The Construction of the Comprehensive Productivity Index of Cultivated Land and its Practical Significance

This Paper is intended to build an algorithmic methods of cultivated land dynamic supervision index on the basis of defining the concept of cultivated land productivity.The method of the grades assessed in the national agricultural land(cultivated) and combined with GIS and multi-factor synthetic evaluation are employed.The research presents the following conclusions:(1)The cultivated land productivity is a systemic concept;the level of cultivated land productivity is the concentrated reflection of its intrinsic property which is natural geographical conditions and extrinsic property which is socio-economic input.Corresponding to this,cultivated land productivity should include quantity productivity and quality productivity,cultivated land productivity index is a comprehensive criterion to measuring cultivated land aggregate output capacity;(2)Establish the technology of cultivated land productivity index on the basis of the results of the cultivated land graduation;(3)Cultivated land productivity index has some function in the dynamic process of instructing the utilization of cultivated land,the quantitative evaluation on the future potential of cultivated land utilization has relatively distinct effects on aspects like constituting cultivated land protection and offering direction for promoting cultivated land quality,and providing scientific grasp of the food security situation of cultivated land with data support etc.