Dataset of Rainy years counteract negative effects of drought on taxonomic, functional, and phylogenetic diversity: resilience in annual plant communities

Data used in the article: <strong>Rainy years counteract negative effects of drought on taxonomic, functional, and phylogenetic diversity: resilience in annual plant communities</strong> <strong>Abstract</strong> 1- Climate models forecast changes in the amounts and distribution of rain, which may affect ecosystems worldwide, especially in drylands where water is already the limiting factor for plant life. Annual plant communities are common in drylands where they can complete their entire life cycle during the rainy period while avoiding the dry season. Moreover, seed dormancy allows them to disperse over time by remaining in the seed bank for long periods. However, the extent to which these communities will be able to tolerate increasing drought is uncertain. 2- We performed a five-year rainfall reduction treatment under field conditions and determined its effects on annual plant communities in a Mediterranean gypsum ecosystem. We assessed the taxonomic, functional, and phylogenetic diversity of these communities each year for five years. 3-The taxonomic and functional diversity decreased under the rainfall reduction treatment whereas the phylogenetic diversity increased. Moreover, the relative importance of species with drought-resistant functional designs increased in the community assemblages. However, after a rainy season with above average rainfall, all of the diversity values recovered completely even under the rainfall reduction treatment. 4- Our results provide important insights into the responses of these plant communities under a climate change scenario, where they indicate high losses of diversity during drought events but rapid recovery in milder years. <em>Synthesis</em> Our findings highlight the great resilience of annual plant communities in drylands, which may allow them to tolerate increased drought under the present climate change scenario.本文所用数据源自以下文章：**《多雨年份抵消干旱对分类多样性（taxonomic diversity）、功能多样性（functional diversity）与系统发育多样性（phylogenetic diversity）的负面影响：一年生植物群落的恢复力》** **摘要** 1. 气候模型预测了降雨总量与分布格局的变化，该变化或影响全球各类生态系统，在水资源已成为植物生存限制因子的干旱区尤为显著。一年生植物群落在干旱区分布广泛，其可在雨季完成整个生活史以规避旱季。此外，种子休眠特性使其可长期留存于种子库中，实现跨时扩散。但目前尚不清楚这类群落对加剧干旱的耐受限度究竟如何。2. 本研究在野外条件下开展了为期5年的减雨处理实验，探究其对地中海石膏质生态系统中一年生植物群落的影响，并连续5年每年评估该群落的分类多样性、功能多样性与系统发育多样性。3. 减雨处理下，群落的分类多样性与功能多样性均出现下降，而系统发育多样性则有所上升。此外，具备耐旱功能性状的物种在群落组成中的相对重要性显著提升。但在降雨量高于常年平均水平的雨季过后，即便仍处于减雨处理条件下，所有多样性指标均完全恢复。4. 本研究结果为理解气候变化情景下这类植物群落的响应模式提供了重要参考：干旱事件会导致其多样性大幅损失，但在气候更为温和的年份可实现快速恢复。*综合与结论* 本研究结果凸显了干旱区一年生植物群落极强的恢复力，这使其可在当前气候变化情景下耐受加剧的干旱环境。