Research On The Cultivated Land Quality Evaluation System And It's Utilization Decision

Firstly, the concept of cultivated land quality was defined as the integrative character of cultivated land biological capacity and the benefit of plant under the condition of using as plant cash crops, and of cultivated land potential benefit under the condition of use as construction land. Cultivated land basic function was defined as subsistence function when used to plant food crops, as benefit function when used to plant cash crops, and as bearing function when used as construction land. A cultivated land quality evaluation system was designed which include three quality index cultivated land grade, cultivated land realistic class, cultivated land potential classSecondly, two index cultivated land coefficient M, cultivated land coefficient N based on the cultivated land basic function were designed. Connotation of cultivated land coefficient M was defined as the degree of cultivated land quality when used as plant cash crops was superior to cultivated land quality when used as plant food crops. Connotation of cultivated land coefficient N was defined as the degree of cultivated land quality when used as construction land was superior to cultivated land quality when used as plant food crops. Calculated method of cultivated land coefficient M and N were confirmed. By the ranking model by similarity to ideal point based on M and N, the criterion of cultivated land can't be used as plant cash crops and the criterion of cultivated land should priority used as plant cash crops and the criterion of cultivated land can't be used as construction land and the criterion of cultivated land should priority used as construction land were confirmed.Finally, the evaluation of cultivated land grade, realistic class, and potential class were all demonstrated and the result of cultivated land grade, realistic class, and potential class were all verified in a case study in Changsha county Changsha City, Hunan Province. By calculated cultivated land coefficient M and N and confirmed C_M and C_N of the ranking model by similarity to ideal point, the result 0.5032