Descriptive statistics of climate variables.

Descriptive statistics of climate variables: Annual mean; coefficient of variation of annual means () and coefficient of variation of monthly values () of precipitation (pre); potential evapotranspiration (pet); minimal, mean and maximal temperatures (respectively tmn, tmp and tmx); daily temperature amplitude (dtr); soil water content (swc); vapour pressure (vap); cloud cover (cld); and extraterrestrial solar radiation (sol). Coefficients of variations (standard deviation divided by the mean of the variable) of monthly climate time series are computed over the period of the CRU data (1901–2009). a Globale Ecological Zone defined by FAO [55]; TAr: Tropical rainforest; TAwa: Tropical moist deciduous forest; TAwb: Tropical dry forest; TM: Tropical mountain system; and SCf: Subtropical humid forest.

气候变量的描述性统计量包括：年平均值；降水（precipitation, pre）的年平均值变异系数（）与月值变异系数（）；潜在蒸散量（potential evapotranspiration, pet）；最低、平均和最高气温（分别记为tmn、tmp和tmx）；气温日较差（daily temperature amplitude, dtr）；土壤含水量（soil water content, swc）；水汽压（vapour pressure, vap）；云量（cloud cover, cld）；以及地外太阳辐射（extraterrestrial solar radiation, sol）。月气候时间序列的变异系数（即标准差与变量均值的比值）是基于CRU数据集的研究时段（1901–2009年）计算得到的。a 由联合国粮食及农业组织（Food and Agriculture Organization, FAO）[55]定义的全球生态区：热带常绿雨林（TAr: Tropical rainforest）、热带湿润落叶林（TAwa: Tropical moist deciduous forest）、热带干旱林（TAwb: Tropical dry forest）、热带山地系统（TM: Tropical mountain system）以及亚热带湿润林（SCf: Subtropical humid forest）。