Establishment of Tending Thinning Table for the National Chinese Fir Plantations

Based on the stand growth tables of the national Chinese fir plantations,the tending thinning tables for different site index of Chinese fir in various belts and areas in China were established. Make use of the data of 53 sample plots of Chinese fir tending thinning experiment and take y =a+bx as the mathematical model,the regression equation for the average tree height and average breast diameter after thinning was found out.Besides,make use of the tending thinning table established by the stand density control diagram of Chinese fir plantation, a precision comparison was conducted.