Data from: Species richness effects on grassland recovery from drought depend on community productivity in a multisite experiment

Biodiversity can buffer ecosystem functioning against extreme climatic events, but few experiments have explicitly tested this. Here, we present the first multisite biodiversity × drought manipulation experiment to examine drought resistance and recovery at five temperate and Mediterranean grassland sites. Aboveground biomass production declined by 30% due to experimental drought (standardised local extremity by rainfall exclusion for 72–98 consecutive days). Species richness did not affect resistance but promoted recovery. Recovery was only positively affected by species richness in low-productive communities, with most diverse communities even showing overcompensation. This positive diversity effect could be linked to asynchrony of species responses. Our results suggest that a more context-dependent view considering the nature of the climatic disturbance as well as the productivity of the studied system will help identify under which circumstances biodiversity promotes drought resistance or recovery. Stability of biomass production can generally be expected to decrease with biodiversity loss and climate change.,biomass_1.2biomass per mesocosm and harvest and species (or community if no species-specific values available)NDVINDVI data per mesocosm and date,

生物多样性可缓冲生态系统功能以抵御极端气候事件，但目前鲜有实验对此开展过明确验证。本研究首次实施多站点生物多样性×干旱操控实验，在5处温带与地中海草原样地中探究生态系统的干旱抗性与恢复力。实验性干旱（通过连续72至98天排除降雨实现标准化本地极端干旱处理）使地上生物量产量下降30%。物种丰富度对干旱抗性无显著影响，但可促进恢复过程。仅在低生产力群落中，物种丰富度才对恢复过程产生正向影响，其中物种多样性最高的群落甚至表现出超补偿效应。该正向多样性效应可与物种响应的异步性相关联。本研究结果表明，若采用更具情境依赖性的研究视角，同时考量气候扰动的性质与研究系统的生产力水平，将有助于明确生物多样性在何种条件下可提升干旱抗性或恢复力。通常而言，随着生物多样性丧失与气候变化，生物量生产的稳定性或将下降。
数据集内容如下：1. biomass_1.2：每个中宇宙（mesocosm）在每次收获时对应物种的生物量（若无物种特异性数值则采用群落水平数据）；2. NDVI（归一化差异植被指数，Normalized Difference Vegetation Index）：每个中宇宙及对应日期的NDVI数据。