干旱区生态环境知识资源中心(Arid): Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China

Arid

DOI	10.1016/j.catena.2022.106483
	Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China
	Wang, Xinwen; Liu, Ziqi; Xiong, Kangning; He, Qiufang; Li, Yuan; Li, Kaiping
通讯作者	Liu, ZQ ; Xiong, KN
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	217
英文摘要	Dissolved organic matter (DOM) has strong reactivity and migration ability, which affects biogeochemical processes such as nutrient cycling. Karst ecological vulnerability has been widely discussed. However, the characteristics of soil DOM, the main energy matrix of the soil, in the process of rocky desertification control have rarely been reported. This study examined the characteristics of DOM in shallow soil after vegetation restoration in a karst area. Soil samples of 5 vegetation restoration types (abandoned land, AL; grassland, GL; peanut cultivated land, PCL; Zanthoxylum bungeanum land, ZBL; forest, FS) and water samples from the drainage were collected. DOM in soils of different vegetation restoration types was characterized by UV-Vis absorption spectroscopy and fluorescence excitation emission matrix (EEM)-parallel factor analysis (PARAFAC), and the fluorescent components of DOM in the soil and water samples were identified. Redundancy analysis (RDA) was used to identify the controlling factors of optical soil DOM characteristics. The results showed the following: (1) the DOC/SOC < 0.40 +/- 0.04%, most HIX values < 3.0, most BIX values < 1 and the protein-like component ranged from 40 +/- 0.03% to 54 +/- 0.02%. These results indicate that the DOM content in the study area is low, and the soil has weak aromaticity and low humification. (2) Karst hydrodynamic processes control the migration and loss of DOM (the explanatory degree accounts for 23.53%). (3) In AL, the DOC/SOC is the lowest, and C3 (the molecular weight is the highest among the three components) accounted for the highest proportion compared to the other vegetation restoration types. Taken together, our results indicate that environmental and vegetation factors have important impacts on DOM migration. In rocky desertification areas with weak aromaticity and a low degree of humification, there is great potential for the soil to lose lightweight DOM. These results can help predict future changes in carbon allocation across landscapes due to changes in land use and hydrodynamic processes.
英文关键词	Dissolvedorganicmatter Fluorescence Vegetationrestoration Controlfactors Karst
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000822972200001
WOS关键词	CHEMICAL-COMPOSITION ; FLUORESCENCE SPECTROSCOPY ; OPTICAL-PROPERTIES ; CARBON STABILITY ; EEM-PARAFAC ; DOM ; NITROGEN ; QUANTITY ; ACCUMULATION ; CATCHMENT
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/2XILL650/392112
推荐引用方式 GB/T 7714	Wang, Xinwen,Liu, Ziqi,Xiong, Kangning,et al. Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China[J],2022,217.
APA	Wang, Xinwen,Liu, Ziqi,Xiong, Kangning,He, Qiufang,Li, Yuan,&Li, Kaiping.(2022).Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China.CATENA,217.
MLA	Wang, Xinwen,et al."Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China".CATENA 217(2022).