Contrasting responses of early- and late-season plant phenophases to altered precipitation

We collected publications that focused on how the timing and duration of plant phenophases respond to altered precipitation in terrestrial ecosystems by searching the Web of Science and China’s National Knowledge Infrastructure. Here, we focused on how changes in precipitation amounts affected plant phenophases, including increased precipitation, decreased precipitation and both. The following search terms were used to find papers published before June 2022: (drought OR dry OR decreased precipitation OR water reduction OR increased precipitation OR water addition OR wet OR altered precipitation OR water treatment*) AND (bud* OR leaf-out OR leaf flushing OR leaf unfold* OR onset OR flowering OR anthesis OR fruiting OR ripen* OR seed OR maturity OR senescence OR leaf colour OR leaf colour OR brown OR yellow OR growing season OR reproducti* OR phenolog*) AND (experiment* OR control* OR treatment*). We then browsed these papers and selected studies meeting the following criteria: (a) At least one plant phenophase was considered; (b) initial environmental conditions including soil, vegetation, microclimate in controls were the same as in treatment plots; (c) number of days phenophases shifted were provided at the species level or could be calculated by comparing controls with treatments; (d) the methods used to alter precipitation in experiments were described; and (e) sample size was reported.

本研究通过检索Web of Science与中国知网（China National Knowledge Infrastructure）数据库，收集了聚焦于陆地生态系统中植物物候期（plant phenophases）的发生时间与持续时间如何响应降水改变的相关文献。本研究聚焦于降水量变化对植物物候期的影响，涵盖降水增加、降水减少以及二者兼具的情形。本次检索使用以下检索式筛选2022年6月之前发表的文献：（干旱 OR 干燥 OR 降水减少 OR 减水 OR 降水增加 OR 增水 OR 降水改变 OR 降水处理*） AND （芽* OR 展叶 OR 抽叶 OR 叶片展开* OR 始期 OR 开花 OR 盛花期 OR 坐果 OR 成熟* OR 种子 OR 成熟期 OR 衰老 OR 叶色 OR 叶色 OR 枯黄 OR 变黄 OR 生长季 OR 生殖* OR 物候*） AND （试验* OR 对照* OR 处理*）。随后，本研究对检索得到的文献进行逐一浏览，筛选符合以下标准的研究：（a）至少考量了一种植物物候期；（b）对照组样地与处理组样地的初始环境条件（包括土壤、植被、微气候）保持一致；（c）提供了物种水平上的物候期偏移天数，或可通过对比对照组与处理组数据计算得到该值；（d）详细描述了试验中改变降水的方法；（e）报告了样本量。