Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China

doi:10.1016/j.catena.2021.105654

	Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China
	Shi, Yuehong 1; Tang, Xiaolu 2,3; Yu, Peng 1; Xu, Li 4; Chen, Guo 2,3; Cao, Longxi 2,3; Song, Ci 5; Cai, Chunju 6; Li, Jingji 2,3
刊名	CATENA
	2021-12-01
卷号	207 页码:10
关键词	Climate Soil carbon stock Subsoil carbon turnover Soil properties Structural equation model
ISSN号	0341-8162
DOI	10.1016/j.catena.2021.105654
通讯作者	Tang, Xiaolu(lxtt2010@163.com) ; Li, Jingji(412450093@qq.com)
英文摘要	Soil organic carbon turnover time (tau, year) is an important indicator of soil carbon stability and a major factor determining soil carbon sequestration capacity. Many previous studies have investigated tau in the topsoil layers, but little is known about subsoil tau and its environmental drivers. We estimated subsoil tau (the ratio of subsoil organic carbon (OC) stock to net primary production) using field observations from the published literatures and employed regression analysis and the structural equation model (SEM) to identify the effects of climate, soil, and vegetation variables on subsoil tau in China's grasslands. The results showed that the average subsoil tau over 0.2-1 m varied greatly from 5.5 to 702.2 years, with a mean (+/- standard deviation) of 118.5 +/- 97.8 years. Subsoil tau varied significantly among different grassland types, with 164.0 +/- 112.0 years for alpine meadow, 107.0 +/- 47.9 years for alpine steppe, 177.0 +/- 143.0 years for temperate desert steppe, 96.6 +/- 88.7 years for temperate meadow steppe, and 101.0 +/- 75.9 years for temperate typical steppe. Subsoil tau was significantly negatively correlated (p < 0.05) with normalized difference vegetation index, leaf area index, and gross primary production. Mean annual (air) temperature and precipitation had a negative impact on tau, indicating a faster turnover of soil carbon with a changing climate. Based on SEM, soil properties mainly drove subsoil tau, challenging our current understanding and providing evidence that different factors control topsoil and subsoil tau. In this sense, different environmental factors should be considered to reliably predict soil carbon dynamics at the top of 1 m and subsoils in biogeochemical models or Earth system models at regional or global scales.
资助项目	National Natural Science Foundation of China[31800365] ; National Key Research and Development Project[2018YFD0600103] ; Fundamental Research Funds for Platform of International Centre for Bamboo and Rattan[1632019011] ; Foundation for University Key Teacher of Chengdu University of Technology[10912-2019JX-06910] ; Sichuan Science and Technology Program[2019YFG0460] ; Everest Scientific Research Program, Chengdu University of Technology[80000-2021ZF11410] ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project[SKLGP2018Z004] ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project[SKLGP2021K024] ; Research on key technologies of Mountain rail transit green construction in ecologically sensitive region based on Mountain rail transit from Dujiangyan[2018-ZL-08]
WOS关键词	BELOW-GROUND CARBON ; LEAF-AREA INDEX ; TERRESTRIAL ECOSYSTEMS ; PRIMARY PRODUCTIVITY ; GRAZING EXCLUSION ; GLOBAL PATTERNS ; LOESS PLATEAU ; VEGETATION ; RESPIRATION ; CLIMATE
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000703268900072
资助机构	National Natural Science Foundation of China ; National Key Research and Development Project ; Fundamental Research Funds for Platform of International Centre for Bamboo and Rattan ; Foundation for University Key Teacher of Chengdu University of Technology ; Sichuan Science and Technology Program ; Everest Scientific Research Program, Chengdu University of Technology ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project ; Research on key technologies of Mountain rail transit green construction in ecologically sensitive region based on Mountain rail transit from Dujiangyan
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/166093]
专题	中国科学院地理科学与资源研究所
通讯作者	Tang, Xiaolu; Li, Jingji
作者单位	1.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China 2.Chengdu Univ Technol, Coll Ecol & Environm, Chengdu 610059, Sichuan, Peoples R China 3.Chengdu Univ Technol, State Environm Protect Key Lab Synerget Control &, Chengdu 610059, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 5.China Railway Eryuan Engn Grp Co Ltd, Chengdu 610031, Peoples R China 6.Natl Forestry & Grassland Adm, Int Ctr Bamboo & Rattan, Key Lab Bamboo & Rattan Sci & Technol, Beijing 100102, Peoples R China
推荐引用方式 GB/T 7714	Shi, Yuehong,Tang, Xiaolu,Yu, Peng,et al. Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China[J]. CATENA,2021,207:10.
APA	Shi, Yuehong.,Tang, Xiaolu.,Yu, Peng.,Xu, Li.,Chen, Guo.,...&Li, Jingji.(2021).Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China.CATENA,207,10.
MLA	Shi, Yuehong,et al."Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China".CATENA 207(2021):10.