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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

作者： Yang, Tian 1 ; Long, Min 2 ; Smith, Melinda D. 3 ; Gu, Qian 1 ; Yang, Yadong 1 ; He, Nianpeng 5 ; Xu, Chong 1 ; Wu, Hongh 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res St, Beijing 100081, Peoples R China

2.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

3.Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA

4.Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA

5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

6.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China

7.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China

8.Univ Bayreuth, Dept Disturbance Ecol, BayCEER, D-95440 Bayreuth, Germany

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

年卷期：

页码：

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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