Climatic disequilibrium of recruit communities across a drought-induced die-off gradient in Mediterranean shrubland

Positive plant–plant interactions (facilitation) may enhance the recruitment and establishment of species less adapted to local macroclimatic conditions. A major cause of this effect is climatic buffering, which implies an increased mismatch between the macroclimatic conditions and the climatic requirements of the existing community – climatic disequilibrium – of plants living under canopies. Here we explore the effect of drought-induced defoliation of Mediterranean shrubland canopy on the recruitment of woody species. We analyzed the differences in the climatic disequilibrium across different categories of canopy defoliation and plant–plant interactions: facilitation, neutral and inhibition. Climatic disequilibrium was estimated as the Euclidean distance in the multivariate environmental space between observed macroclimate and community inferred climate. The inferred climate was calculated by averaging the coordinates of the species’ climatic niche centroids, obtained from species dist..., , , # DATASET DESCRIPTION

### \"species\_climatic\_niches.xlsx\" contains the centroids coordinates in the common climatic space (PCA1 and PCA2) for all the studied species.

. \"species\": valid scientific name of studied species
. \"centroid_pca1\": axis 1 coordinate in the common climatic space for each studied species
. \"centroid_pca2\": axis 2 coordinate in the common climatic space for each studied species

### \"recruitment\_data.xlsx\" for every recruit registered contains species, kind of interaction with canopy, kind of nurse (gap, alive, affected or dead canopy), number of recruits per plot, latitude and longitude of the plot and centroid coordinates of their climatic niche.

. \"plot\": identificator of each plot
. \"lat\": UTM latitude coordinate of each plot
. \"long\": UTM longitude coordinate of each plot
. \"species\": valid scientific name of studied species
. \"n\": number of recruits of each species belonging to each categorical group
. \"nurse\": description of the canopy cover category ex...

正种间植物相互作用（促进作用，facilitation）可提升对区域大气候适应性较弱的物种的幼苗补充与种群建群成功率。该效应的核心驱动机制为气候缓冲作用，即冠层下方生长的植物，其所处的大气候条件与现存群落的气候需求之间的错配程度加剧——此即气候失衡（climatic disequilibrium）。本研究针对地中海灌丛冠层因干旱诱导的落叶情况，探讨其对木本物种幼苗补充的影响，并分析不同冠层落叶等级以及植物间相互作用类型（促进、中性与抑制作用）下的气候失衡差异。气候失衡通过观测大气候与群落推断气候之间的多变量环境空间中的欧氏距离（Euclidean distance）进行估算；群落推断气候由各物种气候生态位（climatic niche）中心的坐标取平均得到，相关物种数据取自species dist..., , ,。

# 数据集说明
### "species_climatic_niches.xlsx" 包含所有研究物种在公共气候空间（PCA1与PCA2）中的生态位中心坐标。
· "species": 研究物种的有效学名
· "centroid_pca1": 各研究物种在公共气候空间中的主成分轴1坐标
· "centroid_pca2": 各研究物种在公共气候空间中的主成分轴2坐标

### "recruitment_data.xlsx" 针对每条已记录的幼苗补充样本，包含物种名称、与冠层的相互作用类型、保育体类型（林隙、存活冠层、受影响冠层或枯死冠层）、样地内的幼苗数量、样地经纬度以及其气候生态位中心坐标。
· "plot": 每个样地的标识符
· "lat": 各采样样地的UTM纬度坐标
· "long": 各采样样地的UTM经度坐标
· "species": 研究物种的有效学名
· "n": 属于每个分类组的对应物种的幼苗数量
· "nurse": 冠层覆盖等级的描述ex...