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1 低产林改造的发展山西省低产林改造工作始于50年代。当时,对此项作业,经营意识不明确,谈不上有目的地进行改造。因此,当时叫主伐,主要是生产一些矿柱和很少一些民用材,生产任务是指令性的,只有生产计划,不搞作业设计。作业对象的选择,并不是根据林学原理、经营原则(目的)因林分质量低下林相残破而选定的,主要是为了取材,因此,作业对象选定之后,什么时候完成任务,什么时候作业结束,由于当时生产手段比较落后,综合利用设施的简陋和短缺,以及经营水平粗放,所以采伐剩余物和许多等外材,
A low yield forest transformation Shanxi low-yield forest transformation began in the 50’s. At that time, this operation, business sense is not clear, not to mention the purpose of transformation. Therefore, at that time, the main felling was mainly the production of ore pillars and a few civil timber. The production tasks were prescriptive, with only production plans and no job design. The choice of work object is not based on the principle of forestry. The principle of management (purpose) is selected due to the broken forest due to the poor quality of the forest, mainly for the purpose of obtaining the material. Therefore, when the work object is selected, when the task is completed, when the work is completed At that time, due to the backward production means at that time, the crudeness and shortage of comprehensive utilization facilities, and the extensive management, the residues of logging and many other external materials,