干旱区生态环境知识资源中心(Arid): Chemical characterization and source identification of organic matter in eroded sediments: Role of land use and erosion intensity

Arid

DOI	10.1016/j.chemgeo.2018.12.040
	Chemical characterization and source identification of organic matter in eroded sediments: Role of land use and erosion intensity
	Liu, Chun 1,2,3,4,5; Li, Zhongwu 1,2,3,4; Berhe, Asmeret Asefaw 5; Zeng, Guangming 2,3; Xiao, Haibing 4; Liu, Lin 4; Wang, Danyang 2,3; Peng, Hao 2,3
通讯作者	Li, Zhongwu
来源期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
EISSN	1872-6836
出版年	2019
卷号	506 页码:97-112
英文摘要	Soil erosion is a key variable in the biogeochemical cycle of carbon (C) on the Earth's surface. However, questions remain about the roles of land use and erosion intensity on the composition, source, and fate of soil C eroded from terrestrial to fluvial systems. In this study, chemical characteristics of eroded water-extractable organic matter (WEOM) in soils and sediments, as well as subsequent source identification, were inferred from UV-Visible absorption and fluorescence excitation emission matrix (EEM)-parallel factor analysis (PARAFAC) in study sites that include land uses and gully banks, experiencing three levels of erosion intensity in a semi-arid region of China. C-13 and N-15 isotopic signatures along with elemental ratios were also successfully employed to explore the source of bulk soil organic matter (SOM) in sediments. We found a much greater contribution of condensed aromatic structures and hydrophobic fraction of soluble organic compounds in forest soils compared to croplands at eroding sites, where these variables were greater than those of depositional sites. The results from fluorescence analysis in soil materials showed that erosion intensity has a negligible influence on WEOM quality. The EEM-PARAFAC with fluorescence indices indicated that biological production of soil substrates can also play a key role in the dynamics of WEOM induced by soil erosion. Our results from an isotopic mixing model analysis showed that gully bank soil was the primary sources of sedimentary SOM in all regions with different erosion intensities (mean probability estimate (MPE) 100% for the region with light erosion intensity, 36.18% for the region with high erosion intensity, and 99.25% for the region with extremely high erosion intensity). However, orchard and grassland were also the main contributors for the SOM in sediments in regions with high erosion intensity, accounting for MPE 29.93% and 33.89%, respectively. Our findings demonstrate that land use and erosion intensity have significant effect on nature of eroded OM.
英文关键词	Soil erosion Source fingerprinting Fate of eroded OM Land use
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000456708100009
WOS关键词	SOIL CARBON SEQUESTRATION ; FLUORESCENCE EEM-PARAFAC ; HILLY-GULLY CATCHMENT ; TOTAL NITROGEN STOCKS ; LOESS PLATEAU ; AQUATIC ENVIRONMENTS ; SPECTROSCOPIC INDEXES ; OPTICAL-PROPERTIES ; MOLECULAR-WEIGHT ; RAMAN SCATTER
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214868
作者单位	1.Hunan Normal Univ, Coll Resources & Environm Sci, Changsha 410081, Hunan, Peoples R China; 2.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China; 3.Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China; 4.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; 5.Univ Calif, Life & Environm Sci Unit, Merced, CA 95343 USA
推荐引用方式 GB/T 7714	Liu, Chun,Li, Zhongwu,Berhe, Asmeret Asefaw,et al. Chemical characterization and source identification of organic matter in eroded sediments: Role of land use and erosion intensity[J]. 西北农林科技大学,2019,506:97-112.
APA	Liu, Chun.,Li, Zhongwu.,Berhe, Asmeret Asefaw.,Zeng, Guangming.,Xiao, Haibing.,...&Peng, Hao.(2019).Chemical characterization and source identification of organic matter in eroded sediments: Role of land use and erosion intensity.CHEMICAL GEOLOGY,506,97-112.
MLA	Liu, Chun,et al."Chemical characterization and source identification of organic matter in eroded sediments: Role of land use and erosion intensity".CHEMICAL GEOLOGY 506(2019):97-112.