| In this paper, three times Landsat data (1990, 2000 and 2010) were used as basic data in order to extract the information of forest volume in Zhongsan Wugui mountain. In the process of obtaining forest volume information, 120 sample data was collected using the hand-GPS according to the Grid sample method. On the other hand, under the supporting of ENVITM and SPSSTM software's, this paper built a quantitative forecast model of forest volume based on 9 indexes using the linear regression method. At the last, this paper discussed the time series change of the forest preserve volume in this area in past 20 years. According to the model, three times level maps of forest volume in 1990/2000/2010 were drafted and the spatial changes were discussed. This paper provided a case study and was meaningful for keeping the balance of the watershed forest ecosystem and was important in maximizing the ecological, economic and social benefits. |
