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2001 Fiscal Year Final Research Report Summary

Life Zone Ecology of the Bhutan Himaraya III

Research Project

Project/Area Number 11691173
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section海外学術
Research Field 生態
Research InstitutionThe University of Tokyo (2000-2001)
Chiba University (1999)

Principal Investigator

OHSAWA Masahiko  The University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 教授 (80092477)

Co-Investigator(Kenkyū-buntansha) TAKADA Masashi  Nara Women's University, Associate Professor, 文学部, 助教授 (60273827)
EGUCHI Takashi  Kochi University, Professor, 人文学部, 教授 (30263966)
Project Period (FY) 1999 – 2001
Keywordsforest zone / Life Zone / dry valley / temperature lapse rate / mass movement / shifting cultivation / torest recovery / tree traits
Research Abstract

Altitudinal patterns in clhimatologjcal, geomorphological, and ecological features of the Bhutanese life-zones were studied in a range of c. 1000-3500 m a.s.l. during 1999-2001. Temperature and moisture conditions were recorded in data loggers and obtained complete year round data from September 1999 to August 2001 along Tsang Chu. Temperature lapse rate was varied by the topographical situation of the measuring sites in a range of 0.57-0.62 C/100m. The lapse rate is larger in dry season (April) and smaller in monsoon rain season reflecting relative humidity. Mass movement is extremely active in the Bhutan Himalaya. Land slides took place by shearing on a bedding plane in the area underlain by metamorphic rocks. As the consequences river channels shift in the dip direction of the bedding plane and asymmetric valleys have developed. Vegetation zonation along altihidinal series were studied along Gasa series, Lobesa series, and Seagor-Lingmethang series. Gasa series mainly focused on topographical diversification within each life zone, Lobesa series had clear zonation from dry valley bottom to humid mountain cloud forests on ridges. From warm/dry Pinus roxburghii forests, mid-altitudinal Quercus griffithii/Q. lanata forests, Quercus glauca /Q. semecarpifolia forests, and Isuga dumosa forests and Abies densa forests above 2700 m. One third of the Bhutanese agricultural fields are maintained as shifting cultivation, and the sites are interesting for their secondary succession during fallow periods. There are two types of shifting cultivation in Bhutan, grass fallow (pangshing) of five year fallow and forest fallow (tseri) of 12 year fallow periods. For the former, we did in Bumthang, and for the latter in Shemgang, both place are the major area for both each types of shifting cultivation. In both sites we analyzed vegetation succession and soil developments, and found critical conditions for the sustainable managements for the system.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Ohsawa, M, Nitta, I.: "Forest zonation and morphological tree-traits along latitudinal and altitudinal environmental gradients in humid monsoon Asia"Global Environmental Research. 6(1). 41-52 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tang, C.Q., Ohsawa, M: "Coexistence mechanisms of evergreen, deciduous and coniferous trees in a mid-montane mixed forest on Mt. Emei, Sichuian, China"Plant Ecology. 161. 215-230 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kikvidze, Z., Ohsawa, M.: "Measuring the number of co-dominants in ecological communities"Ecological Research. 17(4). 519-525 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nitta, I, Ohsawa, M: "Geographical transition of sylleptic/proleptic branching in three Cinnamomum species with different bud types"Annals of Botany. 87. 35-45 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Bhuju, DR, Ohsawa, M: "Patch implications in the maintenance of species richness in an isolated forest site"Biological Conservation. 98. 117-125 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kikvidze, Z., Ohsawa, M.: "Richness of Colchic vegetation : comparison between refugia of south-western and East Asia"BMC Ecology. 1. 1-10 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大沢雅彦(監修・分担執筆): "生態学から見た身近な植物群落の保全"講談社. 244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshida,N, Ohsawa, M.: "Seeding success of Tsuga sieboldii along a microtopographic gradient in a mixed cool-temperate forest in Japan"Plant Ecology. 140. 89-98 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Bhuju,D.R., Ohsawa,M.: "Species dynamics and colomization patterns in an abandoned forest in an urban landscape"Ecological Research. 14. 139-153 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tang,C.O., Ohsawa,M.: "Altitudinal distribution of evergreen broad-leaved trees and their leaf-size pattern on a humid subtropical moutain, Mt.Emei, Sichuan, China"Plant Ecology. 145. 221-233 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nitta,L, Ohsawa,M: "Geographical transition of sylleptic/proleptic branching in three Cinnamomum species with different bud types"Annals of Botany. 87. 35-45 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Bhuju,D.R., Ohsawa,M.: "Patch implications in the maintennance of species richness in an isolated forest site"Biological Conservation. 98. 117-125 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kikvidze,Z, Ohsawa,M.: "Richness of Colchic vegetation : comparison between refugia of south-western and East Asia"BMC Ecology. 1. 1-10 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ktazawa,T., Ohsawa,M.: "Patterns of species diversity in rural herbaceous communities"Ecological Research. 17 No.4. 519-525 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tang,C.O., Ohsawa,M.: "A Tertiary relic deciduous forest on a humid subtropical moutain, Mt.Emei, Sichuan, China"Folia Geobotanica. 37. 93-106 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tang,C.O., Ohsawa,M.: "Coexistence mechanisms of evergreen, deciduous and coniferous trees in a mid-montane mixed forest on Mt.Emei, Sichuan, China"Plant Ecology. 161. 215-230 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohsawa,M., Nitta,I: "Forest Zonation and Morphological Tree-traits along Latitudinal and Altitudinal Environmental Gradients in Humid Monsoon Asia"Global Environmental Research. 6(1). 41-52 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wangda,P., Ohsawa,M.: "Transition of forest structure and environmental conditions along the altitudinal gradient in a dry valley, upper Lobesa, Bhutan"Proceedings of IUCN WCPA-EA Conference, Taiwan2002. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nitta,L, Ohsawa,M , eds. by Zheng Du & Zhu Liping: "Phenological and bud morphological traits of evergreen broad-leaved trees under the strong seasonal climate at northern limit in Ease Asia, In Formation and Evolution, Environmental Changes and Sustainable Development on the Tibetan Plateau : preceedings of International Symposium on the Qinhai-Tibetan Plateau"Academy Press. 357-364 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tang,C.O., Ohsawa,M. , eds. by Zheng Du & Zhu Liping: "Transitional pattern of tree leaf-types from tropical to temparate forests on Mt.Emei, Sichuan, China, In , Formation and Evolution, Environmental Changes and Sustainable Development on the Tibetan Plateau : proceedings of Internationl Symposium on the Qinghai-Tibetan Plateau"Academy Press. 397-407 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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