干旱区生态环境知识资源中心(Arid): Spatial variation in dissolved organic matter in a vegetation-restored ephemeral gully on the semi-arid region

Arid

DOI	10.1016/j.catena.2023.107452
	Spatial variation in dissolved organic matter in a vegetation-restored ephemeral gully on the semi-arid region
	Chen, Guo; Wang, Hao; Li, Ming; Zhang, Qing-wei; Wang, Jian; Geng, Ren; He, Xiao-bing
通讯作者	Wang, H
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	232
英文摘要	Dissolved organic matter (DOM) is a crucial fraction of soil organic carbon, playing a key role in assessing soil quality. Nonetheless, the spatial variation characteristics of DOM in typical geomorphic units are not systematically understood. Accordingly, in this study, we selected the widely distributed vegetation-restored ephemeral gullies (EGs) in a typical semi-arid region, and sample points were arranged along the EG top (ET) and EG floor (EF) from the head to the end of the EGs with equal intervals. Soil samples were taken from the top soil layer (TL), middle soil layer (ML) and bottom soil layer (BL) at each sample point. Spatial variation characteristics and driving factors of DOM in the EGs were identified using 3D excitation emission matrix spectral, UV-visible spectral, parallel factor analysis, and principal component analysis. The results showed that the dissolved organic carbon (DOC) contents of the TL varied greatly with the distance from the EG head, but those of the ML and BL were kept stable for both the ET and EF. The DOC contents of the TL at the ET (103.29 mg kg-1) and EF (101.63 mg kg � 1) were 2.65, 4.10 and 2.20, 2.90 times higher than those of the ML and BL, respectively. The DOM of the EGs were primarily composed of humic acid-like substances (i.e., C1 and C2) and a protein-like substance (i.e., C3). The DOM of the TL and ML were organic matter with high aromaticity and molecular weight, while the DOM in the BL was lower in these two indexes for the EGs. The landscape location (i.e., ET and EF) only had a significant effect on the proportion of the C1, C2, and C3 of the ML. The variation in DOM characteristics on the EGs were highly ascribed to the differences in the accumulation or distribution of biocrusts, and plant litter and root.
英文关键词	Natural succession Steep slope Dissolved organic matter Biocrusts Semiarid regions
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001061645400001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; LAND-USE ; FLUORESCENCE SPECTROSCOPY ; LOESS PLATEAU ; SIZE DISTRIBUTION ; CARBON ; LITTER ; DYNAMICS ; EROSION ; RUNOFF
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395712
推荐引用方式 GB/T 7714	Chen, Guo,Wang, Hao,Li, Ming,et al. Spatial variation in dissolved organic matter in a vegetation-restored ephemeral gully on the semi-arid region[J],2023,232.
APA	Chen, Guo.,Wang, Hao.,Li, Ming.,Zhang, Qing-wei.,Wang, Jian.,...&He, Xiao-bing.(2023).Spatial variation in dissolved organic matter in a vegetation-restored ephemeral gully on the semi-arid region.CATENA,232.
MLA	Chen, Guo,et al."Spatial variation in dissolved organic matter in a vegetation-restored ephemeral gully on the semi-arid region".CATENA 232(2023).