大兴安岭落叶松林渐伐迹地天然更新调查研究

• 作 者: 于汝元 刘岩 李文巨 唐卫国 管风礼
• 机 构: 北京林业大学林业资源学院,内蒙古自治区满归林业局,
• 出 处: 北京林业大学学报
• 发表日期: 1990年S4期
• 关键词: 二次渐伐 渐伐 落叶松林 活地被物 天然更新 盖度 有效株数 地被物层 大兴安岭 更新频度

渐伐迹地多为1979年采伐形成,伐后9年问,迹地状况变化不明显,下木总盖度、活地被物盖度很大,死地被物层未得分解.第一次渐伐强度一般偏大,部分保留木受机械损伤,造成天然更新效果不良.用林冠下健壮稳定的更新株数评定,二次渐伐迹地中更新良好者占4.5%,更新中等者占18.2%,更新不良者占31.8%,更新差的占45.5%.更新频度低是普遍特点.杜香和草类林型中更新株数较多.

Most of the gradual cuts were mostly cut in 1979. After 9 years of cutting, there was no obvious change in the conditions of the tracks, and the total coverage of the understory and the floor cover of the living floor were very large. The first sub-cut The strength is generally too large, part of the preservation of wood by mechanical damage, resulting in poor natural regeneration effect.Under the canopy under the robust and stable updated number of assessment, the second sub-cut in the area of ​​good updates accounted for 4.5%, moderate update accounted for 18.2%, poorly updated Accounting for 31.8%, accounting for 45.5% of the poor.New update frequency is a common feature.Luixiang and grass forest more updated number of trees.