蒙古栎林天然更新状况及影响因素研究

Characteristics and Influencing Factors of Natural Regeneration of Quercus mongolica Forest

基于吉林省中东部地区68块（30m×30m）蒙古栎林标准地的调查数据，统计蒙古栎林天然更新幼苗幼树，对影响林分更新的林分条件和地形条件进行分析探讨．结果表明：研究区域内天然蒙占栎林更新树种37种，平均更新苗密度达到7219株／hm2，其中蒙古栎数量占更新总量的近40％，山楂、花曲柳和春榆占更新总量的1／3；从更新类型上看，幼苗和幼树所占比例分别为22．2％和77．8％．同时发现，林分平均胸径达16～200cm、密度为400～800株／hm2（郁闭度为0．60～0．69）的林分更新数量最高；从不同地形条件更新数量上看，山坡中上部更新数量较高，坡向的影响表现为半阳坡〉半阴坡〉阴坡〉阳坡，坡度的表现为平坡〈缓坡〈斜坡〈陡坡．

Abstract： We investigated the regeneration quantity and regeneration tree species of Q. mongolica forest, and analyzed the impact factors, stand condition and topographic condition of natural regeneration base on the field vegetation survey in 68 plots （30 m × 30 m） of Q. mongolica forest in Mid-Eastern Jilin Province. The results showed that there were 37 kinds of natural regeneration trees species of Q. mongolica forest in the survey plots, where the Q. mongolica quantity accounted for 40% of all regeneration quantity, and the total of Crataegus pinnatifida Bunge ,Fraxinus rhynchophylla and Ulmus japonica was 1/3. The density of natural regeneration was 7 219/hm2 with 22.2% seeding and 77.8% sapling. The regeneration quantity in the forest with the mean DBH from 16 cm to 20 cm was higher,which was the highest in the forest with 400 -800/hm2 and in the forest whose canopy density with 0.60 - 0. 69. The number of seeding and sapling increased at first and then decreased with the canopy density increasing. The regeneration number of the forest with upper part of the hillside was higher. Then the amount of regeneration with the different aspects were in sequence of half-sunny slop 〉 half shaded slope 〉 shady slope 〉 sunny slope. The magnitude of regeneration of forests with the different slopes were in order straight slope 〈gentle slope 〈slope 〈steep slope.