Measurement of carbon accumulating rate in a tropical peat swamp

为了评价热带泥炭沼泽森林的有效积累率，测定了泥炭沼泽森林生态系统的二氧化碳排放速率。同时，建立了泥炭沼泽森林碳积累速率的简便估算方法.在泰国南部的一个原始泥炭沼泽森林中测定了泥炭和凋落物分解以及树木呼吸的二氧化碳排放量。综合计算了森林生态系统的叶、分支、茎、泥炭土、枯落物和积水面的CO2排放量。以单位表面积计，分支的呼吸速率最大。然而，每单位地表面积的树叶有最大的速率。以碳量为基础，估算出该生态系统的CO_2年排放量为8.84tC ha·<-1>yr·<-1>。茎、枝、叶、根、凋落物和泥炭的每个组分的分解值分别为6%、6%、28%、28%、18%和14%。这表明地下碳排放对泥炭沼泽森林碳平衡的评价具有重要作用.提出了一种简便的碳积累速率估算方法。用泥炭探针法原位测定了堆积密度分布。利用NC分析仪和碳同位素分析仪分别测定了该地点泥炭样品的碳含量和累积年数。通过使用这些配置文件，配置文件的碳积累率，这是约1 tC/公顷/年前最近的森林砍伐。

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.