落叶松、黑松是发展造林事业重要而广泛的树种。造林实践不断证明,在很多情况下,落叶松、黑松纯林不仅病害、虫害明显严重(落叶松早期落叶病、枯梢病、落叶松毛虫;黑松枯枝病、落叶病、小蠹虫等),而且单株立木材积、单位面积蓄积量以及林木完满度也远不及落叶松、黑松混交林。为确切地说明纯林与混交林的生长量及其林木完满度的高低及林木材质的优劣,我们深入了伊丹、马鞍、新家等三个国家林场,对立地 Larix, black pine is the development of afforestation important and extensive species. Afforestation practice continues to prove that in many cases, larch and black pine forests are not only diseases, pests were significantly serious (early deciduous larch disease, Shoot Blight disease, pine caterpillar, black pine withered branch, deciduous disease, bark beetles and other ), But also stand per unit of wood volume, volume per unit area and forest fullness are far less than larch, black pine mixed forest. In order to clarify the growth of pure and mixed forest and its forest fullness and the merits of the forest material, we went deep into the three national forest farms such as itan, saddle and new home,