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在东北林区过伐林的面积是相当大的。形成原因有两种:一种是日伪在原始林中进行掠夺式采伐而留下的残破林相;另一种是建国后在原始林或前一种过伐林内进行不同强度的择伐,只注意生产木材,忽略了抚育经营而造成的。这部分过伐林应通过抚育采伐进行改造,这样既可得到木材又能提高单位面积生长量,使森林越采越好,青山常在,永续利用。一、林地概况试验林地是带岭林业实验局永翠经营林场39林班的4小班,位于小兴安岭林区永翠河右岸。该小班面积22公顷,是
The forest area in the northeast forest area is quite large. There are two reasons for the formation: one is the shattered forest phase left by predatory logging in the original forest; the other is the selective cutting with different intensities in the virgin forest or the former over-cut forest only after the founding of the PRC Pay attention to the production of timber, ignoring the tending business. This part of the over-deforestation should be reconstructed through deforestation, so that both the timber can be obtained and the unit area of ?? growth, so that the more the better the forest, green mountains often, sustainable use. First, the overview of forest land Experimental forest is with Ling Forestry Experimental Bureau Yong Tsui forest farm management 39 classes 4 classes, located in the small Xinganling Yong Cui River right bank. The small class area of 22 hectares is