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Variations in the concentration, composition, and sources of WEOM in erosion and deposition landscapes over an erosion intensity gradient on the Loess Plateau of China

文献类型：期刊论文

作者Yao, Yufei1,4,5; Wei, Xiaorong1,3,4; Kong, Weibo4; Li, Ming2; Wang, Zhe4; Zhao, Zhongna1; Shao, Mingan1,4
刊名CATENA
出版日期2023-03-01
卷号222页码:13
ISSN号0341-8162
关键词Soil erosion Water-extractable organic matter Deep soils Fluorescence analysis EEMs-PARAFAC
DOI10.1016/j.catena.2022.106846
通讯作者Wei, Xiaorong(xrwei78@163.com)
英文摘要Water-extractable organic matter (WEOM) is the most active and mobile fraction of soil organic matter and responds sensitively to soil erosion. However, previous studies on the chemical nature of WEOM in the erosion and deposition landscapes were controversial at site-level studies and mainly focused on surface soils, limiting our assessment of WEOM's environmental fate at larger and deeper scales. Here, we collected eroded soils and deposited sediments from a depth of 0-200 cm in five eroding catchments with an erosion intensity gradient across the Loess Plateau. We examined the concentration, composition, and potential sources of WEOM using UV-visible absorption and fluorescence excitation-emission matrix-parallel factor analysis. Soil WEOM quantity and quality varied significantly in the erosion and deposition landscapes, with greater variations in soils below 20 cm, where WEOM in the deposition zone was characterized by higher concentration, aromaticity, hydro-phobicity, and UVA and UVC humic-like components derived from terrestrial and soil organic matter. WEOM variations in deep soils increased with increasing erosion modulus among sites, and were mainly driven by changes in soil organic carbon concentration, aggregate stability, and carbon to nitrogen ratio. However, the pattern of WEOM parameters between erosion and deposition zones at 0-20 cm was opposite to that in soils below 20 cm. Vegetation inputs compensated the loss of organic matter in sites with suitable climatic status and weak erosion, and led to higher concentrations and exogenous features of WEOM in the surface erosion area. Concludingly, the WEOM concentration, components, and sources differed significantly between erosion and deposition zones, and these differences, as well as their response to erosion intensity, revealed an opposing pattern in surface and deep soils.
WOS关键词DISSOLVED ORGANIC-MATTER ; SOIL CARBON LOSSES ; LAND-USE ; SOURCE IDENTIFICATION ; AGGREGATE STABILITY ; ERODED SEDIMENTS ; WATER EROSION ; FLUORESCENCE ; MINERALIZATION ; REPLACEMENT
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40020000] ; National Natural Science Foundation of China[42107344] ; National Natural Science Foundation of China[41977068] ; Program from Chinese Academy of Sciences[QYZDB-SSW-DQC039] ; China Postdoctoral Science Foundation[2021T140558] ; China Postdoctoral Science Foundation[2020M683699XB] ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau[A314021402-202106]
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
出版者ELSEVIER
WOS记录号WOS:000912945300001
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Program from Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau
源URL[http://ir.igsnrr.ac.cn/handle/311030/189061]  
专题中国科学院地理科学与资源研究所
通讯作者Wei, Xiaorong
作者单位1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China
2.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Peoples R China
3.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
4.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China
5.Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Carr, Xian 710127, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Yufei,Wei, Xiaorong,Kong, Weibo,et al. Variations in the concentration, composition, and sources of WEOM in erosion and deposition landscapes over an erosion intensity gradient on the Loess Plateau of China[J]. CATENA,2023,222:13.
APA Yao, Yufei.,Wei, Xiaorong.,Kong, Weibo.,Li, Ming.,Wang, Zhe.,...&Shao, Mingan.(2023).Variations in the concentration, composition, and sources of WEOM in erosion and deposition landscapes over an erosion intensity gradient on the Loess Plateau of China.CATENA,222,13.
MLA Yao, Yufei,et al."Variations in the concentration, composition, and sources of WEOM in erosion and deposition landscapes over an erosion intensity gradient on the Loess Plateau of China".CATENA 222(2023):13.

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来源：地理科学与资源研究所

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