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本文通过综合运用林学知识和测树学知识,构造了一个评价人工同龄纯林林分经营水平的公式。这里林分经营水平指标;H_(max)——某一地域范围内与被评价林分的树种年龄起源都相同的最大生产力林分平均高(米);min——被评价林分中最矮一株树的树高(米);被评价林分的平均胸径(厘米);D_(min)——被评价林分中最细一株树的胸径(厘米);N初——被评价林分的造林密度(株/公顷);N现——被评价林分的现实密度(株/公顷);L行和L株——被评价林分的平均行距和平均株距(米);距离较大者为行距,用L行表示;距离较小者为株距,用L株表示;K——主管部门根据科研成果规定的控制林木配置形状的最佳配置系数。 通过要求C→1+0可达到以下三个目的:①在不间伐林分中促进提高人工同龄纯林的林分经营水平;②在间伐林分中促进实施国家抚育间伐规程;③为程序造林和用计算机管理人工同龄纯林提供一条基本参考曲线。 在平面直角坐标系中以x轴表林分年龄,以y轴表C值。这条基本参考曲线就是y=1。在x>0,y≥1区域内。C→1+0的程度越大,表明林分的经营水平越高;反之就越低。 本文解决了任意两纯林间因立地条件、林龄、树种等多因素的影响难以实现的林分经营水平的比较问题。为把竞争机制引入森林经营,打开了一条通路。
This paper constructs a formula to evaluate the management level of artificial pure forest stand of the same age by comprehensively using the knowledge of forest science and tree measurement. H_ (max) - The average of the maximum productive stands (m) with the same age as the tree species under evaluation in a certain region; min - the shortest of the stands to be evaluated Tree height (in meters) of a tree; average breast diameter (cm) of the forest being evaluated; D min (min) - DBH of the thinnest tree in the forest N is the actual density of the forest being evaluated (plant per hectare); L and L are the average row spacing and the average spacing (in m) of the forest being evaluated; L is the height of the row spacing, and L is the distance between the rows. The distance between the two rows is the distance between the rows and the L strain. K - The optimal allocation coefficient for controlling the shape of the forest configuration according to the scientific research results. Through the requirement of C → 1 + 0, the following three purposes can be achieved: (1) promoting the improvement of the stand management level of artificial pure forest in the period of non-intermediate deforestation; (2) promoting the national tending and thinning regulations in the intermediate deforestation; (3) And provide a basic reference curve by using the computer to manage the artificial forest of the same age. In the Cartesian coordinate system, the x-axis is divided into ages and the y-axis table C is used. This basic reference curve is y = 1. In the region of x> 0, y≥1. The greater the degree of C → 1 + 0, indicating that the higher the management level of the stands, the lower the converse. This article solves the problem of comparing the stand management level between any two pure forests due to the influence of site conditions, age, species and other factors. In order to introduce a competition mechanism into forest management, a pathway has been opened up.