Site Classification and Evaluation of Teak Plantation in Xishuangbanna,Yunnan Province,China

[Objective]Site classifications and evaluation of teak( Tectona grandis) plantation by sample plot survey and analysis is to build a scientific basis for site selection of teak plantations of Xishuangbanna or other similar regions.[Method]51 sample plots distributed in 12-26 years old plantations were set up and growth traits of teak were measured,and site topography factors were recorded. Soil samples were collected for analyzing soil chemical and physical properties. 8 factors of soil chemical properties selected by stepwise regression method were used to divide soil nutrient grades by principal component analysis,and the relations between soil factors and the growth of teak together were analyzed by quantity theory I.[Result]The multiple correlation coefficient of quantity model fitted by the selected site factors( soil nutrient grades,soil texture,slope orientation,slope position,slope degree,soil bulk density and Elevation)was 0. 865,indicating a highly significant correlation( P < 0. 01). Soil density,s