干旱区生态环境知识资源中心(Arid): Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau

Arid

DOI	10.1111/1365-2664.14105
	Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau
	Chen, Hao; Kong, Weidong; Shi, Quan; Wang, Fei; He, Chen; Wu, Jianshuang; Lin, Qimei; Zhang, Xianzhou; Zhu, Yong-Guan; Liang, Chao; Luo, Yu
通讯作者	Kong, WD (corresponding author)，Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Resource, Beijing, Peoples R China. ; Kong, WD (corresponding author)，Chinese Acad Sci, Inst Tibetan Plateau, Key Lab Alpine Ecol, Beijing, Peoples R China. ; Kong, WD (corresponding author)，Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China.
来源期刊	JOURNAL OF APPLIED ECOLOGY
ISSN	0021-8901
EISSN	1365-2664
出版年	2022
卷号	59 期号:3
英文摘要	Dryland soils consistently exhibit a low capacity for the long-term accumulation and storage of organic matter, which has been primarily attributed to low plant biomass inputs under drought suppression. Whether, and how, soil organic matter (SOM) compositions contribute to the consistently low SOM storage have been puzzling. A fundamental understanding of this mechanism is particularly essential to achieve the aspiration of '4 per mille Soils for Food Security and Climate'. By screening the molecular composition of dissolved organic matter (DOM), the gatekeeper of SOM decomposition, we explored the transformation processes among the pools of SOM, DOM and microbial biomass carbon (MBC) in soils along a precipitation gradient on dryland grasslands of the Tibetan Plateau. The results revealed that the number and mean weight of DOM molecules significantly decreased, and the soil DOM composition gradually shifted to be more labile along the transition from meadow, steppe, to desert with decreasing precipitation, coinciding with the substantial reduction in SOM. Compared with meadow soils, DOM degradability increased by 8.7% in steppe soils and by 23.4% in desert soils. The ratio of soil MBC to total organic carbon was threefold higher in desert than in meadow, and positively correlated with DOM degradability, indicating that labile DOM accelerated microbial growth and SOM decomposition in desert soils. Structural equation model and correlation analyses demonstrated that the DOM degradability was primarily controlled by soil dissolved nitrogen and soil organic C and soil DOC/DN ratio. Synthesis and application. This study at a molecular level provides a novel insight into the important role of the degradability of dissolved organic matter in carbon accumulation in dryland soils with consistently low organic matter storage. The findings will inform better global managements of soil organic matter under consideration of both food security and climate change.
英文关键词	carbon storage degradability dissolved organic matter dryland soil microbial activity molecular composition Tibetan Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000736135500001
WOS关键词	RESONANCE MASS-SPECTROMETRY ; LITTER DECOMPOSITION ; SEMIARID ECOSYSTEMS ; CARBON ; PLANT ; BACTERIAL ; NITROGEN ; DYNAMICS ; BIOMASS ; INPUTS
WOS类目	Biodiversity Conservation ; Ecology
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376858
作者单位	[Chen, Hao; Kong, Weidong; Wang, Fei] Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Resource, Beijing, Peoples R China; [Chen, Hao] Sun Yat Sen Univ, Sch Agr, Guangzhou, Peoples R China; [Chen, Hao; Kong, Weidong] Chinese Acad Sci, Inst Tibetan Plateau, Key Lab Alpine Ecol, Beijing, Peoples R China; [Kong, Weidong; Wang, Fei] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China; [Shi, Quan; He, Chen] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing, Peoples R China; [Wu, Jianshuang] Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China; [Wu, Jianshuang; Zhang, Xianzhou] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China; [Lin, Qimei] China Agr Univ, Coll Land Sci & Technol, Beijing, Peoples R China; [Zhu, Yong-Guan] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing, Peoples R China; [Liang, Chao] Chinese Acad Sci, Inst Appl Ecol, Shenyang...
推荐引用方式 GB/T 7714	Chen, Hao,Kong, Weidong,Shi, Quan,et al. Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau[J],2022,59(3).
APA	Chen, Hao.,Kong, Weidong.,Shi, Quan.,Wang, Fei.,He, Chen.,...&Luo, Yu.(2022).Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau.JOURNAL OF APPLIED ECOLOGY,59(3).
MLA	Chen, Hao,et al."Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau".JOURNAL OF APPLIED ECOLOGY 59.3(2022).