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Climatic Influence on Asian Tropical Rain Forest Dynamics

Research Project

Project/Area Number 11691194
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section海外学術
Research Field 生態
Research InstitutionOsaka City University

Principal Investigator

YAMAKURA Takuo  Osaka City University, Faculty of Science, Professor, 理学部, 教授 (10089956)

Co-Investigator(Kenkyū-buntansha) HARA Masatoshi  Chiba Natural History Museum & Institute, Senior Research Fellow, 学芸員 (20250144)
KANZAKI Mamoru  Kyoto University, Graduate School of Agriculture, Ass.Prof., 大学院・農学研究科, 助教授 (70183291)
ITOH Akira  Osaka City University, Faculty of Science, Lecturer, 理学部, 講師 (40274344)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥8,700,000 (Direct Cost: ¥8,700,000)
Fiscal Year 2000: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 1999: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsTropical rain forest / Climate change / community dynamics / El Nino / La Nina / Large-scale research plot / Malaysia / Thailand / 気象変
Research Abstract

In the Asian tropics, an El Nino event brings a draught, while a La Nina induces wet climate. This study investigates the effect of two contrasting climatic events, El Nino and La Nina, on the forest community dynamics of tropical rain forest in Southeast Asia. Field work was conducted in a lowland tropical rain forest in Malaysia and a lower montane tropical rain forest in Thailand. In the Malaysian site, all the living trees>1.0 cm dbh within a 52-hecatre plot were labeled, mapped, identified to species, and measured by dbh in 1992. The second enumeration was conducted in 1997. The dead trees were observed again in 1999. Out of the 359965 living trees in 1997, 15798 trees died after two years, showing a mortality of 0.022/yr, which is greater than 0.013/yr observed in 1992-1997. The increase of mortality suggests the impact of El Nino(1997/1998)and La Nina(1998/1999)on forest dynamics. The mortality rate of 0.013/yr gives an estimate of 9359 dead trees in 1998 and 1999, when El Nino … More and La Nina could not hypothetically occurred. Therefore 6439 trees are estimated to be killed by El Nino and Lanina. The number of dead trees within the new landslide areas of 0.32 ha in 1999 is 2235. Hence the trees killed by El Nino are equivalent to 4204. These estimates suggest the mortality rate of 0.012 due to El Nino and that of 0.0064 due to La Nina. The dependency of mortality rates on topography is clear, since mortality rates are higher on ridges than in valleys. A multiple regression analysis on illipe nut exports from Sarawak showed a strong correlation between exported illipe nut quantities and draft probability, which is defined by the ratio of the monthly number of weather stations with rainfall less than 100 mm/month to the monthly total number of available weather stations in Sarawak. In the montane forest of Thailand, population dynamics of Fagaceae and Lauraceae speices were monitored in a 15 ha plot. However, no clear sympotoms were observed, concerning the relationships between forest dynamics and El Nino/La Nina. Although the unusual cold temperature of minus 3.2 C was observed on 25 December 1999, flowering did not occurred in the spring 2000, suggesting another flowering trigger different from dipterocarps in Malaysia. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 神崎 護: "熱帯山地林と温帯照葉樹林の比較群集論-ニッチ分割パターンの比較-"TROPICS. 9(3). 211-228 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada Toshihiro: "Local and geographical distributions for a tropical tree genus, Scaphium(Sterculiaceae)in the Far East."Plant Ecology. 148. 23-30 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Richard Condit: "Spatial patterns in the distribution of tropical tree species."Science . 288. 1414-1418 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Itoh Akira: "Effects of light intensity on the growth and allometry of two Bornean Dryobalanops(Dipterocarpceae)seedlings."Journal of Tropical Forest Science. 11. 610-618 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 菊沢喜八郎: "森の自然誌(複雑系の生態学)"北海道大学図書刊行会. 236 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kanzaki Mamoru: "Comparative community ecology of tropical montane and temperate lucidophyll forests : comparison of niche differentiation pattern."TROPICS. 9-3. 211-228 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada Toshihiro: "Local and geographical distributions for a tropical genus, Scaphium(Sterculiaceae)in the Far East."Plant Ecology. 148. 23-30 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Richard Condit: "Spatial patterns in the distribution of tropical tree species."Science. 288. 1414-1418 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Itoh Akira: "Effects of light intensity on the growth and allometry of two Bornean Dyobalanops(Dipterocarpaceae)seedlings."Journal of Tropical Forest Science. 11. 610-618 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kikuzawa Kihachiro: "Natural History of Forests : ecology of complex systems"Hokkaido University Press. 236 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 神崎護: "熱帯山地林と温帯照葉樹林の比較群集論-ニッチ分割パターンの比較-"TROPICS. 9(3). 211-228 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamada Toshihiro: "Local and geographical distributions for a tropical tree genus, Scaphium (Sterculiaceae) in the Far East."Plant Ecology. 148. 23-30 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Richard Condit: "Spatial patterns in the distribution of tropical tree species."Science. 288. 1414-1418 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Itoh Akira: "Effects of light intensity on the growth and allometry of two Bomean Dryobalanops (Dipterocarpceae) seedlings."Journal of Tropical Forest Science. 11. 610-618 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 菊沢喜八郎: "森の自然誌【複雑系の生態学】"北海道大学図書刊行会. 236 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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