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山杨(Populus davidiana Dode)有喜光、耐侧方庇阴、耐寒、对土壤要求不严、适应性强等特点。根据对我场苇塘沟经营区和爱国施业区不同立地类型山杨林的调查,发现山杨不仅可以使迹地及早还林,而且速生丰产,可与落叶松更新效果媲美。一、调查地区的自然概况调查地处于我场森林经理调查的51、69林班,向阳缓坡,暗棕包森林土,A层土壤厚度 8—12厘米,年平均气温3.2℃,年平均降水量703.6毫米。山杨林系撂荒地天然下种,平均年令30年,郁闭度0.80—0.95,未进行过抚育。二、调查结果
Populus davidiana Dode has the characteristics of hi-loving, side-sheltering, cold-tolerant, unsound soil requirements and adaptability. According to the survey of different types of Populus euphratica in Weitanggou operating area and Patriotic Shiye area, we found that Populus euphratica can not only make the area of land return to the forest as soon as possible, but also have fast-growing and high-yielding, comparable with the updated effect of larch. I. Survey of natural conditions in the survey area The investigation was carried out on the 51,69 forest classes undergoing investigation by forest managers in our field. The grayscale of the sunny slope and the dark brown forest soil were planted. The soil thickness of layer A was 8-12 cm, the annual average temperature was 3.2 ℃, and the annual average precipitation 703.6 mm. Populus dehypnana Department of natural under the species, the average annual order of 30 years, canopy density 0.80-0.95, has not been conducted. Second, the survey results