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Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau

文献类型：期刊论文

作者Chen, Hao1,2,3; Kong, Weidong1,3,4; Shi, Quan5; Wang, Fei1,4; He, Chen5; Wu, Jianshuang6,7; Lin, Qimei8; Zhang, Xianzhou7; Zhu, Yong-Guan9; Liang, Chao10
刊名JOURNAL OF APPLIED ECOLOGY
出版日期2021-12-30
页码11
关键词carbon storage degradability dissolved organic matter dryland soil microbial activity molecular composition Tibetan Plateau
ISSN号0021-8901
DOI10.1111/1365-2664.14105
通讯作者Kong, Weidong(wdkong@itpcas.ac.cn)
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.
WOS关键词RESONANCE MASS-SPECTROMETRY ; LITTER DECOMPOSITION ; SEMIARID ECOSYSTEMS ; CARBON ; PLANT ; BACTERIAL ; NITROGEN ; DYNAMICS ; BIOMASS ; INPUTS
资助项目National Natural Science Foundation of China[41771303] ; National Natural Science Foundation of China[32161123004] ; National Natural Science Foundation of China[42007047] ; Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0606] ; Chinese Academy of Sciences[XDA19070304] ; West Light Foundation of Interdisciplinary Team
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000736135500001
出版者WILEY
资助机构National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Chinese Academy of Sciences ; West Light Foundation of Interdisciplinary Team
源URL[http://ir.igsnrr.ac.cn/handle/311030/169142]  
专题中国科学院地理科学与资源研究所
通讯作者Kong, Weidong
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Resource, Beijing, Peoples R China
2.Sun Yat Sen Univ, Sch Agr, Guangzhou, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau, Key Lab Alpine Ecol, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
5.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing, Peoples R China
6.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China
7.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
8.China Agr Univ, Coll Land Sci & Technol, Beijing, Peoples R China
9.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing, Peoples R China
10.Chinese Acad Sci, Inst Appl Ecol, Shenyang, Peoples R China
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]. JOURNAL OF APPLIED ECOLOGY,2021:11.
APA Chen, Hao.,Kong, Weidong.,Shi, Quan.,Wang, Fei.,He, Chen.,...&Luo, Yu.(2021).Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau.JOURNAL OF APPLIED ECOLOGY,11.
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 (2021):11.

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来源：地理科学与资源研究所

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