| Soil resource is the most essential matter for human being's existence. It is the indispensable raw material for developing agriculture and forestry. With the development of soil science, the construction and application of soil resource information system (SRIS) has become an important research aspect of soil science. In this dissertation, a soil resource information system is established and used for soil resource data management and soil quality assessment for Zhenlai County, Jilin Province. Taking GIS software MapGIS, ArcView and database software Visual FoxPro 5.0 as technical platform, combining the advanced programming language Visual Basic 6.0 and GIS control element MapObjects, a soil resource information system (SRIS) is established based on the principle of systematicness, practicability and expansibility. The SRIS has dimensional map database and attribute database, the former is mainly the 1:100000 scale soil map and the later is mainly based on the data from the second soil survey of China. The SRIS can carry out the function of data display, edit, output, management, inquiry, etc. Also, it can manage, maintain and change the soil type map and the soil physical and chemical property map. So long as one soil quality evaluation model is built up, one can evaluate the soil quality and grade the soil by using the SRIS. It is very significant for soil resource's continuable utilization to evaluate the soil quality by combining the GIS technique with the mathematical model. In this dissertation, the soil quality evaluation is carried out in Zhenlai County. In the evaluation, the soil species is adopted as evaluation unit and the organism, total nitrogen, total phosphorus, alkaline hydrolysis nitrogen, rapid available phosphorus, PH value and soil character are selected as evaluation factor by using expert consultation method. The weight of the evaluation factor is defined by the analytic hiberarchy process and the threshold value of the soil quality evaluation factor in Zhenlai County is defined according to the soil fertility classification status in the area studied. Then the soil quality evaluation result is calculated by using the index summation model and the evaluation result is analyzed by using GIS technology. The result indicates that the soil resource in Zhenlai County is mainly the medium-to-low grade soil which is account for 61% and the primary types of the medium-to-low grade soil are the light chernozem located in the western and central part of the Zhenlai County, the chernozem located in north part, the alluvial soil located in the bank of the rivers and the solonetz-like soil and the sandy soil located in the central part. The primary types of the high grade soil are the chestnut soil located in northwest part and the meadow soil located in eastern and south part. The primary types of the low grade soil are the solonchaks and the highly alkalized solonetz-like soil. The SRIS provides the basic technical support for the soil resource protection and appropriate utilization. In addition, the SRIS provides a reference for the soil resource study and the land resource information system development. Using the SRIS, the dimensional data and the attribute data of the soil are combined with each other, the soil quality evaluation and the soil dimensional distribution are combined with each other, too. That will benefit to the soil data change survey and the database management. Also, the combinations above mentioned strengthen the ability of the dimensional analysis and real-time updating. The SRIS developed in this dissertation has extensive adaptability and good expansibility. The data processing is accomplished with the GIS interface groupware controlling the COM object of the GIS software. Thus strengthen the adaptability of the SRIS. Thanks to the use of the Visual Basic language, which is convenient for the second development of the system, for programming, the SRIS possesses the advantage of expansibility.
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