Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland

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• 作者：Lili Jiang ; Shiping Wang ; Zhe Pang ; Changshun Wang…
• 关键词：Organic N ; Inorganic N ; Alpine meadow ; Grazing ; Community succession ; Plant species coexistence ; Tibetan Plateau
• 刊名：Biology and Fertility of Soils
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：52
• 期：2
• 页码：211-221
• 全文大小：1,374 KB
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• 作者单位：Lili Jiang (1)
  Shiping Wang (1) (2)
  Zhe Pang (4)
  Changshun Wang (1)
  Paul Kardol (5)
  Xiaoqi Zhou (6)
  Yichao Rui (7)
  Zhi chun Lan (8)
  Yanfen Wang (4)
  Xingliang Xu (3)
  
  1. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China
  2. Center for Excellence in Tibetan Plateau Earth Science of the Chinese Academy of Sciences, Beijing, 100101, China
  4. College of Life Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
  5. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden
  6. Environmental Futures Research Institute, Griffith University, Nathan, Brisbane, 4111, Australia
  7. Soil Biology and Molecular Ecology Lab, School of Earth and Environment, The University of Western Australia, Crawley, WA, 6009, Australia
  8. Center for Watershed Ecology, Institute of Life Sciences, Nanchang University, Nanchang, 330031, China
  3. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Agriculture
  Soil Science and Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0789

文摘

To study how grazing affects the uptake of inorganic and organic N forms, three focal plant species (i.e., the graminoid species Kobresia pygmaea, which decreases with grazing, and the forbs Potentilla bifurca and Potentilla multifida, which increase with grazing) were selected in ungrazed and grazed plots in an alpine meadow on the Tibetan Plateau. Three times during the growing season (i.e., June, July, and September), these plots were injected with 15N-labeled NO₃ −-N, NH₄ +-N, or glycine-N, or with only water as a control. Two hours after 15N injection, exchangeable NH₄ +-N, glycine-N, and NO₃ −-N as well as plant and soil samples were collected and analyzed for 15N/14N and total N content. Our result showed that all three plant species took up glycine-N, but uptake of inorganic N was generally predominant. The graminoid K. pygmaea took up all three N forms equally in June but preferred NO₃ −-N in July (particularly under grazing) and exchangeable NH₄ +-N in September. The forbs P. bifurca and P. multifida preferentially took up exchangeable NH₄ +-N in July (particularly under grazing), while NO₃ −-N was the dominant form of N uptake in September. P. bifurca generally preferred exchangeable NH₄ +-N, but preference shifted toward NO₃ −-N under grazing in June. P. multifida preferred glycine-N in ungrazed plots and shifted its preference to NO₃ −-N under grazing in June. In conclusion, the three plant species showed niche partitioning for uptake of three forms of N across the season, which was modified by grazing. These findings indicate that plant N uptake patterns should be considered for better understanding the mechanisms of grazing effects on plant diversity and species coexistence. Keywords Organic N Inorganic N Alpine meadow Grazing Community succession Plant species coexistence Tibetan Plateau