论文部分内容阅读
关帝林局孝文山林场境内,华北落叶松天然林分布较多,而且生长良好。林场为了迅速发展商品经济,满足国民经济和民用建筑对木材的需要,提出在长树山一带改造低产白桦天然林,建立华北落叶松丰产林基地。我们于1987年5月—6月对白桦迹地的立地条件进行了调查,在有代表性的地段挖了土壤剖面,进行了土壤养分分析,以期为白桦迹地能否发展华北落叶松丰产林提供依据。一、自然概况调查地位于孝文山林场长树山南侧的野沙沟和木虎沟。海拔1900—2200米,总面积约1000亩。岩石有变粒岩、大理岩、二长斑岩、英岗岩和辉绿岩等,在山坡中上部或缓
Guandi Forestry Bureau Xiaowen mountain forest site, Larix principis-rupprechtii natural forest distribution more, and grow well. In order to rapidly develop the commodity economy and meet the needs of the national economy and civil construction for wood, the forestry farm proposed to transform the low-yield birch natural forest in the area of Changshu Mountain to establish a base of Larix leptinimi high yield forest. In May-June 1987, we surveyed the site conditions of the birch horizons, dug the soil profile in the representative area and conducted soil nutrient analysis in order to provide a basis for the development of birch forests in Betula platyphylla . First, the natural profile The investigation site is located in Xiaowen Mountain Forest Hill on the south side of the Longsha Misuga and wood tiger groove. 1900-2200 meters above sea level, with a total area of about 1,000 acres. Rock granulite, marble, two long porphyry, granite and diabase, etc., in the upper or middle slope