Study on Spatial Distribution of Pinus keasya var.langbianensis in Southern Yunnan

Based on the data of forest management inventory in the year of 2005, Landsat TM remote sensing image, and ASTER-DEM, this study was carried out. The threshold of distribution was concluded on different environmental gradients. Multiple correspondence analysis (MCA) was carried out and the influencing factors were selected. The interactional relationship between environmental factors and distribution of Pinus keasya varlangbianensis was analyzed and ordered. Results showed that, in the respecters of average DBH, height, canopy density, stand volume per unit area, slope,Pinus keasya varlangbianensis had no obvious change in different altitudinal gradients, showing a steady state or small undulation. The environmental factors impacting Pinus keasya varlangbianensis spatial distribution from high to low was altitude, slope position, gradient, and slope exposure.