Karst Rocky Desertification Landscape Pattern in Karst Regions of Guizhou From 1990 to 2010:a Case Study Area of Liuzhi in Guizhou Province

This paper analyzed the landscape pattern change of karst rocky desertification from 1990to 2010in Liuzhi of Guizhou Province from the aspect of karst rocky desertification evolution trend,spatial combination characteristics and the landscape pattern. The results showed that:the area of karst rocky desertification landscape type of Liuzhi changed greatly in resent twenty years:the area of non-karst rocky desertification increased by 73.16km2 and the strength decreased;the percentage of non and light Karst rocky desertification increased,the patch density of non,potential and light rocky desertification landscape type ascended.Meanwhile,the landscape shape index of light rocky desertification increased by 4.57and the shape of patches became more complicated and irregular.The rocky desertification landscape diversity index was higher and the average value of 1990,2000and 2010was greater than 0.66.The rocky desertification landscape type was various.However,the landscape fragmentation was higher with an ascending trend.From the aspect of landscape analysis,the rocky desertification landscape of the study area had recovered to some extent in the past twenty years;the patches of low grade rocky desertification ascended and the dominance of original high grade had been decreased.However,the newly recovered low grade rocky desertification was not contiguous;we should take some measures to make ecology recover patches be contiguous to form a stable ecosystem in the future management process.