1990 Fiscal Year Final Research Report Summary
A Decade Dynamics of Equatorial Rain Forest System in Sumatra
| Project/Area Number |
01041074
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | Kagoshima University, Faculty of Science |
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Principal Investigator |
HOTTA Mitsuru Professor, Faculty of Science, Kagoshima University, 理学部, 教授 (10026817)
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| Co-Investigator(Kenkyū-buntansha) |
ERIZAL Mukht Andalas大学, 理学部, 講師
R.TAMIN Andalas大学, 理学部, 講師
SYAHBUDDIN Lecturer, Faculty of Science, Andalas University, 理学部, 講師
S.RISWAN ボゴール植物標本館, 館長
KOIKE Fumito Research Associate, Faculty of Science, Shimane University, 理学部, 助手 (20202054)
KOHYAMA Takashi Associate Professor, Faculty of Education, Kagoshima University, 教育学部, 助教授 (60178233)
SUZUKI Eizi Associate Professor, College of Liberal Arts, Kagoshima University, 教養部, 助教授 (10128431)
MUKHTAR Erizal Lecturer, Faculty of Science, Andalas University
TAMIN Rusjdi Lecturer, Faculty of Science, Andalas University
RISWAN Soedarsono Head, Herbarium Bogoriense, LIPI
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| Project Period (FY) |
1989 – 1990
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| Keywords | Species richness / Forest stratification / Tropical rain forest / Forest dynamics / Gap dynamics / Population dynamics of trees / Foliage distribution |
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| Research Abstract |
This research completed about ten-year censuses in permanent plots established in Gunung (Mount) Gadut area near Padang City of West Sumatra Province, Indonesia, and analyzed ten-year dynamics of extremely species-rich plant communities there. Six permanent plots cover altitudinal and successional gradients, including two main 1-ha plots namely Pinang Pinang Plot and Gajabuih Plot in foothill rain forests at ca. 600 m above sea level.
The two main plots contained 310 and 250 tree species above 8 cm dbh (trunk diameter at breast height), which is the maximum record of species richness in tropical rain forests. Extremely wet climate was hypothesized to cause this record. The richness was related to the stratification of the forest. Foliage leaf stratification was quantitatively described by a new profile grid-photograph technique. Montane forests showed less stratified structure, meanwhile more diverse tree flora than Japanese warm-temperate rain forests. Pioneer tree species occurring mainly in treefall gaps and secondary stands were also differentiated in their habitats in terms of disturbance regime.
The biomass increment due to growth of survived trees and recruitment of small trees was balanced with the biomass loss due to tree death in two main plots, and its turnover rate was about 0.02 per annum. Ecological traits of tree species could be classified by dbh growth rate. Subcanopy tree species had generally low relative growth rates, ca. 0.005 per annum.
Gap formation affected growth rate of successor trees. Analysis of spatial distribution of trees suggested that recruitment of small trees was frequent around dead trees. Emergent and canopy tree species showed negative correlation in spatial distribution between mother trees and established saplings, while not for subcanopy tree species.
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