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优树是林木良种壮苗的物质基础。新疆1973年以来开展的云杉、落叶松选优工作,取得一定成效,但选得的优树数量有限,不能满足各林场建立种子园的需要。为此,我们想通过建立数学模式的方法来扩大选择优树的效果。 本文用新疆林业系统联合选优小组汇总的材料,以数量化方法(Ⅰ)建立数学模式。这样,只要将几个项目的外业调查数据代入模式,做简单的加减运算,便可知道被调查的树是哪—级优树,不需再去评分而
You-tree is a good seedling wood seed material basis. Xinjiang has carried out spruce and larch since 1973, and some achievements have been made. However, the number of superior trees selected is limited, which can not meet the need of establishing seed orchards in various forest farms. For this reason, we want to expand the effectiveness of choosing superior trees by building mathematical models. In this paper, Xinjiang forestry system combined with the best selected materials group, with quantitative methods (Ⅰ) to establish mathematical models. In this way, as long as the field survey data of several projects are substituted into the model and simple addition and subtraction operations are performed, it is possible to know which tree the surveyed tree is -