关键词: 沙漠化土地, 分形, 分维, 中国

Abstract: Based on the fractal theory, the spatial fractal character of China desertification land has been quantitatively analyzed in this paper. Some conclusions are drawn as the followings. (1) The relationships between size and frequency of patch area and patch shape index objectively exist for China desertification land. (2) The relationships between perimeter and area of patches objectively exist for different types of China desertification land, which shows that the spatial fractal structure exists for China desertification land. (3) Fractal dimensions of different types of China desertification land are calculated. Fractal dimension of Latent wind-drift sandy land is the largest with value 1.5148, while smallest for Shifting dune with value 1.2422, reflecting the most complex for Latent wind-drift sandy land and the simplest for Shifting dune in spatial structure. (4) The complexity of spatial structure of different types of China desertification land is listed in this paper. (5) Stability indexes of spatial structure of different types of China desertification land are calculated and listed too. Stability index of Shifting dune is the largest with value 0.2578, while smallest for Latent wind-drift sandy land with value 0.0148, showing the spatial structure of Shifting dune is the steadiest, while the most unstable for Latent wind-drift sandy land. (6) The special attention should be paid to the ecological protection and restoration to prevent Latent wind-drift sandy land and Latent desertification land from further degradation now.

Key words: desertification land, fractal, fractal dimension, China