Current and future CO2 emissions from drained peatlands in Southeast Asia
Current and future CO2 emissions from drained peatlands in Southeast Asia
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DOI：
10.5194/bg-7-1505-2010
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发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Jauhiainen, J.
中科院分区：
文献类型：
--
作者：
Hooijer, A.;Page, S.;Jauhiainen, J.
东南亚森林热带泥炭地储存至少420亿公吨（Mt）的土壤碳。人类活动和气候变化威胁着这一大水库的稳定，过去几十年来，由于森林砍伐、排水和火灾，水库面积迅速减少。在本文中，我们估计的二氧化碳（CO2）排放量所造成的排水的低地热带泥炭地的农业和林业发展，占主导地位的扰动的碳平衡在该地区。利用泥炭地范围和泥炭厚度、目前和预计的土地利用、水管理做法和分解率等数据，对排水泥炭地目前和未来的排放量进行量化。到2006年，东南亚2，710万公顷（Mha）的泥炭地中，有1，290万公顷已被砍伐，大部分已被排干。由于土地开发的压力越来越大，后者的面积正在迅速增加。2006年，排水泥炭地分解造成的二氧化碳（CO2）排放量在3.55亿吨年（-1）和8.55亿吨年（-1）之间，其中82%来自印度尼西亚，主要是苏门答腊和加里曼丹。在全球范围内，东南亚泥炭地排水的二氧化碳排放量相当于目前全球化石燃料燃烧二氧化碳排放量的1.3%至3.1%。如果目前的泥炭地开发和管理做法继续下去，这些排放预计将持续数十年。这就需要将热带泥炭地的二氧化碳排放量纳入全球温室气体排放量计算和气候减缓政策。排放量计算中的不确定性进行了讨论，并确定了改进估计的研究需求。
Forested tropical peatlands in Southeast Asia store at least 42 000 Million metric tonnes (Mt) of soil carbon. Human activity and climate change threatens the stability of this large pool, which has been decreasing rapidly over the last few decades owing to deforestation, drainage and fire. In this paper we estimate the carbon dioxide (CO2) emissions resulting from drainage of lowland tropical peatland for agricultural and forestry development which dominates the perturbation of the carbon balance in the region. Present and future emissions from drained peatlands are quantified using data on peatland extent and peat thickness, present and projected land use, water management practices and decomposition rates. Of the 27.1 Million hectares (Mha) of peatland in Southeast Asia, 12.9 Mha had been deforested and mostly drained by 2006. This latter area is increasing rapidly because of increasing land development pressures. Carbon dioxide (CO2) emission caused by decomposition of drained peatlands was between 355 Mt y(-1) and 855 Mt y(-1) in 2006 of which 82% came from Indonesia, largely Sumatra and Kalimantan. At a global scale, CO2 emission from peatland drainage in Southeast Asia is contributing the equivalent of 1.3% to 3.1% of current global CO2 emissions from the combustion of fossil fuel. If current peatland development and management practices continue, these emissions are predicted to continue for decades. This warrants inclusion of tropical peatland CO2 emissions in global greenhouse gas emission calculations and climate mitigation policies. Uncertainties in emission calculations are discussed and research needs for improved estimates are identified.