The Application And Analysis Of "Limited Factor" Evaluation Method To Cultivated Land Reserved Resource

The current our country is the world's most populous country,the food crisis is the biggest challenge we face.With the development of economy and the national urbanization,industrialization process in the whole advancement,the land for construction and industrial and mining area will increase sharply,at the same time cultivated land is inevitable.The resulting loss of cultivated land quantity and quality of food output decreasing,is a difficult problem confronting us.Is to relieve contradiction of population and land reserve cultivated land resources and the important guarantee for the problem of food security.Profile in this background,this paper studies the academic progress of land evaluation at home and abroad,and read a lot of related information about reserve cultivated land resources evaluation,as a starting point,put forward the research purpose and meaning.Next step is clear the main content of the research on the basis of building scientific evaluation system and research methods,through the perfect process detailed combing out the technical route.At the same time,in the process of overview summarizes the technical route of this paper briefly introduces the reserve cultivated land resources,land evaluation,restrictive factor method and relevant concepts,and regard it as the theoretical basis of reserve cultivated land resources evaluation.In this paper,guided by the theory of sustainable development,based on 2014 national implementation of reserve cultivated land resources on the basis of investigation and evaluation.Based on figure spot reserve cultivated land resources should be cultivated by multi-factor conditions combination and become,has the leading role"limiting factor" method is used to map to evaluation.Finally application of GIS to build evaluation system to complete the evaluation results,using the evaluation results analysis during the planning period in the study area of cultivated land quantity can meet the requirements of dynamic balance,and safeguard measures.This paper carried out the research work and achievements are as follows:(1)using the "limiting factor" method,selected the 11 can reflect figure spot whether appropriate indicators of reserve cultivated land resources,establish reflect the cultivated land ecological condition,social economy condition and farming convenience degree evaluation system.Through the analysis of screening all appropriate tillage conditions of reserve cultivated land resources within the territory of map spot,and statistical area.(2)through the appropriate figure spot on the acreage,budget out fit all appropriate tillage of reserve cultivated land resources in the study area.And planning during the period of construction land index of cultivated land were analyzed,effective to calculate the study area can meet the demand of dynamic balance.And budget in accordance with such developing trend of reserve cultivated land resources for the development of fixed number of year.The instance backup resources investigation,the stability of reserve cultivated land resources for the next step will lay the foundation,development and utilization of related farmland protection policies for science and maintain food security to provide decision support.