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Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation

文献类型：期刊论文

作者Zong, Ning1; Song, Minghua1; Zhao, Guangshuai2; Shi, Peili1,3
刊名ECOLOGY AND EVOLUTION
出版日期2020-01-27
页码11
关键词Alpine grassland biological nitrogen fixation legume species nitrogen resorption efficiency precipitation gradient
ISSN号2045-7758
DOI10.1002/ece3.6038
通讯作者Zong, Ning(zongning@igsnrr.ac.cn) ; Shi, Peili(shipl@igsnrr.ac.cn)
英文摘要Nitrogen (N) is one of the most important factors limiting plant productivity, and N fixation by legume species is an important source of N input into ecosystems. Meanwhile, N resorption from senescent plant tissues conserves nutrients taken up in the current season, which may alleviate ecosystem N limitation. N fixation was assessed by the N-15 dilution technique in four types of alpine grasslands along the precipitation and soil nutrient gradients. The N resorption efficiency (NRE) was also measured in these alpine grasslands. The aboveground biomass in the alpine meadow was 4-6 times higher than in the alpine meadow steppe, alpine steppe, and alpine desert steppe. However, the proportion of legume species to community biomass in the alpine steppe and the alpine desert steppe was significantly higher than the proportion in the alpine meadow. N fixation by the legume plants in the alpine meadow was 0.236 g N/m(2), which was significantly higher than N fixation in other alpine grasslands (0.041 to 0.089 g N/m(2)). The NRE in the alpine meadows was lower than in the other three alpine grasslands. Both the aboveground biomass and N fixation of the legume plants showed decreasing trends with the decline of precipitation and soil N gradients from east to west, while the NRE of alpine plants showed increasing trends along the gradients, which indicates that alpine plants enhance the NRE to adapt to the increasing droughts and nutrient-poor environments. The opposite trends of N fixation and NRE along the precipitation and soil nutrient gradients indicate that alpine plants adapt to precipitation and soil nutrient limitation by promoting NRE (conservative nutrient use by alpine plants) rather than biological N fixation (open sources by legume plants) on the north Tibetan Plateau.
WOS关键词NUTRIENT RESORPTION ; PRECIPITATION GRADIENT ; PHOSPHORUS RESORPTION ; SEMIARID GRASSLAND ; CARBON ; WATER ; RESPONSES ; PATTERNS ; TRAITS ; EFFICIENCIES
资助项目National Key Research and Development Program[2016YFC0501803] ; National Key Research and Development Program[2017YFA0604802] ; National Natural Science Foundation of China[41703079] ; National Natural Science Foundation of China[31870406] ; West Light Foundation of the Chinese Academy of Sciences ; Tibetan Major Scientific and Technological Project[Z2016C01G01]
WOS研究方向Environmental Sciences & Ecology ; Evolutionary Biology
语种英语
WOS记录号WOS:000509469900001
出版者WILEY
资助机构National Key Research and Development Program ; National Natural Science Foundation of China ; West Light Foundation of the Chinese Academy of Sciences ; Tibetan Major Scientific and Technological Project
源URL[http://ir.igsnrr.ac.cn/handle/311030/131538]  
专题中国科学院地理科学与资源研究所
通讯作者Zong, Ning; Shi, Peili
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing, Peoples R China
2.Natl Forestry & Grassland Adm, China Natl Forestry Grassland Econ & Dev Res Ctr, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zong, Ning,Song, Minghua,Zhao, Guangshuai,et al. Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation[J]. ECOLOGY AND EVOLUTION,2020:11.
APA Zong, Ning,Song, Minghua,Zhao, Guangshuai,&Shi, Peili.(2020).Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation.ECOLOGY AND EVOLUTION,11.
MLA Zong, Ning,et al."Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation".ECOLOGY AND EVOLUTION (2020):11.

入库方式： OAI收割

来源：地理科学与资源研究所

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