Basing On GIS Analysis Of Shuiyang Forest Department's Forest Resource And Ecological Value Change

This study combines the Shuiyang Forest Department's natural survey and business history, which is on the GIS technology platform. Shuiyang Forest Department's two periods of forest maps of 1958 and 1999 are main basic data, set up a forest resource space data base of research area of 1958 and 1999, achieve data return of two periods of forest resource. We mainly make a study of following aspects:(1) We statistically educe the forest resource variation course on quantity and space distributing during forty-one years. During forty-one years, the area of forest land and shrub land increase, forest- covered ratio and used-land ratio rise, artificial forest area increases much more and forest structure also improves. But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low. At the same time non-forest land area turns wide and distributing range enlarges.(2) From the landscaping and ecology angle, characters of two periods of landscape pattern are quantificationally analyzed in 1958 and 1999; all kinds of styles of landscape change ratio are confirmed. The analysis result indicates that the quality of landscape style becomes large, the total number of patch reduces and average patch area expands. Old growth forest ratio in landscape decreases, softwood forest ratio and rare broad-leaved forest ratio turn high and constructive land patch enlarge apparently. While there is no obvious fragmentation in the whole landscape, the shape of patch trends to be complex.(3) The ecological benefit as a result of forest resource change in the forest department is quantificationally analyzed and evaluated in value by ecological benefit measure theory. The whole ecological benefit shows downtrend, especially the area of nutrient waterhead and water and soil benefit in forest get large, and on the contrary the forest area lessens.(4) The reasons that reasonless change of forest structure comes into being are analyzed. Because of excessive centralized-disforest, a series of internal structure of forest are destroyed seriously, though forest area come back to rise since resource management and artificial forest are strengthened. But scientific methods and effectivemeasures of stand volume forest structure and age class are urgent affairs.(5) Concrete adjustment and measurement that are suitable to the reality is advanced, and the development of Shuiyang Forest Department in future is forecasted. We can foresee that all targets will come back the standard of 1896 by 2040 to 2060, that ecological benefit will also come back to the standard of 1958 by 2030 that at the same moment economic benefit will rise and workers' earning will increase, and life will improve step by step.By application of advanced GIS, the study combines the landscaping and ecology and ecological benefit measure theory and analyzes synthetically the forty-one years forest resource and environmental change of Shuiyang Forest Department, and all things are considered in the study. It is quite significant on the study of forest resource and environmental change theory and practice in concrete business management in Shuiyang Forest Department.