Dissolved Organic Carbon in Coniferous Forests of Central Siberia
Dissolved Organic Carbon in Coniferous Forests of Central Siberia
复制标题
西伯利亚中部针叶林中的溶解有机碳
DOI：
10.1098/rsta.1995.0038
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. P. Abaimov
中科院分区：
文献类型：
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作者：
A. Prokushkin;S. G. Prokushkin;H. Shibata;Y. Matsuura;A. P. Abaimov
比较了西伯利亚中部森林生态系统(包括多年冻土区、山区和南部泰加林区)中溶解有机碳(DOC)的释放，比较了不同立地环境条件的影响。樟子松(南部)、冷杉(山地)和兴安落叶松(永久冻土)具有不同的适应策略，覆盖了具有独特水文气候条件的地区。在森林类型中，凋落物的溶解有机碳DOC通量比林地植被和穿透雨的溶解有机碳通量大。降雨量和分解层温度是影响DOC释放的最重要因素。供热不足导致落叶松林分枯枝落叶层中可提取DOC含量急剧下降。穿透水中DOC的流入对有机土层中DOC的动态变化也很重要。多年冻土和玄武岩基岩不透水层的形成，导致流域内溪水中DOC浓度较高。降雨量对溪水中DOC的输出有较大影响。经过长期降雨，落叶松流域溪水DOC通量达到38MGC‘m~(-2)·d~(-1)，比2003年高出近100倍
Release of dissolved organic carbon (DOC) from boreal forest ecosystems of central Siberia including permafrost, mountain and south taiga zones was compared in terms of influence of site specific environmental conditions. Pinus sylvestris (southern part), Abies sibirica (mountain) and Larix gmelinii (permafrost) have different adaptational strategies and cover areas with unique hydroclimatic conditions. Among forest patterns, litter is characterized by large dissolved organic carbon DOC flux compared to that of forest floor vegetation and throughfall. Precipitation and temperature of decomposing layers were found to be the most important factors determining DOC release. Insufficient heat supply has led to a sharp decrease in extractable DOC contents in the forest floor and litter in the larch stand. DOC influx in throughfall was also important for the DOC dynamics in the organic horizon. The formation of impermeable layers of permafrost and basalt bedrock have resulted in a high DOC concentration in stream water in the watershed. Precipitation magnitude considerably affected DOC output in stream water. After long-term rainfall, DOC flux in stream water in the larch basin reached 38 mgC'm- 2 d-I, almost IOO-fold higher than that during
241-251 (1992)
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