Water availability modifies productivity response to biodiversity and nitrogen in long‐term grassland experiments
Water availability modifies productivity response to biodiversity and nitrogen in long‐term grassland experiments
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在长期草原实验中，水的可用性改变了生产力对生物多样性和氮的响应
DOI：
10.1002/eap.2363
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发表时间：
2021
影响因子：
5
通讯作者：
Wei, Xiaojing
中科院分区：
文献类型：
--
作者：
Kazanski, Clare E.;Cowles, Jane;Dymond, Salli;Clark, Adam T.;David, Aaron S.;Jungers, Jacob M.;Kendig, Amy E.;Riggs, Charlotte E.;Trost, Jared;Wei, Xiaojing
多样性和氮添加与植物生产力有着积极的关系，但气候引起的水资源可用性变化可能会颠覆这些既定的关系。使用长期数据从三个实验在一个中型草原（范围从17到34年的数据），我们测试了物种丰富度和氮添加对群落水平的植物生产力的影响如何改变作为一个函数的水可用性的年度波动使用生长季降水和标准化降水-蒸散指数（SPEI）。虽然实验结果各不相同，但我们的研究结果表明，水的可用性可以放大生物多样性和氮添加对生产力的积极影响。这些结果表明，生产力对人为物种多样性损失和氮沉降增加的反应可能取决于降水制度，突出了测试多个全球变化驱动因素之间的相互作用的重要性。
Diversity and nitrogen addition have positive relationships with plant productivity, yet climate‐induced changes in water availability threaten to upend these established relationships. Using long‐term data from three experiments in a mesic grassland (ranging from 17 to 34 yr of data), we tested how the effects of species richness and nitrogen addition on community‐level plant productivity changed as a function of annual fluctuations in water availability using growing season precipitation and the Standardized Precipitation‐Evapotranspiration Index (SPEI). While results varied across experiments, our findings demonstrate that water availability can magnify the positive effects of both biodiversity and nitrogen addition on productivity. These results suggest that productivity responses to anthropogenic species diversity loss and increasing nitrogen deposition could depend on precipitation regimes, highlighting the importance of testing interactions between multiple global change drivers.