Not refereed][Not invited]
  • Kyo MATSUDA, Takashi YAJIMA, Masato SHIBUYA  Seppyo  61-  (2)  139  -147  1999  [Not refereed][Not invited]
  • E. Sasaoka, T. Yajima, M. Shibuya, K. Takahashi, F. Nakamura, O. Shimizu  Journal of the Japanese Forestry Society  81-  (1)  22  -28  1999  [Not refereed][Not invited]
     
    We studied distribution, stand structure and transition of stand structure by altitude of a naturally regenerated Larix kaempferi stand on Mt. Komagatake, a volcano on the island of Hokkaido. L. kaempferi dominated at altitudes from 200 to 1,000 m above sea level, although broadleaved trees dominated at the foot of the mountain. The stands on the mountain were composed of L. kaempferi, Betula spp., and Populus maximowiczii, and asortment of others. At 500 m a. s l., the stand dominant height was 2.0 to 6.1 m and basal area at ground level was 0.1 to 7.8 m2/ ha. These values indicate that the stand had intensively restricted growth. The stands at higher altitudes were less developed than at lower altitudes in dominant height and basal area at ground level. The present L. kaempferi gradually started being established in the area between 500 to 700 m a. s. l. during 20 to 50 years after the eruption in 1929. Thereafter the number of the established L. kaempferi increased remarkably. We believed that seed dispersal from artificial forests of L. kaempferi that have been planted since 20 years after the eruption, and from the individuals that had invaded the stands in the very early period, contributed to the increase of naturally regenerated L. kaempferi trees.
  • GT Yang, JY Cha, M Shibuya, T Yajima, K Takahashi  MYCOLOGICAL RESEARCH  102-  (12)  1503  -1508  1998/12  [Not refereed][Not invited]
     
    Larix kaempferi seedlings, in the process of becoming established during the revegetation process following a volcanic eruption, were assessed far the types, occurrence patterns and diversity of their ectomycorrhizas along an elevation gradient. On the basis of macro- and microscopic characteristics, 12 types of ectomycorrhizas were classified. In general, ectomycorrhizal types differed more by site than by seedling age. The majority of root systems of seedlings with an age ranging from 1 to 5 years were colonized by I or 2 types of mycorrhizal fungi at low and intermediate elevations, 2 or 3 types at a higher elevation. Under the more stressed environments of high and intermediate elevations, the mean D.W, of I yr old seedlings, 40% of which were colonized by 3 or 4 mycorrhizal fungi, was double the weight of the same aged seedlings at lower elevation sites, only 10% of which were colonized by 3 or 4 mycorrhizal fungi. The correspondence between the type and frequency of mycorrhizas, the elevation gradient and litter accumulation suggests that change in litter accumulation along gradient may influence not only mycorrhizal types and their occurrence, but also the diversity of mycorrhizas on one seedling. Diversity of mycorrhizas on the same seedling is assumed to be critical for the establishment of seedlings from the very beginning on stressed sites, and may also be influenced by the availability of nutrients. The more intensive competition between mycorrhizas that occurs due to a reduction in the food source (tip roots) shared by the mycorrhizal fungi with similar resource requirements, results in frequent co-occurrence of mycorrhizas in the same root system or even the same root tip. As a result, the diversity of mycorrhizal types seems to become simplified as the seedlings age.
  • Sakabe Tomoko, Yabe Tuneaki, Yajima Takashi, Shibuya Masato, Takahashi Kunihide  Research bulletins of the College Experiment Forests, Hokkaido University  55-  (1)  113  -122  1998/02
  • Cha Joo Young, Shibuya Masato, Yajima Takashi, Takahashi Kunihide, Igarashi Tsuneo  Research bulletins of the College Experiment Forests, Hokkaido University  54-  (2)  212  -222  1997/09
  • 矢島 崇, 渡辺 訓男, 渋谷 正人  日本林学会誌  79-  (4)  234  -238  1997  [Not refereed][Not invited]
     
    抄録:ササ群落の稈高が連続的に変化する場所において、稈基繁殖型であるチシマザサと地下茎繁殖型であるクマイザサを対象とし、稈枝•葉•地下茎•稈基などの器官量の稈高にともなう変化について明らかにした。また器官量間の関係を両種で比較して、稈高が制限されるような場所での両種の形態の可塑性を検討した。調査区の平均稈高はチシマザサでは59~261cmでクマイザサでは30~107cmであり、斜面上部ほど低かった。両種とも、稈高が制限されると稈枝と葉が小型化することによって地上部現存量が減少したが、稈密度や分枝特性、稈寿命、単位面積当りの葉枚数はあまり変化しなかった。クマイザサは稈高が低下してもC/F比とT/R比に大きな変化がなく、各器官がほぼ同じ比率で小型化していた。チシマザサは稈高の低下にともなって特に稈枝量の減少が大きく、C/F比が小さくなった。地下部では稈高の低下にともなって稈基量が減少したが地下茎は長くなり節数が増えて地下茎量は相対的に増加しT/R比が低下していた。稈高が制限されるような場所での両種の形態変化には明らかな差異が認められた。Abstract:The biomass of above- and under-ground parts were studied in stands of bamboo grass, Sasa kurilensis and Sasa senanensis, with different stand heights to compare their plastic variation of mass allocation between organs depending on the culm height. The mean stand heights were 59261 cm in S. kurilensis plots, and 30107 cm in S. senanensis plots. Mean stand height reduced distinctly toward the upper part of hillside. The stand height of bamboo grass might be affected by stress such as high wind or thin snow. The above-ground biomass decreased, and culms, branches and leaves became smaller where mean culm height was limited. Whereas culm density, branching pattern, mean life span of culm and the number of leaves per m2 did not change as much in both species. S. senanensis showed small changes in the C/F ratio and T/R ratio with culm height, and its mass allocation between organs was rather stable irrespective of culm height. S. kurilensis showed obvious changes in organ allocation with a reduction of culm height. In S. kurilensis, the mass of culm and branch decreased significantly and rhizome mass increased relatively in under-ground parts because the culm base mass had reduced with decreased culm height.
  • 渋谷 正人, 矢島 崇, 川合 由香, 渡辺 訓男, 西川 功  日本林学会誌  79-  (4)  195  -201  1997  [Not refereed][Not invited]
     
    抄録:1954年の15号台風により大規模な攪乱を受けた林分に設定された固定調査区(0.25ha)において、風害後40年間の林分の回復過程と、主要樹種の幹数動態について検討した。胸高断面積合計値は風害前の推定値の86%となり、林分レベルでの量的な回復は風害後40年間で進んでいるが、樹種構成やサイズ分布などの質的な面での回復にはまだ長期間が必要と考えられた。風害後に樹種数は増加したが、現在幹数が多い樹種は風害以前と類似していて、林分の回復は風害以前に分布していた樹種が中心となっていた。おもな樹種の風害前後および風害後の幹数動態は樹種によって異なる傾向があり、3タイプに区分された。しかし、それぞれのタイプには、種子による更新特性や耐陰性が異なる樹種が含まれ、このことは大規模攪乱の場合の特徴と考えられた。さらに本調査地では、樹種による萠芽性の違いが幹数動態に影響していると推察され、種子更新以外の更新特性も考慮する必要性が指摘された。Abstract:Stand recovering process and dynamics of the number of stems of major tree species in 40 years after a large-scale disturbance by a typhoon in 1954 were monitored in a permanent plot (0.25 ha) in a deciduous broadleaved stand. The basal area in 1994 was restored to up to 86 % of the estimated basal area before the disturbance, but tree species composition and DBH distribution in 1994 differed from those before the disturbance. Forty years is not considered to be sufficient to reconstruct stand structure and species composition. The number of tree species increased after the disturbance, however, the predominant tree species in 1994 were similar to those before the disturbance and they contributed significantly to stand recovery. Major tree species in 1994 were classified into 3 types, depending on their dynamics of the number of stems through and after the disturbance. It seemed to be a characteristic of stand recovery after a large-scale disturbance that tree species with various behaviors of seed germination and shade tolerance were put together in a given species group in the classification. Since vegetative regeneration, such as sprouting, is assumed to be important in this stand's recovery from the disturbance, regeneration behaviors other than seeding need to be taken into account as regeneration sources of tree species.
  • シラカンバ林の密度管理図-成長にともなう平均材積-密度関係の推移にもとづく密度管理図の修正-
    北海道大学農学部演習林研究報告  54-  (2)  202  -211  1997  [Not refereed][Not invited]
  • 矢島 崇, 渡辺 訓男, 渋谷 正人  Journal of the Japanese Forestry Society  79-  (4)  234  -238  1997  [Not refereed][Not invited]
     
    抄録:ササ群落の稈高が連続的に変化する場所において、稈基繁殖型であるチシマザサと地下茎繁殖型であるクマイザサを対象とし、稈枝•葉•地下茎•稈基などの器官量の稈高にともなう変化について明らかにした。また器官量間の関係を両種で比較して、稈高が制限されるような場所での両種の形態の可塑性を検討した。調査区の平均稈高はチシマザサでは59~261cmでクマイザサでは30~107cmであり、斜面上部ほど低かった。両種とも、稈高が制限されると稈枝と葉が小型化することによって地上部現存量が減少したが、稈密度や分枝特性、稈寿命、単位面積当りの葉枚数はあまり変化しなかった。クマイザサは稈高が低下してもC/F比とT/R比に大きな変化がなく、各器官がほぼ同じ比率で小型化していた。チシマザサは稈高の低下にともなって特に稈枝量の減少が大きく、C/F比が小さくなった。地下部では稈高の低下にともなって稈基量が減少したが地下茎は長くなり節数が増えて地下茎量は相対的に増加しT/R比が低下していた。稈高が制限されるような場所での両種の形態変化には明らかな差異が認められた。Abstract:The biomass of above- and under-ground parts were studied in stands of bamboo grass, Sasa kurilensis and Sasa senanensis, with different stand heights to compare their plastic variation of mass allocation between organs depending on the culm height. The mean stand heights were 59261 cm in S. kurilensis plots, and 30107 cm in S. senanensis plots. Mean stand height reduced distinctly toward the upper part of hillside. The stand height of bamboo grass might be affected by stress such as high wind or thin snow. The above-ground biomass decreased, and culms, branches and leaves became smaller where mean culm height was limited. Whereas culm density, branching pattern, mean life span of culm and the number of leaves per m2 did not change as much in both species. S. senanensis showed small changes in the C/F ratio and T/R ratio with culm height, and its mass allocation between organs was rather stable irrespective of culm height. S. kurilensis showed obvious changes in organ allocation with a reduction of culm height. In S. kurilensis, the mass of culm and branch decreased significantly and rhizome mass increased relatively in under-ground parts because the culm base mass had reduced with decreased culm height.
  • 渋谷 正人, 矢島 崇, 川合 由香, 渡辺 訓男, 西川 功  Journal of the Japanese Forestry Society  79-  (4)  195  -201  1997  [Not refereed][Not invited]
     
    抄録:1954年の15号台風により大規模な攪乱を受けた林分に設定された固定調査区(0.25ha)において、風害後40年間の林分の回復過程と、主要樹種の幹数動態について検討した。胸高断面積合計値は風害前の推定値の86%となり、林分レベルでの量的な回復は風害後40年間で進んでいるが、樹種構成やサイズ分布などの質的な面での回復にはまだ長期間が必要と考えられた。風害後に樹種数は増加したが、現在幹数が多い樹種は風害以前と類似していて、林分の回復は風害以前に分布していた樹種が中心となっていた。おもな樹種の風害前後および風害後の幹数動態は樹種によって異なる傾向があり、3タイプに区分された。しかし、それぞれのタイプには、種子による更新特性や耐陰性が異なる樹種が含まれ、このことは大規模攪乱の場合の特徴と考えられた。さらに本調査地では、樹種による萠芽性の違いが幹数動態に影響していると推察され、種子更新以外の更新特性も考慮する必要性が指摘された。Abstract:Stand recovering process and dynamics of the number of stems of major tree species in 40 years after a large-scale disturbance by a typhoon in 1954 were monitored in a permanent plot (0.25 ha) in a deciduous broadleaved stand. The basal area in 1994 was restored to up to 86 % of the estimated basal area before the disturbance, but tree species composition and DBH distribution in 1994 differed from those before the disturbance. Forty years is not considered to be sufficient to reconstruct stand structure and species composition. The number of tree species increased after the disturbance, however, the predominant tree species in 1994 were similar to those before the disturbance and they contributed significantly to stand recovery. Major tree species in 1994 were classified into 3 types, depending on their dynamics of the number of stems through and after the disturbance. It seemed to be a characteristic of stand recovery after a large-scale disturbance that tree species with various behaviors of seed germination and shade tolerance were put together in a given species group in the classification. Since vegetative regeneration, such as sprouting, is assumed to be important in this stand's recovery from the disturbance, regeneration behaviors other than seeding need to be taken into account as regeneration sources of tree species.
  • SHIBUYA M.  Research Bulletin of the Hokkaido University Forests  54-  (2)  202  -211  1997  [Not refereed][Not invited]
  • SHIBUYA Masato, KOJIMA Yasuo, MATSUDA Kyo  Transactions of the Meeting in Hokkaido Branch of the Japanese Forestry Society  (44)  70  -72  1996/02/28
  • 内海 洋太, 渋谷 正人, 矢島 崇  日本林学会誌  78-  (4)  457  -460  1996  [Not refereed][Not invited]
     
    抄録:ヒノキアスナロの稚樹や伏条枝で頻度高く観察される側枝の先端部における枝条展開パタンの変化(芯形成)について、芯を形成する側枝のサイズ、芯形成の頻度、および側枝内における同化器官、非同化器官量の分布の特徴について検討し、芯形成の意味について考察した。調査した全側枝のうち29%で芯形成が生じていた。芯形成は、枝長が長くC/F比が高い低位置の側枝で多くみられた。また上位の側枝の葉量の多い箇所よりさらに樹冠の外側で芯形成が生じ、芯を形成した側枝では、葉量は芯から枝先端部分に集中し偏った分布をする傾向が認められた。これらのことから、芯形成は葉量を確保するという働きがあり、低照度下において個体あるいは側枝の生残に大きな役割を果たしているのではないかと推察された。さらに観察した伏条枝のうち95%で芯形成がみられたが、これは芯形成が着生位置の低い長い枝で生じることが多いためであると考えられた。Abstract:Branch length distribution, frequency of formational change in lateral branches, and foliage mass distribution in individual branches were examined for Thujopusis dolabrata var. hondae saplings to examine the ecological causes of the formational change in branches. Formational changes were observed in 29% of all lateral branches studied, and were more frequent in branches ramified at lower height. Lateral branches showing formational change were characterized by their longer length and high C/F ratio compared with branches with no formational changes. Foliage mass on branches having formational change showed a skewed distribution and were concentrated in peripheral shoots extending from the outer crown of the formational change. We hypothesize that the formational change provided the sufficient foliage mass for the survival of saplings and lateral branches in extremely low light. Most of the observed layerings (95%) showed formational change. However, this tendency is probably to be attributable to the fact that branches with formational changes tend to be longer and ramify at lower heights than those with no formational changes.
  • 内海 洋太, 渋谷 正人, 矢島 崇  Journal of Japanese forestry Society  78-  (4)  457  -460  1996  [Not refereed][Not invited]
     
    抄録:ヒノキアスナロの稚樹や伏条枝で頻度高く観察される側枝の先端部における枝条展開パタンの変化(芯形成)について、芯を形成する側枝のサイズ、芯形成の頻度、および側枝内における同化器官、非同化器官量の分布の特徴について検討し、芯形成の意味について考察した。調査した全側枝のうち29%で芯形成が生じていた。芯形成は、枝長が長くC/F比が高い低位置の側枝で多くみられた。また上位の側枝の葉量の多い箇所よりさらに樹冠の外側で芯形成が生じ、芯を形成した側枝では、葉量は芯から枝先端部分に集中し偏った分布をする傾向が認められた。これらのことから、芯形成は葉量を確保するという働きがあり、低照度下において個体あるいは側枝の生残に大きな役割を果たしているのではないかと推察された。さらに観察した伏条枝のうち95%で芯形成がみられたが、これは芯形成が着生位置の低い長い枝で生じることが多いためであると考えられた。Abstract:Branch length distribution, frequency of formational change in lateral branches, and foliage mass distribution in individual branches were examined for Thujopusis dolabrata var. hondae saplings to examine the ecological causes of the formational change in branches. Formational changes were observed in 29% of all lateral branches studied, and were more frequent in branches ramified at lower height. Lateral branches showing formational change were characterized by their longer length and high C/F ratio compared with branches with no formational changes. Foliage mass on branches having formational change showed a skewed distribution and were concentrated in peripheral shoots extending from the outer crown of the formational change. We hypothesize that the formational change provided the sufficient foliage mass for the survival of saplings and lateral branches in extremely low light. Most of the observed layerings (95%) showed formational change. However, this tendency is probably to be attributable to the fact that branches with formational changes tend to be longer and ramify at lower heights than those with no formational changes.
  • WATANABE Norio, YAJIMA Takashi, SHIBUYA Masato  Transactions of the Meeting in Hokkaido Branch of the Japanese Forestry Society  (43)  198  -199  1995/02/28
  • 日本林学会誌  77-  (3)  247  -253  1995  [Not refereed][Not invited]
  • Maria Catarina Megumi Kasuya, Tsuneo Igarashi, Masato Shibuya  Mycoscience  36-  (3)  335  -339  1995  [Not refereed][Not invited]
     
    Picea glehnii seedlings whose ages ranged from 2 to 5 years and which were growing in a P. glehnii-Abies sachalinensis natural forest where the surface had been scarified 6 years before, were assessed for the occurrence and types of ectomycorrhizae. Based on the macro- and microscopic characteristics, 34 types of ectomycorrhizae were classified. The basidiomycetes were clearly dominant and it was common to observe more than one type of mycorrhiza occurring in the same root tip. The diversity of mycorrhizal types and the presence of at least one type of ectomycorrhiza in a single seedling, observed in this work, indicate a very dynamic system of mycorrhizal formation in P. glehnii seedlings, which allows them to survive and grow in a forest surface subjected to soil scarification. © 1995, Mycological Society of Japan. All rights reserved.
  • SHIBUYA M.  Journal of the Japanese Forestry Society.  77-  (3)  247  -253  1995  [Not refereed][Not invited]
  • M Shibuya  ECOLOGICAL RESEARCH  9-  (3)  325  -332  1994/12  [Not refereed][Not invited]
     
    The competition-density effect for natural Japanese white birch (Betula platyphylla var. japonica) stands, located in the northern part of Hokkaido Island, was examined for various growth stages to establish mean tree weight-density relationships over a considerable extent of stand growth of white birch. Aboveground yields of investigated stands ranged from 16.0 to 161.7 t.ha(-1), and it was recognized that maximum aboveground yield of this species was about 160 t.ha(-1). Constants A and B of the reciprocal equation of the C-D effect, 1/w = AN + B (w, mean tree weight; N, tree density), were related to mean height classes of birch stands. Constant B was related to the entire mean height classes as the allometric relationship. On the other hand, constant A had an allometric relationship to mean height classes under 16 m, but became fixed over the 16 m class. White birch stands can come up to the maximum yield approximately at the stage of the 16 in class. The asymptotic tendency seemed to be appropriate for constant A-mean height class relationship. The maximum yield of white birch stands was predicted by the asymptotic value of A. The trend of mean tree weight-density relationships with stand growth also changed with constant A. It was considered that maximum yield was an important characteristic for practical applications of the C-D effect to agriculture and forestry.
  • SHIBUYA M  9-  (3)  325  -332  1994  [Not refereed][Not invited]
  • 渋谷 正人, 松田 彊  Research bulletin of the Hokkaido University Forests  50-  (2)  p207  -218  1993
  • SHIBUYA Masato  Journal of the Japanese Forestry Society  74-  (6)  509  -513  1992/11/01
  • Shibuya Masato  Japanese journal of neurosurgery  1-  (4)  313  -321  1992/10/20  
    Middle cerebral aneurysms can develop from a variety of locations but most aneurysms occur at M_1 bifurcation, although the origin of the anterior temporal artery, the lenticulostriate artery, and the area distal to the M_2 segments are also likely sites. There are two major surgical approaches to consider for an aneurysm at the M1 bifurcation : the proximal approach, which proceeds from the internal carotid, the M_1, and the bifurcation : and the distal approach, which proceeds from the M_2 directly to the M_1 bifurcation and the aneurysm. We use both approaches interchangeably, even in one patient, whichever was considered safer and less traumatic to the brain. Body clipping is a major surgical requirement for a wide-necked aneurysm, and a combination of the most suited multiple clips should be used on aneurysms with arterial branching. Temporary clips should be limited to cases of a premature aneurysmal rupture, or if an aneurysm appears imminent, or when puncturing the aneurysm to reduce its mass. In all instances, however, the brain must be protected before applying any temporary clip. Although early removal of the blood clot is the best way to prevent the occurrence of a vasospasm, it is impossible to surgically remove a clot sited deeply in the insular cistern. The intrathecal use of thrombolytic agents seems to be promising procedure, provided that their side effect (bleeding) can be controlled. However, no single drug treatment has been found successful. Thus, a combination of several drugs with different mechanisms of action may have to be used to abolish the vasospasm.
  • SHIBUYA Masato, IGARASHI Tsuneo  Jounrnal of the Japanese Forestry Society  74-  (2)  102  -108  1992  [Not refereed][Not invited]
  • ミズナラ二次林における間伐.枝打ちおよび地表処理の効果
    北海道農学部演習林報告  48-  (1)  1991  [Not refereed][Not invited]
  • 樹下植栽されたトドマツ人工林の成長と現存量
    北海道大学農学部演習林報告  48-  (2)  1991  [Not refereed][Not invited]
  • Tending effects of thinning, pruning and soil-exposure of the forest floor in natural secondary oak (Quercus mongolica var. grosseserrata) stands in Hokkaido
    The Research Bulletins of the College Experiment Forests  48-  (1)  1991  [Not refereed][Not invited]
  • Growth and biomass of an artificial todo-fir (Abies sachalinensis) stand planted in the natural broad-leaved forest
    The Research Bulletins of the College Experiment Forests  48-  (2)  1991  [Not refereed][Not invited]
  • ドマツ巣植え造林地における個体成長と根系について
    北海道大学農学部演習林報告  46-  (3)  1989  [Not refereed][Not invited]
  • Individual growth and roots distiribution in a todo-fir (Abies sachalinensis)stand planted in clumps
    The Research Bulletius of the College Experiment Forests.  46-  (3)  1989  [Not refereed][Not invited]
  • SHIBUYA Masato, KIKUZAWA Kihachiro  Transactions of the Meeting in Hokkaido Branch of the Japanese Forestry Society  (36)  124  -126  1988/03/01
  • トドマツ林分の齢構成と個体の生長経過について
    北海道大学農学部演習林報告  44-  (1)  1987  [Not refereed][Not invited]
  • Age distribution and individual growth pattern in todo fir (Abies sachalinensis)stands
    The Research Bulletins of the College Experiment Forests  44-  (1)  1987  [Not refereed][Not invited]

Research Grants & Projects

  • シベリアタイガ林の林分動態と山火事の影響
  • 林分内の個体間競争
  • Stand dyhamics of larch stands in Siberian taiga and effect of forest fire on their dynamics
  • Competition effect in forest stands.

Educational Activities

Teaching Experience

  • Inter-Graduate School Classes(General Subject):Natural and Applied Sciences
    開講年度 : 2021
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 生態系管理、流域保全、森林修復、自然資源政策、専門家、緑地管理
  • Advanced Integrated Landscape Management
    開講年度 : 2021
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : 生態系管理、流域保全、森林修復、自然資源政策、専門家、緑地管理
  • Environment and People
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 食のバリューチェーン、Society 5.0、エネルギー、異分野融合、持続可能性、フィールド、ロバストネス(強靱性)
  • Practical Field Work on Forest Dynamics
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林動態、攪乱、樹木、更新、森林再生
  • Data Analysis on Forest Science
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 統計的検定・?般化線形モデル・R
  • Forestry Harvesting System and Engineering
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林管理・森林計画制度・人工林施業・伐採・作業システム・生産コスト・路網・労働安全
  • Practical Field Work on Forest Management
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 人工林、密度管理、間伐、作業システム
  • Dendrology
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林帯、高木類、生態的特性、生理特性、樹木組織、利用特性、林木育種・遺伝特性
  • Forest Aesthetics and Regeneration
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林美学、空間的規制、フォレストスケープ、森林の生態系サービス、ドイツ林学;植生遷移、森林撹乱、樹種特性、近自然林業
  • Silviculture
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 樹木、森林、林業、造林、生態系、土壌、林木育種、生産、遷移、森林保護
  • Graduation Thesis
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学に関する研究、主体性、まとめる能力、伝える能力、質問への応答能力、
  • Seminar on Forest ScienceⅠ
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学、論理構築、発表技法、論文読解法、ゼミナール
  • Seminar on Forest ScienceⅡ
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学、論理構築、発表技法、論文読解法、ゼミナール
  • Exercise of Forest Planning
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 毎?調査、空中写真、GIS、人工林施業、林業の収益性、森林整備計画、ゾーニング
  • Forest Planning
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 持続可能な森林経営、林業法律、森林施業、森林?地、森林管理、森林施業、測樹学・森林航測


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