Study On Forest Site Evaluation And Management System In Wang Jiagou Watershed Base On GIS

Little basin forest site analysis and evaluate in Loess plateau is one of the basic work on forest production,It is the foundation of realizes scientifically afforests, forest management and small basin comprehensive administration. To realize scientifically analysis and evaluate of little basin forest site in loess plateau two points of must be hold, the main restricted factor of forest growing and on the basis of restricted factor of the leading factor to carry on the rationally analysis and high-efficient Management .The paper carries on the following work in the guidance of the two points above. 1 The analysis of soil water content-main restricted factor of forest growing on Loessplateau Past result of study indicate that the differences of site type in loess plateau areconcentrate reflect on the condition of the soil water, and the water condition is exactly therestriction factor influencing the trees growing. But to a small basin of more than ten sq km,main factor of cause its soil water content differences are factors, such as topography, groundform, soil, etc.Base on this view, to divide forest site type of the basin are mainly on thesoil water , and also use quantification theory type â… to solve quantization relations betweenquantity of soil water and factors such as topography , ground form , soil ,etc. 2 Analysis and treatment of the little basin space data Analysis and evaluate of forestry site on little basin will involve a large amount ofspace data processing and analyses. And GIS with strong power of geographical data spaceanalyses function and mapping the function, it can offer the flexible application model,become an irreplaceable tool on the forest site analyses and appraise. This paper use strongpower of GIS space analyses technology to make soil water content and actual topography inthe basin space information get related, such as ground form and soil, etc. It combines thefigure together with the attribute database organically. Solve various kinds of the problems inthe data processing of place and analyses of little basin forest site conveniently andeffectively. 3 Small basin forest site information management system The basin forest site management system is integrate on the basis of above-mentionedresearch work, adopt on the basis of thought on package design program, and object-orientedvisual programming language. Using Delphi6 and MapX4.0 component product of ActiveXfrom MapInfo Corporation. The system contains file management, layer operation, dataoperation, chart of data analyses, Theme Mapping application, system maintain and help.Each sub-system run separately, making it has strengthened systematic independence,making it easy to management and maintenance, also they combine as whole organic at thesame time. Through this system can carry on various kinds of the operation of forest siteinformation which include the input, store, inquire, view, statistical analysis output ofattribute data, the inquiry analyses of map, create thematic map of site type and the appraiseof site type. The system has friendship of interfaces, strong practicability, simply operate,conveniently etc.