Effects of afforestation on soil carbon turnover in China's subtropical region

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	Effects of afforestation on soil carbon turnover in China's subtropical region
	Liu Jiyuan(刘纪远)
刊名	JOURNAL OF GEOGRAPHICAL SCIENCES
	2011
卷号	21 期号:1 页码:118-134
关键词	soil organic carbon stable carbon isotope plantation forest
通讯作者	Wang SQ
中文摘要	Afforestation in China's subtropics plays an important role in sequestering CO2 from the atmosphere and in storage of soil carbon (C). Compared with natural forests, plantation forests have lower soil organic carbon (SOC) content and great potential to store more C. To better evaluate the effects of afforestation on soil C turnover, we investigated SOC and its stable C isotope (delta C-13) composition in three planted forests at Qianyanzhou Ecological Experimental Station in southern China. Litter and soil samples were collected and analyzed for total organic C, delta C-13 and total nitrogen. Similarly to the vertical distribution of SOC in natural forests, SOC concentrations decrease exponentially with depth. The land cover type (grassland) before plantation had a significant influence on the vertical distribution of SOC. The SOC delta C-13 composition of the upper soil layer of two plantation forests has been mainly affected by the grass biomass C-13 composition. Soil profiles with a change in photosynthetic pathway had a more complex C-13 isotope composition distribution. During the 20 years after plantation establishment, the soil organic matter sources influenced both the delta C-13 distribution with depth, and C replacement. The upper soil layer SOC turnover in masson pine (a mean 34% of replacement in the 10 cm after 20 years) was more than twice as fast as that of slash pine (16% of replacement) under subtropical conditions. The results demonstrate that masson pine and slash pine plantations cannot rapidly sequester SOC into long-term storage pools in subtropical China.
学科主题	Geography ; Physical
收录类别	SCI
资助信息	National Natural Science Foundation of China [30670312]; Chinese Academy of Sciences [KZCX2-YW-305-3]
公开日期	2011-05-27
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/3155]
专题	地理科学与资源研究所_专家文献库
推荐引用方式 GB/T 7714	Liu Jiyuan. Effects of afforestation on soil carbon turnover in China's subtropical region[J]. JOURNAL OF GEOGRAPHICAL SCIENCES,2011,21(1):118-134.
APA	Liu Jiyuan.(2011).Effects of afforestation on soil carbon turnover in China's subtropical region.JOURNAL OF GEOGRAPHICAL SCIENCES,21(1),118-134.
MLA	Liu Jiyuan."Effects of afforestation on soil carbon turnover in China's subtropical region".JOURNAL OF GEOGRAPHICAL SCIENCES 21.1(2011):118-134.