论文部分内容阅读
刺槐生长迅速,木材坚韧,纹理细致,根系发达,耐干旱瘠薄,具根瘤菌,是西北半荒漠地区的主要造林用材树种。贺兰县金山林场对1977年营造的刺槐林于1980年4月进行抚育间伐试验,1984年测定,已初见成效。选择立地条件和林分特征基本一致的林地,设间伐和对照两种处理,标准地面积0.1公顷,间伐强度以控制间伐后每亩的保留株数为准,按原定植株数的50％计算。抚育间伐的好处是: 1.能增加林木的生长量间伐后由于增加保留
Robinia pseudoacacia grows rapidly, the wood is tough, the texture is meticulous, the root system is developed, the drought-resistant infertility is infertile, and the rhizobium is the main afforestation timber species in the northwest semi-desert area. Jinshan Forest Farm in Helan County in 1977 to create the locust forest in April 1980 tending thinning test, measured in 1984, has achieved initial success. Select the site conditions and stand characteristics of forest land are basically the same, between the set and the control of two kinds of treatment, the standard area of 0.1 hectare, thinning intensity in control of the reserve after the number of acres per mu, subject to 50% of the original number of plants calculated. The benefits of tending thinning are: 1. Can increase the growth of the tree after thinning due to increased retention