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Measurement of carbon accumulating rate in a tropical peat swamp

热带泥炭沼泽碳积累率的测量

基本信息

批准号：
12660235
负责人：
ISHIDA Tomoyasu
金额：
$ 2.62万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12660235/
关键词：
carbon balance carbon sink decomposition respiration peat swamp forest tropical peat

项目摘要

In order to evaluate the available accumulation rate in a tropical peat swamp forest, emission rate of carbon dioxide from the peat swamp forest ecosystem was measured. Also, simple and convenient method was developed to estimate carbon accumulation rate in a peat swamp forest.1. Carbon dioxide (CO_2) emission by peat and litter decomposition and by tree respiration were measured in a primary peat swamp forest of southern Thailand. The obtained emission rates from foliage, branch, stem, peat soil, litter and ponding water surface were integrated to estimate the total CO_2 emission from the forest ecosystem. On the basis of unit surface area, the branch had the greatest respiration rate among the aboveground components. However, the foliage had the greatest rate per unit ground surface area. Annual CO_2 emission from the ecosystem was estimated to 8.84 tC ha^<-1> yr^<-1> on the carbon weight basis. The breakdown of the value to each component was 6, 6, 28, 28, 18 and 14 % for stems, branches, foliage, roots, litter and peat, respectively. This indicates that emission from underground plays quite important role to assess the carbon balance of the peat swamp forest.2. Simple and convenient method to estimate carbon accumulation rate was developed. Profile of bulk density was measured in situ by Peat Probe method. Profiles of carbon content and accumulated year for sampled peat at the site were determined by NC analyzer and by Carbon isotopes, respectively. By using these profiles, profile of carbon accumulation rate was derived, which was about 1 tC/ha/year before the recent deforestation.

为了评价热带泥炭沼泽森林的有效积累速率，测定了热带泥炭沼泽森林生态系统的二氧化碳排放速率。同时，提出了一种简便易行的估算泥炭沼泽森林碳积累速率的方法。测定了泰国南部一原始泥炭沼泽森林中泥炭、凋落物分解和树木呼吸所释放的二氧化碳。综合得到的叶、枝、干、泥炭土、凋落物和池塘水面的排放速率，估算了森林生态系统的总co2排放。按单位表面积计算，枝条在地上组分中呼吸速率最大。而单位地表面积的速率以叶片最高。按碳重计算，该生态系统年CO_2排放量为8.84 tC ha^<-1> yr^<-1>。茎、枝、叶、根、凋落物和泥炭对各组分的贡献率分别为6%、6%、28%、28%、18%和14%。这表明地下碳排放对评价泥炭沼泽森林的碳平衡具有相当重要的作用。提出了一种简便易行的碳积累速率估算方法。用泥炭探针法原位测量了堆密度剖面。利用NC分析仪和碳同位素分别测定了现场泥炭样品的碳含量和累积年份。利用这些剖面，得到了近期毁林前的碳积累速率剖面，约为1 tC/ha/年。