Effects of extreme drought on plant nutrient uptake and resorption in rhizomatous vs bunchgrass-dominated grasslands

文献类型： 外文期刊

第一作者： Luo, Wentao

作者： Luo, Wentao;Ma, Wang;Liang, Xiaosa;Wang, Zhengwen;Han, Xingguo;Xu, Chong;Yu, Qiang;Yue, Xiyuan;Zuo, Xiaoan;Knapp, Alan K.;Smith, Melinda D.;Knapp, Alan K.;Smith, Melinda D.;Sardans, Jordi;Peuelas, Josep;Sardans, Jordi;Peuelas, Josep;Dijkstra, Feike A.;Bai, Yongfei;Han, Xingguo;Han, Xingguo

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关键词： Dominance/mass ratio hypothesis; Dominant species; Extreme drought; Nutrient cycling

期刊名称：OECOLOGIA （ 影响因子：3.225； 五年影响因子：3.665 ）

ISSN： 0029-8549

年卷期： 2018 年 188 卷 2 期

页码：

收录情况： SCI

摘要： Both the dominance and the mass ratio hypotheses predict that plant internal nutrient cycling in ecosystems is determined by the dominant species within plant communities. We tested this hypothesis under conditions of extreme drought by assessing plant nutrient (N, P and K) uptake and resorption in response to experimentally imposed precipitation reductions in two semiarid grasslands of northern China. These two communities shared similar environmental conditions, but had different dominant species-one was dominated by a rhizomatous grass (Leymus chinensis) and the other by a bunchgrass (Stipa grandis). Results showed that responses of N to drought differed between the two communities with drought decreasing green leaf N concentration and resorption in the community dominated by the rhizomatous grass, but not in the bunchgrass-dominated community. In contrast, negative effects of drought on green leaf P and K concentrations and their resorption efficiencies were consistent across the two communities. Additionally, in each community, the effects of extreme drought on soil N, P and K supply did not change synchronously with that on green leaf N, P and K concentrations, and senesced leaf N, P and K concentrations showed no response to extreme drought. Consistent with the dominance/mass ratio hypothesis, our findings suggest that differences in dominant species and their growth form (i.e., rhizomatous vs bunch grass) play an important nutrient-specific role in mediating plant internal nutrient cycling across communities within a single region.

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