THE APPLICATION OF METHOD AND STANDARD IN SELECTING NATURAL ELITE STAND OF PINUS YUNNANENSIS IN CENTRAL YUNNAN——Selection of Elite Stand

The method to select natural elite stand of Pinus yunnanensis is to divide the phenotype values of the tree factors of Pinus yunnanensis into the environ-ment effect value and the genetic genotypic value,and then select the elite genetic factor according to the phenotype value.The processing of the application is first to investigate the annual average increment of tree height of the stand and timber grain angle and the environment factors,and then calculate the grow-ing height(ŷg) which the stand of Pinus yunnanensis should get to and the angle.(ŷg.a) which the timber grain should have got in the regional condi-tion by using the electronic computer forecast formula supplied by this essay The Method In Stand of selecting Natural Elite Stand of Pinus yunnanensis In Central Yunnan.The results of Yg and Yg.a will be put into the formula I_i=??? P_ji Y_ji/ŷ_ji(S._is.v/P_gt.v) to calculate the synthetical index selection.By then,it will be very clear that if the value of I_i is bigger than the standard value of 0.411,the stand is selected as the elite stand,otherwise it is not.In this essay,selecting the natural elite stand of Pinus yunnanensis is further expound-ed in the practical activities according to analysing the data collected from eleven sample fields.