中国植物空间分异规律

以省级行政区为分析单元,借助ArcGIS空间分析功能对中国行政分区图、中国森林覆盖率图、中国植物区系图、中国植被分区图进行叠加分析。通过对同一植被分区下分析单元数据进行整合,给出全国不同植物区系、植被分区、森林覆盖率信息。采用二阶聚类综合判别法,提取中国植被分区总体信息,探求植被空间分异规律,发现一类、二类、三类植被的比例为30∶37∶23,反映出植被的区域分布特性较强;四类植被比例大致占10%,反映出大区域内部的局地小生境造成的植被分布的整体差异。另外,一类植被多分布在中高纬度地带,二类植被贯穿中国全纬度,三类植被多分布在低纬度地带。

Spatial disparities of Chinese vegetation

In this paper, the Chinese administrative division is regarded as the analysis unit, the vector data of Chinese administra 2 tive district map, Chinese forest coverage map, Chinese flora map, and Chinese vegetation zoning map are overlaid using the spa 2 tial analysis function of ArcGIS. T he information of vegetation zoning and flora, as well as forest coverage is obtained through the analysis of unit data. On the basis of Chinese vegetation zoning information using the second 2order cluster analysis method, the spatial disparities characteristics of vegetation are analyzed. The proportion of the first class, second class, and third class vegetation is 30B37B23, which reflects a strong spatial variation of vegetation distribution. The proportion of fourth class vege 2 tation is about 10%, which reflects the regional variation from the overall vegetation distribution. The first class vegetation mostly exists in the region of high latitudes, the second class is everywhere, and the third class is located in the region of low lat2 itudes.