浅析小兴安岭过伐林内光照条件及植被演替规律

Analysis on the Light Conditions and Vegetation Succession Law of Over-logged Forest in Xiao Xing'an Mountains

针对小兴安岭伊春林区的过伐林,通过均匀机械布点的方式调查林内光照条件分布状况,利用冠层仪观测手段定量计算观测点的郁闭度作为光照条件的分析指标;同时通过植被分层频度调查研究过伐林下植被的演替趋势。结果显示,过伐林中虽然红松种群在更新层和演替层都有较好的分布频度,具有进展演替恢复阔叶红松林的潜力,但是由于过伐林的整体郁闭度偏大,近半数区域的郁闭度都在0.8以上,对演替层红松幼树的生长有较大的影响,需要采取合理的透光抚育经营措施。

According to theover-loggedforest of Yichun in Xiao Xing＇ an Mountains,investigatethe distribution of light condition in the forest by means of uniform mechanical distribution,anduse canopy observation method to measure and calculate as an index of illumination analysis; Meanwhile,investgatethe succession trend of vegetation under the forest through the frequency of vegetation. The results showed that the populations of Pinus koraiensis had better distribution frequency in the regeneration layer and the succession layer,and had the potential for succession. However,since the overall canopy density of the over-logged forest is too large,more than half of the crown densityareas were above 0.8. which have great influence on the growth of the young trees of Pinus koraiensis of the succession layer,and needs reasonable crown thinning and management measures.