Linear regressions between soil water content and morphological traits (leaf mass per area, LMA and leaf density, LD) for deciduous species (dark line and circles), evergreens (red line and empty red circles) and all the species (dashed line).

The level of significance is expressed as follows: + 0.05 < P < 0.10, ** P < 0.01, *** P < 0.001.显著性水平的标注规则如下：+ 表示0.05 < P < 0.10，** 表示P < 0.01，*** 表示P < 0.001。