Abstract:
Heights,branches and crown diameters of Alstonia scholaris were compared in different-evironmental regions of Southwest Yunnan Province by the methods of Regression analysis,Leading-factor analysis,and Partial analysis,and GIS ARC/INFO8.3 and ARCVIEW3.3 et al software.It is shown that this species grows well in the areas at or blow an altitude of 1300min in Simao and Xishuangbanna,and in areas at or below 700maltitude,the growth branches its most quantity;in the areas whose altitudes range from 700 to 1300m,Alstonia scholaris grow well;When the altitude ranges from 1300m to 1700m,it grows very slowly and when the altitude exceeds 1700m,it hardly grows.