Carbon and nitrogen allocation shifts in plants and soils along aridity and fertility gradients in grasslands of China
Carbon and nitrogen allocation shifts in plants and soils along aridity and fertility gradients in grasslands of China
复制标题
中国草原植物和土壤的碳氮分配随干旱和肥力梯度的变化
DOI：
10.1002/ece3.3245
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发表时间：
2017-07
影响因子：
2.6
通讯作者：
Jiang Y
中科院分区：
文献类型：
--
作者：
Luo WT;Li MH;Sardans J;Lu XT;Wang C;Penuelas J;Wang ZW;Han XG;Jiang Y
摘要植物碳(C)和氮(N)化学计量学在维持生态系统结构和功能方面起着重要作用。为了在次大陆尺度上解释环境变化对植物C、N化学计量学的影响，我们研究了中国草原2200公里气候梯度上两个广泛分布的优势属植物的地上部和根部C、N化学计量学。研究了土壤C、N浓度与土壤气候变量因子的关系。与以往的理论不同，地上部和根部的植物C浓度和C/N比都随着土壤肥力的增加而增加，随着干旱程度的增加而降低。随着干旱程度的增加，氮素的相对分配从土壤向植物转移，从根向地上部转移。C/N比的变化与N浓度的变化有关。植物C浓度和C/N比的动态变化主要是由植物-土壤系统中的生物量再分配和养分稀释效应引起的。我们的结果表明，在不断变化的环境下，C和N在不同生态系统中的分配可能会改变植物-土壤系统对这些元素的整体利用。
Abstract Plant carbon (C) and nitrogen (N) stoichiometry play an important role in the maintenance of ecosystem structure and function. To decipher the influence of changing environment on plant C and N stoichiometry at the subcontinental scale, we studied the shoot and root C and N stoichiometry in two widely distributed and dominant genera along a 2,200‐km climatic gradient in China's grasslands. Relationships between C and N concentrations and soil climatic variables factors were studied. In contrast to previous theory, plant C concentration and C:N ratios in both shoots and roots increased with increasing soil fertility and decreased with increasing aridity. Relative N allocation shifted from soils to plants and from roots to shoots with increasing aridity. Changes in the C:N ratio were associated with changes in N concentration. Dynamics of plant C concentration and C:N ratios were mainly caused by biomass reallocation and a nutrient dilution effect in the plant‐soil system. Our results suggest that the shifted allocation of C and N to different ecosystem compartments under a changing environment may change the overall use of these elements by the plant‐soil system.
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影响因子：
16.6
作者：
Zhiyou Yuan;Han Y. H. Chen;Han Y. H. Chen;P. B. Reich;P. B. Reich
通讯作者：
Zhiyou Yuan;Han Y. H. Chen;Han Y. H. Chen;P. B. Reich;P. B. Reich
DOI：
10.1515/9781400885695
发表时间：
2002-11
期刊：
--
影响因子：
--
作者：
R. Sterner;J. Elser
通讯作者：
R. Sterner;J. Elser
影响因子：
6.4
作者：
Yang, Yuanhe;Fang, Jingyun;Mohammat, Anwar
通讯作者：
Mohammat, Anwar
干旱半干旱草原控制生态系统氮循环的干旱阈值
影响因子：
16.6
作者：
Fang, Yunting;Cheng, Weixin;Luo, Wentao;Jiang, Ping;Shi, Jason;Yin, Huaqun;Zhou, Jizhong;Han, Xingguo;Bai, Edith
通讯作者：
Bai, Edith
影响因子：
6.2
作者：
Peng, Shushi;Piao, Shilong;Chen, Anping
通讯作者：
Chen, Anping