Grading The Farmland Of Wusu City And The Research Of Soil Resource Exploitation

Fix the grade of farmland project, which is sponsored by Professor Zhang and the research in the strategy of exploitation and utilization upon the farmland recourses are the stem of this thesis. Fixed the grade of farmland has guiding function on its optimization use.According to the regulation on grading farmland that is issued by Ministry of Territory Resources of the People's Republic of China. The main purposes of the thesis is to grade all the cultivated land of the research area and to build up the elementary Land information System (LIS) under the MAPGIS, (chart diagram and relevant date analysis included). Based on the full and accurate information on the spot, in accordance with its natural conditions and economic state, in which the steady quality of cropland is constituted, general quality of the cultivated land of the research area has been analyzed and assessed by using the computer to process the data. Adopt the mean of analyzing the factors which influence the output of the crops to quantity and determine the factors, assess the correlation among the grading factors in the units and calculate the point value of these factors; determine the weigh value of the factors. Ten factors, which are content of organic matter, thickness of soil layer, quality of soil, pickled degree of land, condition of irrigation and state of shelter belt , the degree of land 's leveling ,central focus region (focus region location),utilization method of soil ,are chosen as grading index at last. By using a math's model, in accordance with the requirements of the regulation to evaluate the quality of the cultivated land, the results of the grades distribution of the farmland has been achieved and the characteristic of the land have been graded step by step.There are more than 30 chart diagrams in this paper, including single farmland grade map and the maps of farmland rank. With the help of computer technology, such as SPSS, VBA and DB, the farmland graded database has been established.Based on the result of graded farmland, the research, which is in the strategy of exploitation and utilization upon the farmland recourses, has been done. The strategy for development and utilization of farmland has been raised in accordance with the natural and social-economic conditions, ecological circumstances and main problems in current use of all different graded farmland.Both the farmland graded and strategy of exploitation and utilization upon the farmland recourses are in order to improve the soil conditions, optimize the soil resources, raise the land of use efficiency, increase effective cultivated area, reach the dynamic equilibrium of all the farmlands and provide a soil safeguard for the development of our social economy.