The Effectiveness Evaluating Information System Of Small Watershed Comprehensive Management Based On GIS In Black Soil Region

The purpose of evaluating soil and water conservation is to identify the influential factors, range and degree of the comprehensive management. Adopting the systematic analysis and evaluation as the theory and method, from the point of change to ecosystem, economical system and social system of small watershed from comprehensive management measures, this research proposed an index system of small watershed comprehensive management effectiveness evaluation keeping to the effectiveness evaluating principles. In addition, this index system was proposed based on some effectiveness evaluating theories and methods of soil and water conservation, which was suitable for the actual situation of the black soil region. This index system, including 11 indexes, is established to achieve the goal of conservating soil and water and to follow the rules of realizing economic, ecology and social effectiveness. AHP method to conduct weights of rules and combination was adopted, through consistency check, small watershed management total effectiveness was evaluated using linear weighting models.On the basis of the above illustrations, this research takes advantage of space database and property database as the systematic database to program a effectiveness evaluating information system of the small watershed in black earth areas, against the needs of soil and water conservation effectiveness evaluation. This system adopts MapObjects as its developing stage and uses Visaual Basic as its developing language,. This system includes modules for data management, report form output, effectiveness caculation and help. Besides, this system can realize many basic functions of view and some extra functions such as adding or deleting layer, strorage and management of space data, as well as inquiry, modifing and output of property data. By calling and using small watershed's effectiveness evaluating model and Excel, this system conducted a statistical analysis on systematic database, thus effectiveness evaluating results was acquired, including thematic maps,forms and documents. Taking Zhenxiang small watershed as an example, which was located in Baiquan country in Heilongjiang province, preliminary evaluation in its effectiveness after comprehensive management was conducted. Small watersheds data was integrated and classified by GIS, and was bright into evaluation system. After inputing 11 indexes value, the system can evaluate comprehensive management effectiveness in small watershed automatically, and then the results were obtained. This information system realized the application of effectiveness evaluating and informational management of the soil and water conservation to the small watershed in black soil region, moreover, informational level of evaluating soil and water conservation was improved.