Changes in species abundances with short-term and long-term nitrogen addition are mediated by stoichiometric homeostasis

文献类型： 外文期刊

第一作者： Yang, Tian

作者： Yang, Tian;Gu, Qian;Yang, Yadong;Xu, Chong;Wu, Honghui;Yu, Qiang;Long, Min;Smith, Melinda D.;Vilonen, Leena;Smith, Melinda D.;Vilonen, Leena;He, Nianpeng;Xu, Chong;Zhao, Jinling;Jentsch, Anke

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关键词： Ecological stoichiometry; Global change; Ecosystem structure; Plant functional traits; Species dominance; Grassland ecosystems

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Background Increasing nitrogen (N) deposition has altered plant communities globally, however the changes in species abundances with short-term vs. long-term N enrichment remains unclear. Stoichiometric homeostasis, quantified by the homoeostatic regulation coefficient (H) is a key trait predictive of plant species dominance and species responses to short-term global changes. It is unknown whether H changes with N enrichment over time, thereby affecting species responses to long-term N addition. Methods Here we investigated three representative plant species how species dominance changed to short-term and long-term N addition with a field N addition experiment (2006-2013) in an Inner Mongolia grassland. Changes in species H with long-term N addition were analyzed using a sand culture experiment, and the correlation between species H and species abundances were explored to address the above research gaps. Results The abundance of Leymus chinensis decreased with short-term N addition, and increased with long-term N addition, while Chenopodium glaucum exhibited the opposite pattern. Cleistogenes squarrosa was only favored by 1-year N addition, and depressed by two or more years of N addition. The H values of L. chinensis and C. glaucum decreased significantly with long-term N addition, but did not change for C. squarrosa. The H values were significantly related with the abundance both in Control and long-term N addition treatments. Conclusion Species abundance had opposite responses to short-term vs. long-term N addition. The decrease of H suggested the nutrients use strategy became more progressive, which mediated the responses of species abundances to short- and long-term N addition.

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