干旱区生态环境知识资源中心(Arid): Using geochemical elements to discriminate sediment sources in a typical karst watershed

Arid

DOI	10.1016/j.still.2023.105778
	Using geochemical elements to discriminate sediment sources in a typical karst watershed
	Li, Chengfang; Wang, Zhongcheng; Li, Zhenwei; Xu, Xianli; Wang, Kelin
通讯作者	Li, ZW
来源期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
EISSN	1879-3444
出版年	2023
卷号	232
英文摘要	Knowledge of temporal variations in sediment sources is necessary to identify the principal sources of sediment for effective implementation of soil conservation measures and to improve the calibration and validation of process-based soil erosion models. Quantitative information on sediment provenance is often limited in karst regions because of their complex surfaces and underground three-dimensional erosion systems. Peak-cluster depressions are typical landforms in karst areas and can well intercept most sediment from hillsides such as dams or reservoirs. Thus, peak-cluster depressions are suitable areas for sediment source identification. The objective of this study was to quantify the contribution of sediment sources in a typical karst watershed and to identify temporal variations in sediment sources in the watershed in the past 60 years. We collected 194 soil samples from three sediment profiles in a karst depression and 58 source samples from cropland, fissure soil, and forestland. We used a composite fingerprinting method based on 45 geochemical properties and an IsoSource multivariate mixed model in a typical karst watershed. The results indicate that cropland was the principal sediment source (89.2 %) in the last 60 years, followed by fissure soil (9.6 %) and forestland (1.2 %). Importantly, compared with the period from 1949 to 1999, the contribution of sediment from fissure soil reached a maximum value of approximately 20 % from 1999 to 2015. This result implies that the Grain for Green program, which was implemented in 1999, clearly reduced the amount of soil erosion from cropland. Therefore, the program may greatly affect sediment deposition in karst depressions. Using metal ratios as fingerprint factors, the IsoSource mixed model can be effectively used to study the source of sediments in karst watersheds quantitatively. This study can aid the existing understanding of soil erosion processes and contributes to the sustainable development of agro-ecology in karst watersheds.
英文关键词	Soil erosion Sediment provenance Fingerprinting IsoSource Karst depression
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001012739900001
WOS关键词	TRACING SUSPENDED SEDIMENT ; SOIL-EROSION ; LOESS PLATEAU ; COMPOSITE FINGERPRINTS ; ROCKY DESERTIFICATION ; SMALL CATCHMENT ; LAND-USE ; IMPACTS ; REGION ; RATES
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398669
推荐引用方式 GB/T 7714	Li, Chengfang,Wang, Zhongcheng,Li, Zhenwei,et al. Using geochemical elements to discriminate sediment sources in a typical karst watershed[J],2023,232.
APA	Li, Chengfang,Wang, Zhongcheng,Li, Zhenwei,Xu, Xianli,&Wang, Kelin.(2023).Using geochemical elements to discriminate sediment sources in a typical karst watershed.SOIL & TILLAGE RESEARCH,232.
MLA	Li, Chengfang,et al."Using geochemical elements to discriminate sediment sources in a typical karst watershed".SOIL & TILLAGE RESEARCH 232(2023).