Factors controlling the spatial variability of soil aggregates and associated organic carbon across a semi-humid watershed

doi:10.1016/j.scitotenv.2021.151155

	Factors controlling the spatial variability of soil aggregates and associated organic carbon across a semi-humid watershed
	Zhang, Pingping 3,4,5; Wang, Yunqiang 1,3,4,5; Xu, Lan 1,5; Sun, Hui 2,5; Li, Ruijie 2,5; Zhou, Jingxiong 1,5
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2022-02-25
卷号	809 页码:15
关键词	Aggregate stability Carbon stability Carbon sequestration Carbon fraction Structural equation modelling Loess Plateau
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2021.151155
通讯作者	Wang, Yunqiang(wangyq@ieecas.cn)
英文摘要	Y Soil aggregates (SA) play crucial roles in soil organic carbon (SOC) sequestration. Different SA fractions contribute differently to the sequestration of SOC. However, few studies have examined the factors controlling SA fractions and associated SOC contents across a watershed. Soil samples were collected at 0-10 cm (surface layer) and 10-20 cm (subsurface layer) from 88 sites across a semi-humid watershed (1.1 km(2)) on the Loess Plateau, China. These samples were separated into macroaggregates (MA), microaggregates (MI), and silt + clay fractions (SC) by wet-sieving, and SOC content of each fraction was determined. The objectives were to: 1) investigate the spatial variability of SA fractions and associated SOC contents as well as their main controls across an entire watershed, and 2) explore the linkages between soil aggregation and SOC sequestration. The bulk and aggregate SOC contents of all SA fractions showed moderate variability, with coefficient of variations of 23.3-31.9%. Geostatistical analysis indicated that the spatial patterns of SA fractions and SOC content varied with aggregate size. From combined Spearman's correlation analysis and structural equation modelling, we found that soil texture was an important control on the spatial variability of all SA fractions and associated SOC contents. Vegetation dynamics and management practices associated with land use were also important controls on MA and MI and their associated SOC contents, especially in the surface layer. However, SC and its associated SOC content were more sensitive to ecohydrological processes related to topography. Among the land uses, grassland had the greatest SOC sequestration potential. The fine roots of herbs can wrap MI in MA and increase SOC content within MA, which is the primary mechanism responsible for SOC sequestration in grasslands. These results indicate that using vegetation with fine root systems for restoration is a good strategy to increase SOC sequestration in this region. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40020203] ; National Natural Science Foundation of China[41971045] ; Youth Innovation Promotion Association of CAS ; West Light Foundation of CAS
WOS关键词	LOESS-PALEOSOL SEQUENCE ; LAND-USE CHANGE ; STABILITY ; DYNAMICS ; NITROGEN ; PLATEAU ; MATTER ; FRACTIONS ; CLIMATE ; SCALE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000743255100012
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of CAS ; West Light Foundation of CAS
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/17416]
专题	地球环境研究所_生态环境研究室
通讯作者	Wang, Yunqiang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China 3.Natl Observat & Res Stn Earth Crit Zone Loess Pla, Xian 710061, Peoples R China 4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 5.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Pingping,Wang, Yunqiang,Xu, Lan,et al. Factors controlling the spatial variability of soil aggregates and associated organic carbon across a semi-humid watershed[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,809:15.
APA	Zhang, Pingping,Wang, Yunqiang,Xu, Lan,Sun, Hui,Li, Ruijie,&Zhou, Jingxiong.(2022).Factors controlling the spatial variability of soil aggregates and associated organic carbon across a semi-humid watershed.SCIENCE OF THE TOTAL ENVIRONMENT,809,15.
MLA	Zhang, Pingping,et al."Factors controlling the spatial variability of soil aggregates and associated organic carbon across a semi-humid watershed".SCIENCE OF THE TOTAL ENVIRONMENT 809(2022):15.