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本指数表的编制是在林分优势木平均高与林分平均年龄的关系基础上编制的,其优点是直接反映杨树速生丰产林不同立地条件,在相同的标准年龄时林分优势高的差别。不同杨树品种,相同立地条件其地位指数的差别,反映出适地适树。用树高的绝对值表示生产力的等级。图表直观,灵活性强,使用方便,不受疏密度的限制和下层抚育间伐的影响。对培育速生丰产林基地,增加木材产量,提高森林生产力,扩大森林资源,发挥森林多种效益,具有重大现实意义。
The preparation of this index table is based on the relationship between the average high stands and the average age of the stands, and has the advantages of directly reflecting the different site conditions of the fast-growing and high-yield stands of poplar, and has the advantages of high stands in the same standard age difference. Different varieties of poplars, the same site conditions of its position index differences, reflecting the appropriate tree. The level of productivity is expressed as the absolute value of tree height. Intuitive chart, flexibility, ease of use, not subject to the restrictions of density and lower tending thinning effect. It is of great practical significance to cultivate fast-growing and high-yield forest base, increase timber output, increase forest productivity, expand forest resources and bring various benefits into the forest.