干旱区生态环境知识资源中心(Arid): Responses of soil dissolved organic carbon properties to the desertification of desert wetlands in the Mu Us Sandy Land

Arid

DOI	10.1016/j.jenvman.2024.120318
	Responses of soil dissolved organic carbon properties to the desertification of desert wetlands in the Mu Us Sandy Land
	Wang, Kun; Bi, Boyuan; Zhu, Kanghui; Wen, Miao; Han, Fengpeng
通讯作者	Han, FP
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	354
英文摘要	In desert wetlands, the decline in ground water table results in desertification, triggering soil carbon and nutrient loss. However, the impacts of desertification on soil dissolved organic carbon (DOC) properties which determine the turnover of soil carbon and nutrients are unclear. Here, the desertification gradient was represented by the distance from the wetland center (0 similar to 240 m) traversing reed marshes, desert shrubs and bare sandy land in the Hongjian Nur Basin, north China. Soil DOC properties were determined by ultraviolet and fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC). Results showed that soil DOC content decreased significantly from 107.23 mg kg(-1) to 8.44 mg kg(-1) by desertification (p < 0.05). However, the proportion of DOC to soil organic carbon (SOC) was gradually significantly increased. According to spectral parameters, microbial-derived DOC decreased from 0 to 120 m (reed marshes to desert shrubs) but increased from 120 to 240 m (desert shrubs to bare sandy lands), with a reverse hump-shaped distribution pattern. The molecular weight and aromaticity of DOC increased from 0 to 120 m but decreased from 120 to 240 m, with a hump -shaped distribution pattern. For the DOC composition, although the relative abundances of humic-acid components remained stable (p > 0.05), they were ultimately decreased by serious desertification and the amino acids became the dominant component. A similar change pattern was also found for humification index. Additionally, MBC and C:N were the two most important variables in determining the content and spectral properties, respectively. Together, these findings relationships between the soil DOC properties and desertification degree, especially the increase in DOC proportion and the decrease in humification degree, which may reduce soil C stabilization in the Hongjian Nur Basin.
英文关键词	Dissolved organic carbon Fluorescence spectroscopy Parallel factor analysis Desertification Desert wetland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001202732900001
WOS关键词	FLUORESCENCE EXCITATION ; EMISSION MATRIX ; N CONTENT ; MATTER ; GRASSLAND ; WATER ; STOICHIOMETRY ; ENVIRONMENT ; EXTRACTION ; GRADIENT
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404455
推荐引用方式 GB/T 7714	Wang, Kun,Bi, Boyuan,Zhu, Kanghui,et al. Responses of soil dissolved organic carbon properties to the desertification of desert wetlands in the Mu Us Sandy Land[J],2024,354.
APA	Wang, Kun,Bi, Boyuan,Zhu, Kanghui,Wen, Miao,&Han, Fengpeng.(2024).Responses of soil dissolved organic carbon properties to the desertification of desert wetlands in the Mu Us Sandy Land.JOURNAL OF ENVIRONMENTAL MANAGEMENT,354.
MLA	Wang, Kun,et al."Responses of soil dissolved organic carbon properties to the desertification of desert wetlands in the Mu Us Sandy Land".JOURNAL OF ENVIRONMENTAL MANAGEMENT 354(2024).