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提高材质和增加材积是满足国民经济对这个重要原料需要问题的两个方面。因而营林学的主要任务之一就是为林业生产提供技术方法,以便能在最短期间内提高所培育林木的木材质量。此外,林分结构,特别是密度的合理性,在现阶段营林部门提高森林生产力中起着很大作用。由于缺乏林业劳动力,林场在营造针叶用材林时普遍有减少造林株数和通过营林抚育以增加林木稀疏程度的趋势,因而这一问
To improve the quality and increase the volume is to meet the national economy on this important raw material needs of the two aspects. Thus, one of the main tasks of silviculture is to provide a technical approach to forestry production in order to increase the quality of the timber grown in the shortest possible time. In addition, the stand structure, especially the rationality of density, plays a significant role in improving forest productivity in the forest management sector at this stage. Due to the lack of forestry labor force, forestry farms generally have the tendency to reduce the number of afforestation and tending to increase the sparseness of trees by creating coniferous timber forests, therefore, this question