摘要
根据分形理论,对中国沙漠化土地类型进行了分形研究。基本结论为:①沙漠化土地斑块面积和形状指数的标度频度分形关系客观存在,不受统计时所使用的标度影响;②沙漠化土地类型的斑块周长面积分形关系客观存在,具有分形特征;③计算出沙漠化土地类型的分维,其中:潜在风移沙地分维最大,为1.5148,其图斑镶嵌结构最复杂;流动沙丘分维最小,为1.2422,其图斑镶嵌结构最简单;④计算出沙漠化土地类型的稳定性指数,其中:流动沙丘稳定性指数最大,为0.2578,其图斑镶嵌结构最稳定;潜在风移沙地稳定性指数最小,为0.0148,其图斑镶嵌结构最不稳定;⑤由于潜在风移沙地、潜在沙漠化土地稳定性差,所以,在防治沙漠化过程中,特别是要注重和加强对潜在风移沙地、潜在沙漠化土地的生态保护与恢复,防止人为作用的进一步破坏。
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.
出处
《中国沙漠》
CSCD
北大核心
2006年第1期35-39,共5页
Journal of Desert Research
基金
国家自然科学基金(40301002)资助
关键词
沙漠化土地
分形
分维
中国
desertification land
fractal
fractal dimension
China
