Correlation analyses among α, β, and γ diversity.

βC is Cody index, βS is Sørenson index, and βB–C is Bray-Curtis index in β-diversity. There are 7, 7 and 9 gradient belts with latitude, longitude and altitude, respectively. Simulated values of β-diversity are calculated with common functions of β = γ/α, β = γ–α, and β = 1–α/γ. α and γ diversity are recalculated basing on species number in each gradient belt. So 23 data are shown for each diversity. The data are correlation coefficients and the levels of correlation analyses are all significant (P

在β多样性（β-diversity）指标体系中，β_C代表科迪指数（Cody index），β_S代表索伦森指数（Sørenson index），β_B–C代表布雷-柯蒂斯指数（Bray–Curtis index）。纬度、经度与海拔对应的梯度带数量分别为7条、7条和9条。本研究采用β = γ/α、β = γ–α及β = 1–α/γ这三种常用计算公式，计算得到β多样性的模拟值。α多样性与γ多样性则依据各梯度带内的物种数重新计算得到。因此每种多样性指标均对应23组数据。本次数据为相关系数，且所有相关性分析均达到显著水平（P