气候变化领域集成服务门户(CCPortal): Soil carbon dynamics in different types of subtropical forests as determined by density fractionation and stable isotope analysis

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DOI	10.1016/j.foreco.2020.118401
	Soil carbon dynamics in different types of subtropical forests as determined by density fractionation and stable isotope analysis
	Luo X.; Hou E.; Zhang L.; Wen D.
发表日期	2020
ISSN	0378-1127
卷号	475
英文摘要	Quantifying carbon (C) dynamics with forest land-use change is essential for predicting C sequestration and stabilization. Here, we combined density fractionation and stable isotope analysis to examine soil C dynamics after primary native broadleaf forests (BF) were converted to secondary forests (SF) and plantation forests (PF). The results showed that soil C stock at 0–30 cm depth decreased significantly from BF (70.8 Mg ha−1) to SF (60 Mg ha−1) and PF (53.9 Mg ha−1). Both soil C concentration and stock decreased, but soil δ13C of the light and heavy fractions increased, and these increases were more evident in the topsoil (0–10 cm) than in the subsoil (10–30 cm). The decrease of the heavy fraction C stocks accounted for 52.7% and 69.7% of the reduction of bulk soil C stocks with conversion of BF to SF and PF, respectively. Analysis of δ13C revealed that the input of new C into the light fraction of soil at 0–10 cm depth decreased by 13.1% with conversion of BF to SF, and by 34.0% with conversion of BF to PF. The decreases of soil C stocks in density fractions were primarily explained by soil properties (β = 0.70) but also by vegetation biomass C (β = 0.26), and were closely correlated with soil moisture content (0.69, the highest eigenvalue among soil properties) and floor litter biomass C (0.75, the highest eigenvalue among biomass C categories). Our findings help clarify the contrasting mechanisms explaining the dynamics of light and heavy fraction of soil C, and highlight the importance of both vegetation and soil in controlling changes in soil C dynamics in response to forest conversion. Accordingly, we recommend that management policies and actions should maximize biomass C inputs of degraded forests and minimize C losses. It follows that the preservation of primary forests might increase ecosystem C sequestration and thereby mitigate climate change. © 2020 Elsevier B.V.
关键词	Biomass Carbon Climate change Dynamics Eigenvalues and eigenfunctions Isotopes Land use Magnesium Soil moisture Tropics Vegetation Density fractionations Forest conversion Plantation forests Secondary forests Soil carbon dynamics Stable-isotope analysis Subtropical forests Vegetation biomass Forestry
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132609
推荐引用方式 GB/T 7714	Luo X.,Hou E.,Zhang L.,et al. Soil carbon dynamics in different types of subtropical forests as determined by density fractionation and stable isotope analysis[J]. Forest Ecology and Management,2020,475.
APA	Luo X.,Hou E.,Zhang L.,&Wen D..(2020).Soil carbon dynamics in different types of subtropical forests as determined by density fractionation and stable isotope analysis.,475.
MLA	Luo X.,et al."Soil carbon dynamics in different types of subtropical forests as determined by density fractionation and stable isotope analysis".475(2020).