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红松、樟子松是黑龙江省主要用材树种,材质优良,经济价值高。又是黑龙江省乡土树种,在小兴安岭、完达山、张广才岭等山地用材林区广泛栽培。因此,近年来造林比重逐年增加。早期营造的已相继郁闭成林,成林面积与日俱增。所以在成材期内如何合理经营,已成为当前需要解决的关键问题之一。一、问题的提出林业工作者,一向把林分过密而发生的生长停滞及出现个体立木自然枯死的现象,叫作自然稀疏。这是绿色植物生长过程中必
Korean pine, Pinus sylvestris is the main timber species in Heilongjiang Province, good material, high economic value. Heilongjiang Province is native tree species, widely cultivated in mountainous timberland areas such as Xiaoxing’an Mountain, Wandashan and Zhangguangcai Ridge. Therefore, the proportion of afforestation in recent years has been increasing year by year. Has been built in the early closed forest, forest area increasing. Therefore, how to operate in a reasonable period has become one of the key issues to be solved at present. First, the issue raised Forestry workers, has always been the phenomenon of the phenomenon of stagnant growth and individual stand dead wood, known as natural sparse. This is the process of growing green plants