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落叶松和胡桃楸是东北林区的主要用材树种。所以,在营林生产过程中,要认真研究发展这两个树种的方法和有效措施。根据各地区的造林实践,在大多数情况下,营造落叶松或胡桃楸纯林,不但病虫害比落叶松、胡桃楸混交林(下简称松、楸混交林)严重,而且树高、胸径、单株立木材积、单位面积蓄积量和林木完满度也远不如松、楸混交林。由不同营林技术措施引起的相同树种生长量上的差异性,最终表现为松、楸混交林的经济效果好于其相应的纯林。为了说明混交林与纯林之间的生长量高低、林木形质优劣、经济效果好坏,本文根据吉林省伊通县伊丹国营林场提供的资料,对松、楸混交林进行技术经济分析。
Larch and Juglans mandshurica are the main timber species in the northeastern region. Therefore, in the production of silviculture, we must carefully study the methods and effective measures for the development of these two tree species. According to the practice of afforestation in various regions, in most cases, the pure forest of Larch or Juglans mansion, pest and disease than Larch, Juglans mandshurica mixed forest (hereinafter referred to as pine, Lumber mixed forest) serious, and the tree height, diameter at breast height Strain wood volume, unit area volume and forest fullness is far better than pine, Luoki mixed forest. The differences in the growth of the same tree species caused by different silvicultural techniques finally show the economic effects of the mixed forest of Pinus tabulaeformis and P. mandshurica are better than those of the corresponding pure forests. In order to illustrate the level of growth between mixed forest and pure forest, the merits of forest quality and the economic effect are good or bad. According to the data provided by Itin State Forestry Farm in Yitong County, Jilin Province, the technical and economic analysis of mixed forest of Pinus and Sorghum is carried out.