Dissolved organic matter in surface runoff in the Loess Plateau of China: The role of rainfall events and land-use

doi:10.1002/hyp.13660

	Dissolved organic matter in surface runoff in the Loess Plateau of China: The role of rainfall events and land-use
	Li, Zhongwu 1,3,5,6; Peng, Hao 1,4,5; Xie, Binggeng 3; Liu, Chun 2,6; Nie, Xiaodong 3; Wang, Danyang 1,5; Huang, Mei 1,5; Xiao, Haibing 6; Shi, Lin 4; Zhang, Xuqin 1,5
刊名	HYDROLOGICAL PROCESSES
	2020-02-05
页码	14
关键词	chemical composition dissolved organic matter land-use PARAFAC rainfall surface runoff
ISSN号	0885-6087
DOI	10.1002/hyp.13660
通讯作者	Xie, Binggeng(xbgyb1961@163.com) ; Liu, Chun(lspring@hnu.edu.cn)
英文摘要	Exploring the chemical characterization of dissolved organic matter (DOM) is important for understanding the fate of laterally transported organic matter in watersheds. We hypothesized that differences in water-extractable organic matter (WEOM) in soils of varying land uses and rainfall events may significantly affect the quality and the quantity of stream DOM. To test our hypotheses, characteristics of rainfall-runoff DOM and WEOM of source materials (topsoil from different land uses and gullies, as well as typical vegetation) were investigated at two adjacent catchments in the Loess Plateau of China, using ultraviolet-visible absorbance and excitation emission matrix fluorescence with parallel factor analysis (PARAFAC). Results indicated that land-use types may significantly affect the chemical composition of soil WEOM, including its aromaticity, molecular weight, and degree of humification. The PARAFAC analysis demonstrated that the soils and stream water were dominated by terrestrial/allochthonous humic-like substances and microbial transformable humic-like fluorophores. Shifts in the fluorescence properties of stream DOM suggested a pronounced change in the relative proportion of allochthonous versus autochthonous material under different rainfall patterns and land uses. For example, high proportions of forestland could provide more allochthonous DOM input. This study highlights the relevance of soils and hydrological dynamics on the composition and fluxes of DOM issuing from watersheds. The composition of DOM in soils was influenced by land-use type. Precipitation patterns influenced the proportion of terrestrial versus microbial origins of DOM in surface runoff. Contributions of allochthonous, terrestrially derived DOM inputs were highest from forested landscapes.
资助项目	China Postdoctoral Science Foundation[2018M643029] ; National Natural Science Foundation of China[41271294] ; Chinese Academy of Sciences
WOS关键词	UV-VISIBLE ABSORPTION ; SOURCE IDENTIFICATION ; ERODED SEDIMENTS ; CARBON ; FLUORESCENCE ; SOILS ; MANAGEMENT ; DYNAMICS ; NITROGEN ; CATCHMENT
WOS研究方向	Water Resources
语种	英语
出版者	WILEY
WOS记录号	WOS:000511212300001
资助机构	China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/132265]
专题	中国科学院地理科学与资源研究所
通讯作者	Xie, Binggeng; Liu, Chun
作者单位	1.Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha, Peoples R China 2.Jinan Univ, Inst Groundwater & Earth Sci, Guangzhou, Peoples R China 3.Hunan Normal Univ, Coll Resources & Environm Sci, Changsha, Peoples R China 4.Hunan Inst Water Resources & Hydropower Res, Inst Water Resources Dev & Planning, Changsha, Peoples R China 5.Hunan Univ, Coll Environm Sci & Engn, Changsha, Peoples R China 6.Chinese Acad Sci & Minist Water Resources, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhongwu,Peng, Hao,Xie, Binggeng,et al. Dissolved organic matter in surface runoff in the Loess Plateau of China: The role of rainfall events and land-use[J]. HYDROLOGICAL PROCESSES,2020:14.
APA	Li, Zhongwu.,Peng, Hao.,Xie, Binggeng.,Liu, Chun.,Nie, Xiaodong.,...&Jiang, Jieyu.(2020).Dissolved organic matter in surface runoff in the Loess Plateau of China: The role of rainfall events and land-use.HYDROLOGICAL PROCESSES,14.
MLA	Li, Zhongwu,et al."Dissolved organic matter in surface runoff in the Loess Plateau of China: The role of rainfall events and land-use".HYDROLOGICAL PROCESSES (2020):14.