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本文用林分中的ⅠⅡⅢ级木的树高年平均生长量来评价林分的速生丰产,用木材纹理倾斜度来评价林分木材的经济价值,调查林分的环境因子,数量化以后,通过电子计算机来估算林分的树高年平均生长量和木材纹理倾斜度的表型理论值,进而估算林分的遗传理论值,以此来建立标准地内ⅠⅡⅢ级的树高年平均生长量及木材纹理倾斜度的理论值的综合预报公式。用树高年平均生长量和木材纹理倾斜度的综合选择指数的大小来评价林分的优劣。在平均水平偏高的基础上,再提高0.5个标准差,作为滇中地区云南松天然优良林分的标准,用此标准反馈,选出优良林分,改造成采种母树林,中选率为23.1％,基本上满足了生产上采种、用种的需要。
In this paper, Ⅰ Ⅱ Ⅲ level in the forest with high average annual growth of trees to evaluate fast-growing forest yield, using wood grain slope to evaluate the economic value of timber stand, survey of forest environmental factors, after quantification, through Electronic computer to estimate the tree height average annual growth of tree and the slope of the wood texture theoretical value, and then estimate the genetic theory of forest stand, in order to establish the standard Ⅰ Ⅱ Ⅲ grade tree annual average annual growth and wood The Synthetic Prediction Formula of the Theoretical Value of Texture Tilting. The merits of the stand were evaluated by the size of the comprehensive selection index of the tree height average annual growth and wood texture slope. On the basis of high average level, raise 0.5 standard deviation again, and use it as the standard of the natural Yunnan Yunnan pine natural forest. With this standard feedback, select the good forest and transform it into the mother plantation of seed-picking. The median selection rate is 23.1 %, Basically meet the production of seeds, the need for species.