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Alpine meadow degradation depresses soil nitrogen fixation by regulating plant functional groups and diazotrophic community composition

文献类型：期刊论文

作者Zhang, Lu1,2; Wang, Xiangtao3; Wang, Jie4; Liao, Lirong1,2; Lei, Shilong4; Liu, Guobin1,4; Zhang, Chao1,4
刊名PLANT AND SOIL
出版日期2022-01-04
页码17
ISSN号0032-079X
关键词Biological nitrogen fixation Alpine meadow nifH gene Diazotrophic community
DOI10.1007/s11104-021-05287-z
通讯作者Zhang, Chao(zhangchaolynn@163.com)
英文摘要Aims Biological nitrogen fixation (BNF), a function performed by diazotrophic microbes, plays an essential role in nitrogen (N) bioavailability in terrestrial ecosystems. However, little is known about the effects of meadow degradation on soil BNF and diazotrophic communities in alpine meadows. Methods We investigated changes in soil BNF and their potential drivers in alpine meadows along a degradation gradient on the Tibetan Plateau (non-degraded, lightly degraded, moderately degraded, and severely degraded meadows) using real-time quantitative PCR and amplicon sequencing. Results Soil BNF rates decreased significantly along the meadow degradation gradient with a range of 17.34-79.84 nmol C2H4 g(-1) dry soil d(-1) across all sites. The highest BNF rate in the non-degraded meadow was 1.5-4.6-fold higher than that in the degraded meadows. The abundance and diversity of diazotrophs measured by nifH abundance and Shannon diversity was also decreased in the degraded meadows, accompanied by decreases in plant biomass, soil moisture, and nutrient content (C, N). Soil BNF rate was correlated with plant biomass, soil nutrient content, and diazotrophic abundance (including Nostoc, Scytonema, Rhodopseudomonas, and unidentified genera within the Rhizobiales and Proteobacteria). The community composition of diazotrophs differed markedly among sites with different levels of degradation, with both autotrophic (Cyanobacteria) and heterotrophic (Proteobacteria) diazotrophs contributing significantly to BNF. The plant functional groups, particularly the sedge family, were the primary drivers of soil BNF rates via mediating soil moisture, nutrient content (dissolved organic C and N), nifH gene abundance, and diazotrophic community composition. Conclusions Our results reveal the main drivers of decreased BNF during alpine meadow degradation and emphasize the importance of plant functional groups in shaping the diazotrophic community and regulating the BNF rate. This information can be applied to the restoration of degraded meadow ecosystems.
WOS关键词BACTERIAL COMMUNITIES ; ABUNDANCE ; DENITRIFICATION ; BIODIVERSITY ; SUCCESSION ; GRADIENT
资助项目National Natural Sciences Foundation of China[42177449] ; West Light Foundation of the Chinese Academy of Sciences[XAB2020YN05] ; Strategic Priority Program of the Chinese Academy of Sciences (CAS)[XDA20040200] ; Natural Science Basic Research Program of Shaanxi Province[2019KJXX-081] ; Natural Science Basic Research Program of Shaanxi Province[2021JM-605] ; Chinese Universities Scientific Fund[2452018336]
WOS研究方向Agriculture ; Plant Sciences
语种英语
出版者SPRINGER
WOS记录号WOS:000737724000001
资助机构National Natural Sciences Foundation of China ; West Light Foundation of the Chinese Academy of Sciences ; Strategic Priority Program of the Chinese Academy of Sciences (CAS) ; Natural Science Basic Research Program of Shaanxi Province ; Chinese Universities Scientific Fund
源URL[http://ir.igsnrr.ac.cn/handle/311030/168889]  
专题中国科学院地理科学与资源研究所
通讯作者Zhang, Chao
作者单位1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Xizang Agr & Anim Husb Coll, Dept Anim Sci, Linzhi 860000, Peoples R China
4.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Lu,Wang, Xiangtao,Wang, Jie,et al. Alpine meadow degradation depresses soil nitrogen fixation by regulating plant functional groups and diazotrophic community composition[J]. PLANT AND SOIL,2022:17.
APA Zhang, Lu.,Wang, Xiangtao.,Wang, Jie.,Liao, Lirong.,Lei, Shilong.,...&Zhang, Chao.(2022).Alpine meadow degradation depresses soil nitrogen fixation by regulating plant functional groups and diazotrophic community composition.PLANT AND SOIL,17.
MLA Zhang, Lu,et al."Alpine meadow degradation depresses soil nitrogen fixation by regulating plant functional groups and diazotrophic community composition".PLANT AND SOIL (2022):17.

入库方式： OAI收割

来源：地理科学与资源研究所

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