Response of alpine grassland to elevated nitrogen deposition and water supply in China

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• 作者：Kaihui Li (1)
  Xuejun Liu (1) (2)
  Ling Song (2) (3)
  Yanming Gong (1)
  Chunfang Lu (4)
  Ping Yue (1)
  Changyan Tian (1)
  Fusuo Zhang (2)
  
  1. Key Laboratory of Biogeography and Bioresource in Arid Land ; Xinjiang Institute of Ecology and Geography ; Chinese Academy of Sciences ; Urumqi ; 830011 ; China
  2. College of Resources and Environmental Sciences ; China Agricultural University ; Beijing ; 100193 ; China
  3. Key Laboratory of Mountain Surface Processes and Ecological Regulation ; Institute of Mountain Hazards and Environment ; Chinese Academy of Sciences ; Chengdu ; 610041 ; China
  4. Key Laboratory of Chemistry of Plant Resources in Arid Regions ; Xinjiang Technical Institute of Physics and Chemistry ; Chinese Academy of Sciences ; Urumqi ; 830011 ; China
  
• 关键词：Aboveground biomass ; Species richness ; Forbs ; Availability聽of nutrient and moisture ; Species productivity
• 刊名：Oecologia
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：177
• 期：1
• 页码：65-72
• 全文大小：312 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

Species composition and productivity are influenced by water and N availability in semi-arid grasslands. To assess the effects of increased N deposition and water supply on plant species composition and productivity, two field experiments with four N addition treatments, and three N and water combination treatments were conducted in alpine grassland in the mid Tianshan mountains, northwest China. When considering N addition alone, aboveground biomass (AGB) of forbs (FAGB) responded less to N addition than AGB of grasses (GAGB). GAGB increased as an effect of N combined with water addition but FAGB did not show such an effect, reflecting a stronger response of grasses to the interaction of water availability and N than forbs. Under all treatments, N allocation to the aboveground tissue did not change for either forbs or grasses. N deposition and water addition did not alter species richness in the present study. These results suggest that N addition generally promoted AGB but had little effect on species richness in wet years. Snowfall in winter combined with rainfall in the early growing season likely plays a critical role in regulating plant growth of the subsequent year in the alpine grassland.