集贤县位于完达山北麓,从五十年代末期就开始营造落叶松人工林,现有21万余亩,保存率为52.5%,约有7万亩郁闭成林,占全县森林面积的13%。已经成为全县的重要森林后备资源。七十年代以来逐渐开始间伐利用,生产了大量的小径木,支援了国家建设,为营林生产积累了资金。为了研究落叶松人工林的生长,立木价值与投资效果,我们在不同的坡向、坡位选 Jixian County is located in the northern foot of Wandashan, from the late fifties began to build larch plantation, the existing 210,000 acres, the preservation rate of 52.5%, about 70,000 acres of canopy forests, accounting for the county forest 13% of the area. Has become an important reserve of the county forest resources. Since the 1970s, we have gradually started to use thinning timber and produced a large number of small-diameter woods, supported the construction of our country and accumulated funds for the production of silviculture. In order to study the growth of larch plantations, the value of standing plants and the investment effect, we selected them in different aspect,