Effects of elevated carbon dioxide and nitrogen addition on foliar stoichiometry of nitrogen and phosphorus of five tree species in subtropical model forest ecosystems

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• 作者：Wenjuan Huang^a ; ^b ; Guoyi Zhou^a ; Juxiu Liu^a ; ^{ljxiu@scbg.ac.cn} ; Deqiang Zhang^a ; Zhihong Xu^c ; Shizhong Liu^a
• 关键词：Foliar nitrogen ; Foliar phosphorus ; Stoichiometry ; N2 fixer ; Subtropics
• 刊名：Environmental Pollution
• 出版年：2012
• 期刊代码：28_02697491
• 类别：env
• 出版时间：September, 2012
• 卷：168
• 期：Complete
• 页码：113-120
• 文件大小：347 K

摘要

The effects of elevated carbon dioxide (CO₂) and nitrogen (N) addition on foliar N and phosphorus (P) stoichiometry were investigated in five native tree species (four non-N₂ fixers and one N₂ fixer) in open-top chambers in southern China from 2005 to 2009. The high foliar N:P ratios induced by high foliar N and low foliar P indicate that plants may be more limited by P than by N. The changes in foliar N:P ratios were largely determined by P dynamics rather than N under both elevated CO₂ and N addition. Foliar N:P ratios in the non-N₂ fixers showed some negative responses to elevated CO₂, while N addition reduced foliar N:P ratios in the N₂ fixer. The results suggest that N addition would facilitate the N₂ fixer rather than the non-N₂ fixers to regulate the stoichiometric balance under elevated CO₂.