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	Effects of afforestation on soil carbon turnover in China's subtropical region
	Wang S. Q. ; Liu J. Y. ; Zhang C. ; Yi C. X. ; Wu W. X.
	2011
关键词	soil organic carbon stable carbon isotope plantation forest organic-matter dynamics isotope ratios delta-c-13 values vegetation change southeast brazil land-use forest climate sequestration decomposition
英文摘要	Afforestation in China's subtropics plays an important role in sequestering CO(2) 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(13)C) 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(13)C 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(13)C composition of the upper soil layer of two plantation forests has been mainly affected by the grass biomass (13)C composition. Soil profiles with a change in photosynthetic pathway had a more complex (13)C isotope composition distribution. During the 20 years after plantation establishment, the soil organic matter sources influenced both the delta(13)C 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.
出处	Journal of Geographical Sciences
卷	21
期	1
页	118-134
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22866]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wang S. Q.,Liu J. Y.,Zhang C.,et al. Effects of afforestation on soil carbon turnover in China's subtropical region. 2011.

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