Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China

doi:10.1007/s11368-020-02861-3

	Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China
	Zhang, Chencheng 1,2,6; Wang, Yunqiang 1,3,4,6; Jia, Xiaoxu 5; Shao, Ming'an 5,6
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2021-01-03
页码	18
关键词	Environmental factors Chinese Loess Plateau Land-use types Precipitation gradient Partial least squares regression
ISSN号	1439-0108
DOI	10.1007/s11368-020-02861-3
通讯作者	Wang, Yunqiang(wangyq@ieecas.cn)
英文摘要	Purpose Carbon (C) and nitrogen (N) soil profiles are influenced by several environmental factors. However, the contents and distributions of these elements in deep soils and sediments are largely underestimated. We aimed to estimate the stocks, patterns, and driving factors of deep soil C and N on the Chinese Loess Plateau (CLP) after large-scale ecological restoration projects. Materials and methods Soil organic carbon (SOC) and total nitrogen (TN) contents in different soil layers were measured directly at 86 sites along a regional transect across the CLP. Results and discussion SOC and TN contents ranged from 1.97 to 6.83 g C kg(-1) and 0.24 to 0.72 g N kg(-1), respectively, as the soil depth varied from 0 to 5 m. The mean contents and degrees of variability of SOC and TN decreased with the increasing of soil depth. Based on SOC and TN content patterns, we divided the 0-5-m soil profile into layers of 0-0.1, 0.1-0.4, 0.4-1, and 1-5 m. In the 1-5-m soil layer, approximately 70% of the mean SOC stock (14.97 kg C m(-2)) and 71% of the mean TN stock (1.75 kg N m(-2)) were stored. A partial least square regression model showed satisfactory predictive performance, with R-2 and Q(2) > 0.5 for SOC and TN stocks in the 0.1-0.4-m soil layer. Climatic factors, soil water content (SWC), and field capacity strongly affected SOC and TN stocks in all soil layers. The significance of clay content, SWC, and normalized difference vegetation index varied with soil depth and became the strongest in the 1-5-m soil layer. The highest proportion of SOC and TN stocks for this soil layer were found in grassland and in 450-550 mm rainfall zone. Conclusion Considerable amounts of SOC and TN stocks were stored in the 1-5-m-deep soils. Land-use types and rainfall zones can significantly affect the SOC and TN stocks. This information is helpful for identifying local land uses associated with high SOC and TN stocks and is essential for accurately estimating and predicting regional C and N stocks and cycles in terrestrial ecosystems.
资助项目	National Natural Science Foundation of China[41530854] ; National Natural Science Foundation of China[41722106] ; National Natural Science Foundation of China[41807020] ; Youth Innovation Promotion Association CAS ; Open Foundation of State Key Laboratory of Loess and Quaternary Geology[QDJF1803]
WOS关键词	LEAST-SQUARES REGRESSION ; LAND-USE CHANGE ; CLIMATE-CHANGE ; MOISTURE DYNAMICS ; SPATIAL-PATTERN ; GROWING-SEASON ; DEEP PROFILES ; MINERAL SOIL ; SEQUESTRATION ; STORAGE
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000604538600001
资助机构	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Open Foundation of State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/136475]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang, Yunqiang
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China 4.Xi An Jiao Tong Univ, Dept Earth & Environm Sci, Xian 710049, Peoples R China 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 6.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Chencheng,Wang, Yunqiang,Jia, Xiaoxu,et al. Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China[J]. JOURNAL OF SOILS AND SEDIMENTS,2021:18.
APA	Zhang, Chencheng,Wang, Yunqiang,Jia, Xiaoxu,&Shao, Ming'an.(2021).Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China.JOURNAL OF SOILS AND SEDIMENTS,18.
MLA	Zhang, Chencheng,et al."Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China".JOURNAL OF SOILS AND SEDIMENTS (2021):18.