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Effects of alpine meadow degradation on nitrifying and denitrifying microbial communities, and N2O emissions on the Tibetan Plateau

文献类型：期刊论文

作者Zhang, Lu1,3; Wang, Xiangtao4; Wang, Jie2; Wan, Qian2; Liao, Lirong1,3; Liu, Guobin2,3; Zhang, Chao2,3
刊名SOIL RESEARCH
出版日期2021-10-25
页码15
关键词alpine meadow denitrification functional genes functional microbial diversity meadow degradation gradient N2O emissions N-cycling nitrification partial least squares path model
ISSN号1838-675X
DOI10.1071/SR21097
通讯作者Zhang, Chao(zhangchaolynn@163.com)
英文摘要Meadow degradation is often accompanied by significant changes in nitrogen (N)-cycling and nitrous oxide (N2O) emission potential, and leads to challenges in meadow management. However, the mechanisms of soil N-cycling and N2O emissions remain poorly understood, especially in alpine ecosystems. In this study, we investigated the soil N-cycling process in four alpine meadows on the Tibetan Plateau along a degradation gradient using real-time quantitative polymerase chain reaction and amplicon sequencing to elucidate the mechanisms. Compared to non-degraded meadows, meadow degradation reduced N2O emissions by 38.5-140.2%. Meadow degradation reduced the abundance of amoA of ammonia-oxidising archaea (AOA) and ammonia-oxidising bacteria (AOB), whereas light and moderate degradation increased the abundance of genes nirS, nirK, and nosZ. Lightly degraded meadow exhibited the highest alpha-diversity of both nitrifiers and denitrifiers, but this higher diversity was not accompanied by higher N2O emissions, with only 32.3% of the microbial taxa identified as predictors of N2O emissions, suggesting that functional redundancy exists in the N-cycling process in meadow ecosystems. Nitrosospira and Mesorhizobium from the AOB and nirK communities, respectively, were identified as the key taxa that may contribute to N2O emissions. Soil properties, especially N reaction substrates, including ammonium-N, nitrate-N, dissolved organic N, and total N, were the primary drivers for N2O emissions via mediation of the N-cycling community, especially nitrifiers. Our results emphasised the importance of environmental factors in shaping nitrifying, denitrifying, and N2O emissions, providing insights for the restoration of degraded meadow ecosystems.
WOS关键词NITROUS-OXIDE ; FUNCTIONAL GENES ; SOIL-MOISTURE ; GAS FLUXES ; GRASSLAND ; DENITRIFICATION ; ABUNDANCE ; REDUCTION ; DIVERSITY ; BACTERIA
资助项目Natural Science Basic Research Program of Shaanxi Province[2019KJXX-081] ; Natural Science Basic Research Program of Shaanxi Province[2021JM605] ; National Natural Sciences Foundation of China[41771554] ; Chinese Universities Scientific Fund[2452018336]
WOS研究方向Agriculture
语种英语
WOS记录号WOS:000710422400001
出版者CSIRO PUBLISHING
资助机构Natural Science Basic Research Program of Shaanxi Province ; National Natural Sciences Foundation of China ; Chinese Universities Scientific Fund
源URL[http://ir.igsnrr.ac.cn/handle/311030/167318]  
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
3.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
4.Xizang Agr & Anim Husb Coll, Dept Anim Sci, Linzhi 860000, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Lu,Wang, Xiangtao,Wang, Jie,et al. Effects of alpine meadow degradation on nitrifying and denitrifying microbial communities, and N2O emissions on the Tibetan Plateau[J]. SOIL RESEARCH,2021:15.
APA Zhang, Lu.,Wang, Xiangtao.,Wang, Jie.,Wan, Qian.,Liao, Lirong.,...&Zhang, Chao.(2021).Effects of alpine meadow degradation on nitrifying and denitrifying microbial communities, and N2O emissions on the Tibetan Plateau.SOIL RESEARCH,15.
MLA Zhang, Lu,et al."Effects of alpine meadow degradation on nitrifying and denitrifying microbial communities, and N2O emissions on the Tibetan Plateau".SOIL RESEARCH (2021):15.

入库方式： OAI收割

来源：地理科学与资源研究所

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