中国鼠李科植物空间分布多样性研究

Studies on Spatial Distribution Diversity of Rhamnaceae in China

利用ArcGIS软件,以中国鼠李科植物属、种分布数量数据为基础,制作属、种空间分布多样性图,计算空间分布多样性格局指数,分析中国鼠李科植物属、种的空间分布多样性特点。通过量化研究,得出鼠李科植物空间分布多样性的数量特点和规律。结果表明:(1)云南景洪市为中国鼠李科植物属、种分布中心,云南东南部、广西西南及西北部和贵州西南部的属、种数量较多,是中国鼠李科植物多样性的重要分布及保护地区。(2)西藏南部及东南部、青海东部和甘肃中部成为鼠李科植物分布的分界线,分界线以西鼠李科植物呈零星分布或没有分布,分界线以东呈连续分布。(3)中国鼠李科植物空间分布多样性格局各指标中,种的各项指标均大于属的相应值;当属数和种数均为1时,其斑块数量、类型所占面积、面积占景观的比例、最大斑块指数、景观形状指数均最大,当属数和种数逐渐增加,所有指标值均呈递减趋势。

Spatial distribution diversity of Rhamnaceae in China were based on the distribution data of genera and species number of Rhamnaceae in China.Maps of spatial distribution diversity of genera and species were made in ArcGIS software.Indices of spatial distribution diversity patterns were calculated.Spatial distribution diversity characteristics of genera and species in Rhamnaceae were analyzed.Spatial distribution diversity patterns of Rhamnaceae in China were obtained by quantitative study.Results showed that:(1)Jinghong city,yunnan province is the center of genera and species distribution in China.There are many genera and species in southeast of Yunnan,southwest and northwest of Guangxi and southwest of Guizhou,which are important distribution and protection areas of Rhamnaceae in China.(2)South and southeast of Tibet,the east of Qinghai and the central of Gansu have become the dividing lines of the distribution of Rhamnaceae in China.To the west of the dividing line,the distribution of Rhamnaceae in China is scattered or absent,while to the east of the dividing line,the distribution is continuous.(3)Among the indices of spatial distribution diversity patterns of Rhamnaceae in China,the indices of species were all higher than the corresponding values of genera.When the number of genera and species were both 1,the number of patches,class area,percentage of landscape,largest patch index and landscape shape index were all the largest.When the number of genera and species increased gradually,all indices showed a decreasing trend.