广东省山茶科物种丰富度水平地带性格局分析

Study on Horizontal Zonal Pattern of Theaceous Plant Species Richness in Guangdong Province

通过分析广东省山茶科125种植物物种丰富度水平地带性格局,并对其进行环境解释,利用软件DMAP将广东省划分为72个0.5°×0.5°的经纬度网格,并将基于网格的物种丰富度表现出来,同时利用箱形图分析其水平分布格局。结果表明:广东省山茶科植物的分布中心位于粤北山区,表现出显著的经度(P=0.001 2)、纬度(P=0.004 9)地带性差异。对125种植物、72个网格和6个环境因子进行典范对应分析(CCA)表明:CCA排序轴第1轴主要代表温度的变化梯度,第2轴主要代表水分的变化梯度,说明水分、温度等因素共同影响山茶科植物在广东的生长和分布,其中年均最低温度是影响广东省山茶科植物丰富度水平地带性格局的最大因子。

The horizontal zonal pattern of Theaceae plant species richness in Guangdong Province and its relation to the environmental factors were studied. Both data of species distribution and environmental factors were tabulated based on a digitized map of Guangdong Province gridded at 0.5° latitude×0.5° longitude. Grid-based richness was mapped using DMAP, a distribution mapping program, and horizontal patterns were assessed using F tests. The richness center of the Theaceae plant species under study is located in the mountainous area of north Guangdong （22.5°N, and 112 ～115°E）. These plants species exhibited significant longitudinal difference （P =0. 001 2）, and latitudinal variation （P =0.004 9）. Canonical Correspondence Analysis （CCA） showed the distribution of plant species could be explained by caloric factors and moisture factors, and MAMI （mean annual minimum temperature） was the key factor determining the distribution pattern of Theaceae plant species richness in the study area.