The Influence Of The Subordinate Function Parameters On The Land Force Evaluation In Shou County

Continuously improve the farmland productivity evaluation research in China,according to the ministry of agriculture issued county cultivated land resources management information system for cultivated land fertility evaluation,the membership function by the method of the original way type into the system.However,due to changes in production management,natural factors and social development,the corresponding membership function parameters should also be adjusted.So taking shou county as the research object,combined with analytic hierarchy process(AHP),the actual correction method and fitting method to adjust membership function parameters,such as selection and the organic matter,effective phosphorus,slowly available potassium,zinc,PH effectively summarize quantitative evaluation factors such as,using the analytic hierarchy process(AHP)to evaluate its corresponding weights,the fuzzy membership function method for calculating the membership degree,the analysis and comparison of different influence on the result of the membership function parameters for evaluation of farmland productivity.It is of instructive significance to evaluate the effect of evaluation factors on the evaluation of cultivated land force in the future.The main conclusions are as follows:(1)In the evaluation of farmland productivity,using fuzzy mathematics model,and combined with analytic hierarchy process(AHP),Delphi method,the selection of evaluation factors to adjust membership function model,the rational distribution of membership degree,and indicates that selection of evaluation factors on the shou county farmland productivity evaluation of the contribution rate of increase,more accurately reflect the soil fertility difference of cultivated,thus improve the accuracy of the farmland productivity evaluation results.(2)In CLRMIS,it is concluded that cultivated land fertility evaluation by adjust membership function parameters,compared with the original evaluation results,to a certain extent,to deepen the study of GIS and the county system,using the fitting to adjust membership function parameters,make it with the actual measured data fitting degree is higher,accurately reflect the evaluation factors in the evaluation of farmland productivity,parameter adjustment after a total of 31100 mu of arable land and other area is rising,and most of the area is not changed,through the analysis of references are provided for the farmland productivity evaluation work in the future.(3)The division of evaluation unit using soil map,map,cultivated land type map of present land use situation,namely reflected the spatial difference,also showed homogenous characteristics of land type attributes,make the evaluation results more objective and comprehensive.(4)The results of the study accords with the specific actual shou county,illustrates the use of GIS and the farmland productivity evaluation of county cultivated land resources management system to make a difference,so that the farmland productivity evaluation is more scientific,reasonable and effective,the research results of shou county agricultural development planning has certain using value and realistic significance.