| According to the field investigation, indoor physical, chemical and mathematicalanalysis which base on the Chinese soil classification system, soil physical and chemicalproperties, soil-forming process has been researched and diagnostic horizons of Chinese soilclassification system has been determined, and it also indentified the taxonomic classificationin the resettlement area of BanDeng bottomland DingBian country, Shaanxi province. Withthe support of ArcGIS, combined with analytic hierarchy process, fuzzy mathematics method,Delphi method and the membership function method to screen evaluation factors which usedto determine the weight and factor score, construct the membership function. Combined withGIS technology and accumulation model, the research calculation the integrated fertility index(IFI), and promotion it in the classification of the arable productivity using. The results arecompared and studied as follow:(1)According to Chinese Soil Taxonomy (Revised proposal) and Keys to Chinese SoilTaxonomy(3rd edition): It is divided into1diagnostic surface horizons: Ochric epipedon;6diagnostic characteristics: Lithologic characters, Soil temperature regimes, Soil moistureregimes, Calcaric property, Sodic property and Salic evidence.(2) In the categorization,the diagnostic horizons and their characteristics analysisindicated that the soil in this area belongs to1soil order,1suborder,2groups and4subgroups in which â…¡1belongs to Parasalic Aqui-Sandic Primosols; â…¡5belongs to SodicAqui-Sandic Primosols; â…¢4belongs to Calcaric Aqui-Sandic Primosols and â…¥4belongs toCalcaric Usti-Sandic Primosols. With the help of ArcGIS software statistical calculation ofdifferent soil types in the area, drawing project area soil type distribution map. The CalcaricUsti-Sandic Primosols soil area is15.55km~2, total surface area for investigation in45.62%,Parasalic Aqui-Sandic Primosols soil area is4.83km~2, total surface area for investigation in16.27%, Sodic Aqui-Sandic Primosols soil area of6.67km~2, occupy the22.47%of total surveyarea, Calcaric Aqui-Sandic Primosols in the area of4.65km~2, occupy the15.64%of totalsurvey area.(3) Through the use of AHP-fuzzy comprehensive evaluation on soil fertility of project area, the integrated soil fertility index IFI, the maximum value is0.5981, the minimum valueis0.2894; then the bench beach project area of integrated soil fertility index values in(0.2894,0.5981), using distance method to determine the grade: Gradeâ… ,(0.5210-0.5981) tohigh-quality fertility level; Gradeâ…¡ (0.4438-0.5210), belongs to the good fertility grade;grade â…¢ (0.3666-0.4438), belongs to the middle fertility level; Grade â…£ (0.2894-0.3666),belonging to the low fertility level.(4) Using ArcGIS statistical software to calculate the various grades of the soil fertility ofland area, finally draw project area grades of the soil fertility map. Among them, of which â… level fertility of the land area of0.29Km~2, accounting for1.16%of the total area of the projectregion; level â…¡ fertility of the land area of10.66Km~2, accounting for42.64%of the total areaof the project region; grade â…¢ of soil fertility of the land area of11.79Km2, accountingfor47.16%of the total area of the project region; soil fertility land â…£ area of2.45Km~2,accounting for9.8%of the total area of the project region.Finally, the project area soil in exploitation and puts forward some reasonablesuggestions and improvement, and provide basic data for future scientific research andevaluation index system selection. |
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