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Denitrification is the main microbial N loss pathway on the Qinghai-Tibet Plateau above an elevation of 5000 m
Wang, Shanyun; Liu, Weiyue; Zhao, Siyan; Wang, Cheng; Zhuang, Linjie; Liu, Lu; Wang, Weidong; Lu, Yonglong; Li, Fangbai; Zhu, Guibing
2019-12-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume696Pages:-
AbstractSoil nitrogen (N) deficiency is the major factor contributing to low primary productivity on the Qinghai-Tibet Plateau. However, most of our understanding of N cycling is still based on human disturbed environments, and the microbial mechanisms governing N loss in low primary productivity environment remain unclear. This study explores three microbial N loss pathways in eight wetland and dryland soil profiles from the Qinghai-Tibet Plateau, at an elevation of above 5000 m with little human activity, using N-15 isotopic tracing slurry technology, quantitative PCR, and high-throughput sequencing. No denitrifying anaerobic methane oxidation was detected. Anammox occurred in two of the wetland (n = 4) and dryland (n = 4) soil profiles, while denitrification widely occurred and was the dominant N loss pathway in all samples. Where denitrification and anammox co-occurred, both abundance and activity were higher in wetland than in dryland soils and higher in surface than in subsurface soils. In comparison with non-anammox sites, nitrate levels initiate anammox-related N cycling. High-throughput sequencing and network analysis of nirK, nirS, nosZ, and hzsB gene communities showed that Bradyrhizobiaceae (a family of rhizobia) may play a dominant role in N loss pathways in this region. Given the geological evolution and relatively undisturbed habitat, these findings strongly suggest that denitrification is the dominant N loss pathway in terrestrial habitats of the Qing-Tibet Plateau with minimal anthropogenic activity. (C) 2019 Elsevier B.V. All rights reserved.
Department环境水质学国家重点实验室
KeywordDenitrification Anammox DAMO Soil profile Qinghai-Tibet plateau N cycle
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42637
Collection环境水质学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Guangdong Inst Ecoenvironm Sci & Technol, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangzhou 510650, Guangdong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Shanyun,Liu, Weiyue,Zhao, Siyan,et al. Denitrification is the main microbial N loss pathway on the Qinghai-Tibet Plateau above an elevation of 5000 m[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,696:-.
APA Wang, Shanyun.,Liu, Weiyue.,Zhao, Siyan.,Wang, Cheng.,Zhuang, Linjie.,...&Zhu, Guibing.(2019).Denitrification is the main microbial N loss pathway on the Qinghai-Tibet Plateau above an elevation of 5000 m.SCIENCE OF THE TOTAL ENVIRONMENT,696,-.
MLA Wang, Shanyun,et al."Denitrification is the main microbial N loss pathway on the Qinghai-Tibet Plateau above an elevation of 5000 m".SCIENCE OF THE TOTAL ENVIRONMENT 696(2019):-.
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