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辽宁东部山区,约有落叶松人工成林200万亩,其中林龄40年左右的约占20％。这些林分,主要是长白落叶松和日本落叶松,经过多次间伐和早期落叶病危害,郁闭度0.5以下的不断增加,林地生产力逐渐下降。按林业部颁发的森林采伐更新规程,此类林分均属于采伐对象。但是,为了发挥其防护作用及其他效能,分布在陡坡和铁路、公路干线附近的落叶松林,不宜皆伐更新。所以,急待解决落叶松人工林的适宜更新方法。为此,我们在天然林中云、冷杉能够天然更新的启示下,又据我们1956年落叶松林
Liaoning eastern mountainous area, about larch artificial forest 2000000 mus, of which about 40 years of age, about 20%. These stands, mainly Larix olgensis and Japanese larch, after repeated thinning and early deciduous damage, under the canopy density of 0.5 and below, the productivity of woodland decreased gradually. According to the rules of forest cutting and reforestation issued by the Ministry of Forestry, these stands belong to the logging target. However, in order to exert their protective effect and other efficiencies, the larch forests distributed on steep slopes, railways and highway roads should not be updated with clear cutting. Therefore, it is urgent to solve the suitable updating method of larch plantation. To this end, we are natural forests in the cloud, fir revelation, but also according to our 1956 Larix