The aims of this study were to analyze the correlation between rocky desertification at different slopes and water and soil loss quantitatively

and provide the scientific theoretical basis for the ecological environment management and restoration in the county area. Takeing Panxian County of Guizhou Province as the research area

with the support of RS and GIS technology

based on ALOS remote sensing images

lithology and 1∶50 000 topographic maps

using Remote sensing interpretation method

Surface analysis and Map Algebra principle

the index factors of rocky desertification and water and soil loss were extracted. Through ArcGIS spatial analysis and correlation analysis model

analysis of the correlation between rocky desertification at different slopes and water and soil loss in Panxian County. The results showed that: Panxian County had a rocky desertification area of 1 008.45 km2

accounting for 24.9% of the total area

the degree of rocky desertification was mainly mild

moderate and strong

accounting for 45.47%

29.67% and 20.29% of the total area of rocky desertification

respectively. Water and soil loss area of 521.05 km2

accounting for 12.85% of the total area

the degree of water and soil loss was maily mild and moderate

and 67.75% and 17.36% of the area of water and soil loss

respectively. Rocky desertification and water and soil loss occurred in the place where the slopes were 5 and 35 degrees

accounting for 85.08% and 82.45% of the area of rocky desertification and water and soil loss

respectively. When the slopes were less than 8 degrees

there was a negative correlation between rocky desertification and grade of water and soil loss

and between water and soil loss and grade of rocky desertification. When the slopes were between 8 and 35 degrees

the area of rocky desertification and water and soil loss decreased first

then increased

and later decreased again. When the slopes were greater than 35 degrees

rocky desertification and water and soil loss grade were negatively correlated under strong erosion

but the correlation became positive when the erosion went beyond strong erosion. Water and soil loss and rocky desertification grade were positively correlated under mild rocky desertification

but they were negatively correlated when the rocky desertification went beyond mild rocky desertification.