Stable isotopic constraints on global soil organic carbon turnover

doi:10.5194/bg-15-987-2018

CORC > 沈阳应用生态研究所 > 中国科学院沈阳应用生态研究所 > 沈阳应用生态研究所 > 期刊论文

	Stable isotopic constraints on global soil organic carbon turnover
	Wang, Chao 1; Houlton, Benjamin Z.2; Liu, Dongwei 1; Hou, Jianfeng 1,3; Cheng, Weixin 1,4; Bai, Edith 1,5
刊名	BIOGEOSCIENCES
	2018-02-20
卷号	15 期号:4 页码:987-995
ISSN号	1726-4170
DOI	10.5194/bg-15-987-2018
英文摘要	Carbon dioxide release during soil organic carbon (SOC) turnover is a pivotal component of atmospheric CO2 concentrations and global climate change. However, reliably measuring SOC turnover rates on large spatial and temporal scales remains challenging. Here we use a natural carbon isotope approach, defined as beta (beta), which was quantified from the delta C-13 of vegetation and soil reported in the literature (176 separate soil profiles), to examine large-scale controls of climate, soil physical properties and nutrients over patterns of SOC turnover across terrestrial biomes worldwide. We report a significant relationship between beta and calculated soil C turnover rates (k), which were estimated by dividing soil heterotrophic respiration rates by SOC pools. ln(-beta) exhibits a significant linear relationship with mean annual temperature, but a more complex polynomial relationship with mean annual precipitation, implying strong-feedbacks of SOC turnover to climate changes. Soil nitrogen (N) and clay content correlate strongly and positively with ln(-beta), revealing the additional influence of nutrients and physical soil properties on SOC decomposition rates. Furthermore, a strong (R-2 = 0.76; p < 0.001) linear relationship between ln(-beta) and estimates of litter and root decomposition rates suggests similar controls over rates of organic matter decay among the generalized soil C stocks. Overall, these findings demonstrate the utility of soil delta C-13 for independently bench-marking global models of soil C turnover and thereby improving predictions of multiple global change influences over terrestrial C-climate feedback.
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000425614000001
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/109267]
专题	沈阳应用生态研究所_沈阳应用生态研究所_期刊论文
通讯作者	Bai, Edith
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110164, Liaoning, Peoples R China 2.Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 4.Univ Calif Santa Cruz, Dept Environm Studies, 1156 High St, Santa Cruz, CA 95064 USA 5.Northeast Normal Univ, Sch Geog Sci, Changchun 130024, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Wang, Chao,Houlton, Benjamin Z.,Liu, Dongwei,et al. Stable isotopic constraints on global soil organic carbon turnover[J]. BIOGEOSCIENCES,2018,15(4):987-995.
APA	Wang, Chao,Houlton, Benjamin Z.,Liu, Dongwei,Hou, Jianfeng,Cheng, Weixin,&Bai, Edith.(2018).Stable isotopic constraints on global soil organic carbon turnover.BIOGEOSCIENCES,15(4),987-995.
MLA	Wang, Chao,et al."Stable isotopic constraints on global soil organic carbon turnover".BIOGEOSCIENCES 15.4(2018):987-995.