Variation in carbon, nitrogen and phosphorus partitioning between above- and belowground biomass along a precipitation gradient at Tibetan Plateau

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• 作者：Jiang-tao Hong ; Xiao-dan Wang ; Jian-bo Wu
• 关键词：Biomass allocation ; Nutrient concentration ; Qinghai ; Tibetan Plateau ; Alpine steppe ; Stipa purpurea
• 刊名：Journal of Mountain Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：13
• 期：4
• 页码：661-671
• 全文大小：2,306 KB
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• 作者单位：Jiang-tao Hong (1) (2)
  Xiao-dan Wang (1)
  Jian-bo Wu (1)
  
  1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  
• 刊物主题：Earth Sciences, general; Geography (general); Environment, general; Ecology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0321

文摘

Precipitation is a potential factor that significantly affects plant nutrient pools by influencing biomass sizes and nutrient concentrations. However, few studies have explicitly dissected carbon (C), nitrogen (N) and phosphorus (P) pools between above- and belowground biomass at the community level along a precipitation gradient. We conducted a transect (approx. 1300 km long) study of Stipa purpurea community in alpine steppe on the Tibet Plateau of China to test the variation of N pool of aboveground biomass/N pool of belowground biomass (AB/BB N) and P pool of aboveground biomass/P pool of belowground biomass (AB/BB P) along a precipitation gradient. The proportion of aboveground biomass decreased significantly from mesic to drier sites. Along the belt transect, the plant N concentration was relatively stable; thus, AB/BB N increased with moisture due to the major influences by above- and belowground biomass allocation. However, P concentration of aboveground biomass decreased significantly with increasing precipitation and AB/BB P did not vary with aridity because of the offset effect of the P concentration and biomass allocation. Precipitation gradients do decouple the N and P pool of a S. purpurea community along a precipitation gradient in alpine steppe. The decreasing of N:P in aboveground biomass in drier regions may indicate much stronger N limitation in more arid area.