Plant traits and soil fertility mediate productivity losses under extreme drought in C-3 grasslands

文献类型： 外文期刊

第一作者： Luo, Wentao

作者： Luo, Wentao;Ma, Wang;Liu, Bo;Wang, Zhengwen;Han, Xingguo;Griffin-Nolan, Robert J.;Zuo, Xiaoan;Xu, Chong;Yu, Qiang;Luo, Yahuang;Mariotte, Pierre;Smith, Melinda D.;Knapp, Alan K.;Smith, Melinda D.;Collins, Scott L.;Han, Xingguo;Han, Xingguo

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关键词： community-weighted traits; drought; functional dispersion; plant traits; productivity; soil fertility; species richness

期刊名称：ECOLOGY （ 影响因子：5.499； 五年影响因子：6.001 ）

ISSN： 0012-9658

年卷期： 2021 年 102 卷 10 期

页码：

收录情况： SCI

摘要： Extreme drought decreases aboveground net primary production (ANPP) in most grasslands, but the magnitude of ANPP reductions varies especially in C-3-dominated grasslands. Because the mechanisms underlying such differential ecosystem responses to drought are not well resolved, we experimentally imposed an extreme 4-yr drought (2015-2018) in two C-3 grasslands that differed in aridity. These sites had similar annual precipitation and dominant grass species (Leymus chinensis) but different annual temperatures and thus water availability. Drought treatments differentially affected these two semiarid grasslands, with ANPP of the drier site reduced more than at the wetter site. Structural equation modeling revealed that community-weighted means for some traits modified relationships between soil moisture and ANPP, often due to intraspecific variation. Specifically, drought reduced community mean plant height at both sites, resulting in a reduction in ANPP beyond that attributable to reduced soil moisture alone. Higher community mean leaf carbon content enhanced the negative effects of drought on ANPP at the drier site, and ANPP-soil-moisture relationships were influenced by soil C:N ratio at the wetter site. Importantly, neither species richness nor functional dispersion were significantly correlated with ANPP at either site. Overall, as expected, soil moisture was a dominant, direct driver of ANPP response to drought, but differential sensitivity to drought in these two grasslands was also related to soil fertility and plant traits.

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