A Study Of Regional Cultivated Land Resources Classified Evaluation Based On GIS ——With Minhou County As An Example

The study of regional cultivated land classified evaluation aims at revealing the class of cultivated land quality and theirs distribution in both theory and reality in regard to the government's policies of agriculture development,cultivated land exploration, field basic cinstructiori and cultivated land sustainable development.The thesis sets MinHou County as an example, based on the understanding of the County's reality and analysis of a mount of relative datum, 367 sample plots are established in MinHou County. According to local investigation, agriculture-hemical analysis and consulting relative datum,22 factors,contains soil character,natural environment and social economic condition, are selected as the factors impacting the quality of cultivated land, then step-wise multi-variable regression analysis is applied to select the major evaluation factors. According to theories and ananlysis of the reality, the results showed that the major factors are the eight factors including slope degree, organic matter and CEC etc, each factor's weight is worked out.The gradation indices of each major influential factors is determined with expert grading method. Based on Mapinfo platform, the map and propertive data of each major evaluating factors and evaluating unit is established, then the mathematics modal of cultivated land classified evaluation that is established with the dynamic set method evaluated MinHou County's cultivated land classes, and the major limited categories of the county's cultivated land are worked out.The result of study shows: the rates of Minllou County's secondand third classes cultivated land are 68.01%, the rates of it抯 first classes cultivated land are 31.99%,and it shows the qualities Of MinHou County抯 cultivated land are poor. The major limited model are sand limited, clay limited, steep Limited, cold limited and poor limited model,the rates are 25.O4%~ 12.58%~ 6. 14%~ 12. 17%~ 15.27%.As aresult, it抯 a important task for MinUou County to govern the second and third classes cultivated land, eliminate the effect of major limited factors, establish the field with high quality and promote agricultural sustainable, stable and harmonize development.The strategies to realize a sustainable development of Minhou County抯 cultivated land resources mainly included such social policies measures and technological economic measures as cultivated land protective policy, keeping dynamic balance of total arable lands, combining using and culture etc.