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本文从研究选优方法入手,确定用三株大树法选优的前提下,研究了日本落叶松人工林胸高直径选优指标(d优/d对)、树高选优指标(h优/h对),材积选优指标(U优/U对)于年龄的指数回归式: 又依选优林分为单位,计算优树指标标准差(δ_(n-1)),用标准差的概率分布划分等级,编制了日本落叶松直径、树高,材积的选优指标分级表。避免用直径、树高,材积3个因子对一株优树分级时,出现等级不协调的可能,而进一步用判别函数综合建立了20—30A、40—50A的直径,树高、材积指标判别函数方程: I_(20-30A)=-0.160236X_d-X_h-0.08712X_a (1) I_(40-50A)=0.824328X_h-X_h-0.659566X_v (2) 为了应用方便,根据判别函数方程确定了优树等级综合判别值,从而对初选优树进行等级判属,择优选用。
In this paper, starting from the study of optimal selection method, to determine the optimum selection of three tree method under the premise of the Japanese larch plantation chest diameter selection index (d excellent / d pairs), tree height selection index (h excellent / h pairs), and the index of optimal selection of volume (U / U pair) in the regression equation of age: The standard deviation of superior tree index (δ_ (n-1)) was also calculated according to the optimal stand index, Probability distribution classification level, the preparation of the Japanese larch diameter, tree height, volume of the optimal index classification table. Avoid the use of diameter, tree height, volume three factors on a tree when grading, there may be inconsistent grades, but further with the discriminant function to establish a comprehensive 20-30A, 40-50A diameter, height, volume index discrimination Function equation: I_ (20-30A) = - 0.160236X_d-X_h-0.08712X_a (1) I_ (40-50A) = 0.824328X_h-X_h-0.659566X_v (2) For the convenience of application, Level comprehensive discriminant value, so as to rank the primaries optimal tree sentence, choose the best use.