基于HJ-1 CCD 数据的西双版纳地区橡胶林分布特征
摘要
The distribution situation of the rubber tree Hevea brasiliensis in the Xishuangbanna area in 2011 was estimated using decision tree classification of HJ-1 satellite data and field sampling data. A quantitative evaluation of climatic characteristics and topography was conducted on this basis by spatial analysis in a geographic information system using digital elevation model and climatic data. The climate boundary of Hevea brasiliensis distribution as well as the range of altitude, slope and aspect tolerated by the species in the Xishuangbanna area were determined. The results show that the classification information acquired from HJ-1 satellite data is accurate enough to allow the dynamic monitoring of key vegetation issues. Eighty percent of Hevea brasiliensis forest was found at an elevation of 600-1300 m, with a maximum of 2100 m. Ninety percent of forest was on slopes from 0-24 degrees. The species appeared not to be sensitive to aspect and to favor areas with an average annual temperature of 18℃- with a maximum temperature of 25℃, and minimum temperature of 14℃. The relationship between slope, elevation and distribution frequency of Hevea brasiliensis can be modeled by a Gauss function. Quantification of the climatic and topographic extent of forest distribution has a significant role in the management and restoration of damaged forest ecosystems.