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辽西地区地形起伏,植被稀少,水土流失严重,土壤瘠薄,气候异常干旱。这里造林面积较大的只是油松,油松纯林病虫害严重,火险性强,改土保水作用差,生态上不够稳定,目前造林的迫切问题是大力发展油松混交林。本文对辽西地区现有几种混交林类型进行了评价,并提出在营造油松混交林时,由于辽西燥热强光等恶劣自然条件的限制,使得阔叶树种初期不能生长,因此应在栽植阔叶树前或同时栽植油松和灌木,待生态条件有一定改善之后栽植阔叶树才可成林。混交方式根据立地条件与树种的不同可选择行混、带混、块混以及不规则的混交方式。
In the western Liaoning area, the terrain is undulating, the vegetation is sparse, soil erosion is serious, the soil is infertile and the climate is abnormally arid. Here only a large area of afforestation of Pinus tabulaeformis, Pinus tabulaeformis plant diseases and insect pests serious, strong fire danger, poor soil water conservation, ecological stability is not enough, the current afforestation urgent problem is to vigorously develop mixed pine forest. In this paper, we evaluated the types of mixed forest in western Liaoning and proposed that when the mixed forest of Pinus tabulaeformis was built, the broad-leaved tree species should not grow in the early stage because of the limitation of the harsh natural conditions such as the heat and light in western Liaoning. Or at the same time planting Pinus tabulaeformis and shrubs, to be some improvement in ecological conditions after planting broadleaf trees can be forest. Mixed way According to the different site conditions and tree species can choose to mix, with mixed, mixed block and irregular mixed mode.