The Correlation Analysis of Desertification of Karst Rock and Land Use Patterns

Based on data of Karst land desertification and land use in 2004(scale: 1:50 000),the law of distribution of Karst land are revealed and occurrence ratio of rocky land desertification in Huangping county are explored quantitatively.Results indicate that there is a correlation between different grade rocky desertification and land use types.The shrub land,sparsely covered grass slopes,unused land,slope cropland and rocky dry-land have a higher occurrence ratio of karst rocky desertification.Slight rocky desertification occurs in sparse and moderate coverage grass slopes;moderate rocky desertification occurs in unused land and moderate coverage grass slopes and rocky dry land;intense rocky desertification occurs in rocky dry land and unused land.The rate of occurrence of moderate rocky desertification is 4.17% in shrub-land;the rate of slight rocky desertification is 62.09% in sparse coverage grass slopes;the rate of moderate rocky desertification is 56.95% and the rate of intense rocky desertification is 5.43% in unused land;the rate of moderate rocky desertification is 5.21% in slope cropland;and in rocky dry-land the proportion of moderate rocky desertification is 56.78%.In study area,these correlations between land use pattern and different grade rocky desertification varies with districts and are affected by such factors as category of rock.In the lithology and dolomite dominated area,the occurrence ratio of rocky desertification is greater than others.Large area of grass hills with dolomite distribution has taken place rocky desertification in various degrees.