2005 Fiscal Year Final Research Report Summary
Testing a common allometric equation for predicting the above-ground weight of trees and estimation of net ecosystem production
| Project/Area Number |
15580123
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学・森林工学
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| Research Institution | Gifu University |
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Principal Investigator |
KOMIYAMA Akira Gifu University, Faculty of Applied Biological Sciences, Professor, 応用生物科学部, 教授 (60135184)
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| Co-Investigator(Kenkyū-buntansha) |
KOIZUMI Hiroshi Gifu University, River Basin Research Center, Professor, 流域圏科学研究センター, 教授 (50303516)
KATO Shogo Gifu University, Faculty of Applied Biological Sciences, Research associate, 応用生物科学部, 助手 (20324288)
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| Project Period (FY) |
2003 – 2005
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| Keywords | NEP / NPP / soil respiration / Carbon fix / Allometry / Biomass / Deciduous forest / Seasonality |
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| Research Abstract |
In the previous study (Komiyama et al. 2005 ; J.Trop.Ecol. 21:471-477), a common allometric equation for predicting the above-ground weight was developed for mangrove tree species based on a biological theory of statical model of plant form. In the present study, I examine whether this equation is applicable to a wide variety of tree species growing in East-Asia, including mangroves. The 387 tree data consisted of over 71 species were collected from tropical to temperate forests located in Indonesia, Thailand, and Japan. A common allometric equation between the above-ground tree weight and trunk diameter held significantly for these trees adding the wood density of trunk as a variable. The relative error between actual and estimated above-ground weight was 19.5% for this equation.
In 110-year-old secondary forest, Net primary production (NPP) of aboveground=9.96 ton/ha/year. NPP of underground=0.97 ton/ha/year. Thus, in 110-year-old secondary forest, NPP=10.93 ton/ha/year. On the other hand, net ecosystem production (NEP) is calculated by subtraction of heterotrophic respiration (HR) from NPP. HR assumes half of soil respiration and carbon content also assumes half of tree and/or litter. Thus, NEP=NPP-HR=4.98-3.71=1.27 ton carbon /ha/year, in this stand.
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