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选择优良林分,经疏伐、抚育、改建成为母树林,生产遗传品质经过一定程度改良的种子,仍然是我国,特别是我国北方地区,今后较长一段时期内,为生产提供良种的主要途径之一。为了从母树林中取得遗传品质和播种品质优良的种子,首先要选出优良林分。关于我国主要造林树种选择优良林分的标准,以往一直未进行过系统,深入的研究。1981年,林业部颂发了《林木选择育种技术要
The selection of good stand, the thinning, tending, conversion into a mother forest, the production of genetic quality has been improved to some extent the seeds, is still our country, especially in northern China, the longer period of time in the future, the main ways for the production of seeds one. In order to obtain seeds of good genetic quality and sowing quality from the parent tree, we must first select the good stands. As for the criteria for selecting the best stands for the main afforestation species in our country, we have not conducted systematic and in-depth research in the past. In 1981, the Ministry of Forestry issued a "tree selection breeding technology