天然针阔混交林主伐后的群落恢复

Community Recovery after Natural Mixed Forests of Coniferous and Broadleaf Trees in Final Cutting

选择Ⅴ龄级天然针阔混交林,通过不同的采伐更新方式,获得较好的经济效益,采伐更新8年后,林分蓄积增长到伐前的79.6%,而且群落也得到较好的恢复。监测结果显示:强度择伐后因透光度的增加,阳性和中性树种侵入,地面芽植物和1年生的植物比例增加;第8年,群落的乔、灌、草各层的物种多样性指数已接近对照的天然针阔混交林。研究还发现,无论采用择伐更新还是皆伐人促更新,经过8年的恢复,林地土壤肥力已基本达到原有的天然次生针阔混交林。

Through selecting V stand age natural mixd forests of coniferous and broadleaf, and through different felling reproduction ways, forests were faster growth and the economic effect was relatively high.The stand stocking already reached the 79.6% level before the selection felling with 8-year- long forest conserration,and the community was rapidly recovered. The dynamic monitor resuh showed that the ground bud plant and 1-year-old plant proportions increased because of the transmittance＇s increasing sharply and the mass intrusions of heliophilous and indeterminate tree species after the selection felling of intensity.In the 8th year, the species diversity indexes of different layers of arbor, shrub and grass were higher than the index of natural broad leaved forest without management.The study also found that the soil nutrient loss was small,and the forest land soil fertility already reached the former natural forest land soil fertility level through the 8-year-long recovery.