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Plant organic N uptake maintains species dominance under long-term warming
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نویسنده
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Lili Jiang ,Shiping Wang ,Pang Zhe ,Xingliang Xu ,Paul Kardol ,Yaoming Li ,Lirong Zhang ,Yanfen Wang ,Zhong Lei ,Zhichun Lan ,Paul W. Hill ,Zhenhua Zhang ,Caiyun Luo ,Yichao Rui ,Dong Ning ,Davey L. Jones
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منبع
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plant and soil - 2018 - دوره : 433 - شماره : 1-2 - صفحه:243 -255
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چکیده
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background: and aimsthere is ample experimental evidence for shifts in plant community composition under climate warming. to date, however, the underlying mechanisms driving these compositional shifts remain poorly understood. methods:the amount and form of nitrogen (n) available to plants are among the primary factors limiting productivity and plant coexistence in terrestrial ecosystems. we conducted a short-term 15n tracer experiment in a ten-year warming and grazing experiment in an alpine grassland to investigate the effects of warming and grazing on plant uptake of no3−-n, nh4+-n, and glycine-n. four dominant plant species (kobresia humilis, potentilla anseria, elymus nutans, poa annua) were selected. results: we found that 10-years of warming decreased plant uptake of inorganic n by up to 80% in all species. in contrast, warming increased the uptake of organic n in k. humilis, p. anseria, and e. nutans but not in p. annua. results: showed that plant relative biomass increased hyperbolically with the ratio of the plant species total uptake of available n and plant community uptake of available n. and a significant positive correlation between plant species uptake of soil glycine-n and the uptake of total available n. conclusion:sthe stable relative biomass of plant species is largely dependent on organic n uptake by plants. we conclude that plant organic n uptake maintains species dominance under long-term warming.
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کلیدواژه
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Plant N uptake ,Alpine grassland ,The Tibet plateau ,Plant species coexistence
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آدرس
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Chinese Academy of Sciences, Key Laboratory of Alpine Ecology, China, Chinese Academy of Sciences, Key Laboratory of Alpine Ecology, China. CAS Center for Excellence in Tibetan Plateau Earth Science of Chinese Academy of Sciences, China, University of Chinese Academy of Sciences, China, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, China, Swedish University of Agricultural Sciences, Department of Forest Ecology and Management, Sweden, Chinese Academy of Sciences, Key Laboratory of Alpine Ecology, China, Chinese Academy of Sciences, Key Laboratory of Alpine Ecology, China, University of Chinese Academy of Sciences, China, University/China-Australia Centre for Sustainable Urban Development, China, Nanchang University, China, Bangor University, UK, Chinese Academy of Sciences, Key Laboratory of Adaptation and Evolution of Plateau Biota, China, Chinese Academy of Sciences, Key Laboratory of Adaptation and Evolution of Plateau Biota, China, University of Western Australia Faculty of Law, Australia, University of Reading, UK, Bangor University, UK
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Authors
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