Application Of 3S Technology To Study And Establishment Of Forest Function Map

At present, forest function regionalization in China is mainly on large-scale. The method can be easily macro-controlled. But it is short of division on meso-scale and small-scale. The text took Jiufeng Forest Park as researching objective and made Jiufeng forest functions map. We considered it as a trying and reflection of forest function division on meso-scale and small-scale. On the basis of"3S"technology, the second forest check data and the field investigated data, the text discussed and researched the role that partial local forest (such as forest farm) played in different sections. Therefore, it was needed to analyzed and evaluated some factors, such as soil type, soil thickness and some features, such as small and medium-sized landscape, vegetation type. In Jiufeng Forest Park, the landscape features, tourist attractions and lines shoud be paid more attention when we divided forest function regions.Normally, forest function map was made through manually sketched on topographic maps and remote sensing image maps after determining the forest function of each section. Basing on the GIS, aerial photos, DEM maps and stock maps, we made the map of forest function sections.Patch division in forest regionalization is on the basis of factors, such as land categories,stand types and geomorphology. But the visual observation accuracy of slope and aspect was not enough. So, in the research, we modified the slopes and aspects of the second forest check data by inquirying 1/10000 DEM map. But vegetation types and tree survey factors of the second forest check data was used. After collecting various factors of dividing forest function, we selected 13 factors (land category, altitude, slope, aspect, and so on) and used Cluster Analysis Model to analyze. And then, we made a forest function map.Jiufeng Forest Park was reconstructed from education experiment forest of Beijing Forest University. It has many functions, such as forest park, education experiment. Jiufeng has many steep slopes and its soil layer is superficial, so Jiufeng Forest Park also has such functions as conserving water and soil. According to forest functions in different sections, making use of Cluster Analysis method, we divided Jiufeng Forest Park into 5 kinds of functions areas: water resource conservation forest, water and soil conservation forest, recreation forest, scenic economic forest and experimental forest.