Nitrogen Critical Loads for an Alpine Meadow Ecosystem on the Tibetan Plateau

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• 作者：Ning Zong ; Peili Shi ; Minghua Song ; Xianzhou Zhang ; Jing Jiang…
• 关键词：Alpine meadow ; Nitrogen critical loads ; Nitrogen deposition ; Plant community composition ; Qinghai ; Tibetan Plateau ; Soil characteristics
• 刊名：Environmental Management
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：57
• 期：3
• 页码：531-542
• 全文大小：967 KB
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• 作者单位：Ning Zong (1) (3)
  Peili Shi (1)
  Minghua Song (2)
  Xianzhou Zhang (1)
  Jing Jiang (4)
  Xi Chai (1) (3)
  
  1. Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang District, Beijing, 100101, China
  3. University of Chinese Academy of Sciences, Beijing, 100049, China
  2. Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
  4. Nanjing Agricultural Institute of Jiangsu Hilly Region, Nanjing, 210046, Jiangsu, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environmental Management
  Ecology
  Nature Conservation
  Atmospheric Protection, Air Quality Control and Air Pollution
  Forestry Management
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer New York
• ISSN：1432-1009

文摘

Increasing atmospheric nitrogen (N) deposition has the potential to alter plant diversity and thus the function and stability of terrestrial ecosystems. N-limited alpine ecosystems are expected to be particularly susceptible to increasing N deposition. However, little is known about the critical loads and saturation thresholds of ecosystem responses to increasing N deposition on the Tibetan Plateau, despite its importance to ecosystem management. To evaluate the N critical loads and N saturation thresholds in an alpine ecosystem, in 2010, we treated an alpine meadow with five levels of N addition (0, 10, 20, 40, and 80 kg N ha−1 year−1) and characterized plant and soil responses. The results showed that plant species richness and diversity index did not statistically vary with N addition treatments, but they both changed with years. N addition affected plant cover and aboveground productivity, especially for grasses, and soil chemical features. The N critical loads and saturation thresholds, in terms of plant cover and biomass change at the community level, were 8.8–12.7 and 50 kg N ha−1 year−1 (including the ambient N deposition rate), respectively. However, pronounced changes in soil inorganic N and net N mineralization occurred under the 20 and 40 kg N ha−1 year−1 treatments. Our results indicate that plant community cover and biomass are more sensitive than soil to increasing N inputs. The plant community composition in alpine ecosystems on the Qinghai-Tibetan Plateau may change under increasing N deposition in the future. Keywords Alpine meadow Nitrogen critical loads Nitrogen deposition Plant community composition Qinghai-Tibetan Plateau Soil characteristics