Evaluation Of Cultivated Land Fertility Of Hainan State Farms

The research select Hongming region of Hainan state farms as the study area, develop the cultivated land fertility evaluation which is great important to improve and utilize the cultivated land in northeast Hainan, farm adjustment of industrial structure, scientific fertilization, improving the benefits of land comprehensive utilization and achieve the sustainable use of cultivated land resources ultimately, as well as provide scientific basis for the guidance of the local soil testing and fertilizer.First of all, in views of Hongming region of Hainan state farms, this thesis collect and analyse the extensive data and information of areas, taking advantage of GIS software as a spatial analysis, applying software processed attribute data in Excel and Access etc. Then, evaluated and analyzed the cultivated land fertility of Hongming region of Hainan state farms based on AHP and principal component analysis, respectively. Finally, from comparative analysis of cultivated land fertility evaluation result by distribution region changes and area changes we can find the optimum evaluation method of cultivated land fertility in Hongming region of Hainan state at the present time. The main conclusions are as follows:1,The basic database of cultivated land resources of Hongming region of Hainan state is established. Based on this database, utilization of GIS data processing and analysis, extraction of evaluation factor of thematic map, fully combined spatial analysis function of GIS with the cultivated land fertility evaluation, implementation of Graphical cultivated land fertility evaluation result.2,Based on AHP, the cultivated land of Hongming region is divided into four classes. The cultivated land ofⅠclass covers 3229.9 hectares, taking up 9.86% of the total area; theⅡclass covers 12255.01 hectares, taking up 37.41%; theⅢclass covers 12836.08 hectares, taking up 39.18%; theⅣclass covers 4439.80 hectares, taking up 13.55%. The different classes of lands order presentsⅢ>Ⅱ>Ⅳ>Ⅰ.3,Based on principal component analysis, the cultivated land of Hongming region is divided into four classes. The results showed that the cultivated land ofⅠclass covers 3346.45 hectares, taking up 10.21% of the total area; theⅡclass covers 18669.76 hectares, taking up 56.99%; theⅢclass covers 9001.62 hectares, taking up 27.48%; theⅣclass covers 1742.97 hectares, taking up 5.32%.The different classes of lands order presentsⅡ>Ⅲ>Ⅰ>Ⅳ.4,Calibrate the cultivated land fertility evaluation results represented by Rubber production:Calibrate the cultivated land fertility evaluation results represented by Rubber production:①though stacking up the rubber yield map on the result map of two methods respectively,it can be seen that the evaluation results of AHP and the yield map in the regional distribution of the fitting degree was significantly higher than the principal component analysis; Then,The Evaluation Result of AHP and principal component analysis were carried out with the rubber production level of accuracy test, The coincidence rate of AHP was 58.72%, but the coincidence rate of principal component analysis was 39.91%.②Through statisticing the differences between the Rubber production level and the Grade area of two methods,it can be drawn that the average mean in Grade area of AHP and Grade area of principal component analysis in Rubber Yield Grade distribution area was 22.08% and 43.82%;In Grade area,AHP evaluation results and the actual output level of an area of soil fertility by 50.52% the same, but the principal component analysis is only 34.56% the same with them.Therefore, AHP is better suited for cultivated land fertility more than the principal component analysis in Hongming region of Hainan state.