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The symbiotic nitrogen fixation by legumes in a legume-companion and a legume-dominant alpine steppe on the central Tibetan Plateau

文献类型：期刊论文

作者Xu-Ri1,2; Dai, Dongxue1,3; Xu, Xingliang4,5
刊名ECOLOGICAL RESEARCH
出版日期2021-04-07
页码11
关键词N-15 dilution technique alpine steppe legume-dominant community symbiotic nitrogen fixation Tibetan Plateau
ISSN号0912-3814
DOI10.1111/1440-1703.12221
通讯作者Xu-Ri(xu-ri@itpcas.ac.cn)
英文摘要Symbiotic N-2-fixing plant species occur in many stressful environments, including the central Tibetan Plateau, where the legume species Oxytropis microphylla, Oxytropis glacialis, Astragalus arnoldii occur in the alpine steppe at elevations as high as 4700 m above sea level, either as companion or as dominant species, accounting for 13.91-60.25% of the total aboveground steppe biomass. However, the degree to which they are nutritionally reliant upon symbiotic N-2 fixation is still unclear. We measured the symbiotic nitrogen fixation rate in a legume-companion (LC) and a legume-dominant (LD) alpine steppe community using the N-15 isotope dilution technique. The N derived from the atmosphere (%Ndfa) in the three legume species ranged from 17% to 61% in aboveground tissues and from 70% to 88% in belowground tissues. The N-2 fixation rate was estimated to be 0.25 +/- 0.04 and 1.39 +/- 0.20 g N m(-2) year(-1) for LC and LD based on the aboveground biomass. It was 0.86 +/- 0.04 and 2.77 +/- 0.22 gNm(-2) year(-1) for LC and LD, respectively, when both above and belowground tissues were considered. The total biological nitrogen fixation (BNF) of the alpine steppe on the Tibetan Plateau (ca. 0.7 million km(2)) can then be conservatively estimated at approximately 0.6 T g N year(-1) using the BNF estimate from the LC community. Our findings indicate that estimates based solely on aboveground biomass and LC communities might drastically underestimate the N inputs arising from BNF by legumes to the alpine ecosystem N budget.
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDA20050102] ; National Natural Scientific Foundation of China[41575152] ; National Natural Scientific Foundation of China[41775161] ; National Natural Scientific Foundation of China[42075164] ; China Scholarship Council[201704910347]
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000637476200001
出版者WILEY
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Scientific Foundation of China ; China Scholarship Council
源URL[http://ir.igsnrr.ac.cn/handle/311030/161844]  
专题中国科学院地理科学与资源研究所
通讯作者Xu-Ri
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Bldg 3,Courtyard 16,Lin Cui Rd, Beijing 100101, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing, Peoples R China
5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Xu-Ri,Dai, Dongxue,Xu, Xingliang. The symbiotic nitrogen fixation by legumes in a legume-companion and a legume-dominant alpine steppe on the central Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2021:11.
APA Xu-Ri,Dai, Dongxue,&Xu, Xingliang.(2021).The symbiotic nitrogen fixation by legumes in a legume-companion and a legume-dominant alpine steppe on the central Tibetan Plateau.ECOLOGICAL RESEARCH,11.
MLA Xu-Ri,et al."The symbiotic nitrogen fixation by legumes in a legume-companion and a legume-dominant alpine steppe on the central Tibetan Plateau".ECOLOGICAL RESEARCH (2021):11.

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来源：地理科学与资源研究所

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