干旱区生态环境知识资源中心(Arid): Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China

Arid

DOI	10.1016/j.catena.2021.105654
	Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China
	Shi, Yuehong; Tang, Xiaolu; Yu, Peng; Xu, Li; Chen, Guo; Cao, Longxi; Song, Ci; Cai, Chunju; Li, Jingji
通讯作者	Tang, XL ; Li, JJ (corresponding author), Chengdu Univ Technol, Coll Ecol & Environm, Chengdu 610059, Sichuan, Peoples R China. ; Tang, XL ; Li, JJ (corresponding author), Chengdu Univ Technol, State Environm Protect Key Lab Synerget Control &, Chengdu 610059, Peoples R China.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	207
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.
英文关键词	Climate Soil carbon stock Subsoil carbon turnover Soil properties Structural equation model
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000703268900072
WOS关键词	BELOW-GROUND CARBON ; LEAF-AREA INDEX ; TERRESTRIAL ECOSYSTEMS ; PRIMARY PRODUCTIVITY ; GRAZING EXCLUSION ; GLOBAL PATTERNS ; LOESS PLATEAU ; VEGETATION ; RESPIRATION ; CLIMATE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362826
作者单位	[Shi, Yuehong; Yu, Peng] Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China; [Tang, Xiaolu; Chen, Guo; Cao, Longxi; Li, Jingji] Chengdu Univ Technol, Coll Ecol & Environm, Chengdu 610059, Sichuan, Peoples R China; [Tang, Xiaolu; Chen, Guo; Cao, Longxi; Li, Jingji] Chengdu Univ Technol, State Environm Protect Key Lab Synerget Control &, Chengdu 610059, Peoples R China; [Xu, Li] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; [Song, Ci] China Railway Eryuan Engn Grp Co Ltd, Chengdu 610031, Peoples R China; [Cai, Chunju] 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]. 中国科学院地理科学与资源研究所,2021,207.
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.
MLA	Shi, Yuehong,et al."Subsoil organic carbon turnover is dominantly controlled by soil properties in grasslands across China".CATENA 207(2021).