Nitrogen addition stimulate random migration of plant community in a semiarid steppe

文献类型： 外文期刊

第一作者： Wang, Ping

作者： Wang, Ping;Ji, Baoming;Wang, Ping;Xu, Minjie;Yang, Wei;Liu, Wei;Zhang, Zijia;Fan, Yi;Zhang, Ximei;Bai, Keyu

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关键词： N addition; Semiarid steppe; Migration; Dispersal

期刊名称：GLOBAL ECOLOGY AND CONSERVATION （ 影响因子：2.526； 五年影响因子：3.202 ）

ISSN： 2351-9894

年卷期： 2021 年 26 卷

页码：

收录情况： SCI

摘要： Increasing atmospheric nitrogen (N) deposition causes profound changes in the plant community, significantly threatening the terrestrial ecosystem function and stability worldwide. Random migration is a primary determinant of plant community assembly in the neutral model. However, whether its role is affected by N deposition is obscure. Therefore, the effects of eight N application rates (0, 1, 2, 3, 5,10,15, and 20 g N m-2 yr-1) on the estimated migration rate of plant community were examined in a long-term field study in a semiarid steppe. Our results indicated that N addition significantly impacted the estimated migration rate (F = 4.89, P < 0.001) and positively correlated with the N application rate (r2 = 0.32, P < 0.001). By constructing a structural equation model, we observed that the effect of N addition was mainly mediated through soil pH, moisture, and fungi: bacteria ratio. Mantel test revealed that the estimated migration rate was correlated with the plant community composition in moderate-N (10, 15, and 20 g N m-2 yr-1) treatment, but not in control (0 g N m-2 yr-1) and low-N treatment (1, 2, 3 and 5 g N m-2 yr-1) groups. Overall, our findings highlight the key role of N addition on plant community migration. ? 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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