Model construction of regional desertification degree assessment based on landscape pattern analysis

The assessment on regional desertification degree is very important to prevent and control desertification.However,there are some problems about the assessment method of regional desertification degree.For example,the ecological meaning of spatial distribution of different types desertified land was ignored.And the influence of spatial distribution of different types of desertified land on overall regional desertification degree was neglected.In addition,while the area of every type of desertified land in the regions assessed is equal the assessment model fails to work.Therefore,the factor of ecological meaning of land spatial distribution on different types of sand and the factor affected the regional desertification degree should be added to the regional desertification assessment methods.To solve these problems,we selected the landscape pattern index and aggregation index according to landscape ecology principle,and applied them to construct regional desertification degree assessment model through RS and GIS technology.Finally the regional desertification degree in the six counties of Hunshandake Sandy Land was assessed by applying the model.The result suggested that this method can distinguish the desertification degree in different periods.Therefore,according to the assessment result,Zhenglanqi should enhance the control of desertification,and Guyuan county and Taibus should prevent regional desertification.