干旱区生态环境知识资源中心(Arid): Dissimilar evolution of soil dissolved organic matter chemical properties during revegetation with arbor and shrub in desertified land of the Mu Us Desert

Arid

DOI	10.1016/j.scitotenv.2021.152904
	Dissimilar evolution of soil dissolved organic matter chemical properties during revegetation with arbor and shrub in desertified land of the Mu Us Desert
	Zhang, Dongxu; Chen, Xiaoyu; Fu, Guangjun; Yang, Zhou; Song, Jia; Tong, Xiaogang
通讯作者	Tong, XG
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2022
卷号	815
英文摘要	The chemistry of dissolved organic matter (DOM) in soil determines its bioavailability and is crucial to soil nutrient cycling and vegetation restoration. However, the response of DOM to revegetation in degraded ecosystems is not well understood. This study analyzed soil chronosequences from semifixed (SF) sand in the Mu Us Desert, China that was afforested with arbor and shrub 23-54 years ago. The DOM organic composition and chemical properties were investigated by fluorescence excitation-emission matrix spectrophotometry and UV-visible spectroscopy. As the revegetation progressed, DOM concentration at 0-20 cm continually increased. In arbor land, the DOM was mainly influenced by dissolved organic carbon, and the average concentration significantly increased from 67.5 to 203.2 mg C.kg(-1). In the shrubland, changes in DOM were mainly influenced by dissolved organic nitrogen, with the average concentration significantly increasing from 3.7 to 8.9 mg N.kg(-1). Arbor afforestation significantly increased the proportion of hydrophobic humic-like components (C1), with a decline in bioactive tryptophan-like components (C3) and higher DOM molecular complexity (i.e., higher molecular weight, aromaticity, and degree of humification). However, in shrubland, the proportions of C1 and C3 were significantly lower than those in arbor forest soil, with DOM molecular complexity slightly increased, and DOM tended to become more bioavailable over time. Linear regression analysis indicated that DOM rich in carbon had a high molecular complexity, while DOM rich in nitrogen is more bioavailable. These findings reveal a dissimilar evolution in the DOM composition and chemistry in the two forest types throughout the SF sand revegetation period. The DOM under arbor forest was more stable and conducive to soil organic matter sequestration, while the DOM under shrub forest contained more bioactive substances and was more favorable for nutrient cycling.
英文关键词	Dissolved organic matter Chemistry UV-visible absorbance EEM-PARAFAC Afforestation Desertification
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000743229400001
WOS关键词	FLUORESCENCE SPECTROSCOPY ; MOLECULAR-WEIGHT ; LITTER DECOMPOSITION ; FOREST SOILS ; DYNAMICS ; CARBON ; DEGRADABILITY ; DEGRADATION ; PLANT ; ZONE
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/2XILL650/376207
推荐引用方式 GB/T 7714	Zhang, Dongxu,Chen, Xiaoyu,Fu, Guangjun,et al. Dissimilar evolution of soil dissolved organic matter chemical properties during revegetation with arbor and shrub in desertified land of the Mu Us Desert[J],2022,815.
APA	Zhang, Dongxu,Chen, Xiaoyu,Fu, Guangjun,Yang, Zhou,Song, Jia,&Tong, Xiaogang.(2022).Dissimilar evolution of soil dissolved organic matter chemical properties during revegetation with arbor and shrub in desertified land of the Mu Us Desert.SCIENCE OF THE TOTAL ENVIRONMENT,815.
MLA	Zhang, Dongxu,et al."Dissimilar evolution of soil dissolved organic matter chemical properties during revegetation with arbor and shrub in desertified land of the Mu Us Desert".SCIENCE OF THE TOTAL ENVIRONMENT 815(2022).