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为了解抚育间伐对华北落叶松纯林林下植被的影响,对河北省木兰林管局600,900,1 200,1 500株/hm2共4种不同密度华北落叶松人工林林下植被进行了调查。结果表明,华北落叶松人工林林下植被物种丰富度,平均高度、平均盖度、平均密度、植物多样性指数随着保留密度的增大而减小,且密度600株/hm2和900株/hm2落叶松林下植被的各项指标都相接近,与其它2种密度林下植被相差较大;较小密度之间的林下植被物种组成相似程度较大,较大密度和较小密度落叶松之间林下植被物种组成差异较大;40 a生左右、平均高为11m、密度为1 500株/hm2的华北落叶松间伐保留密度为900株/hm2较为合理。
In order to understand the effect of thinning on the understory vegetation of pure Larix principis-rupprechtii plantations, four species of Larix principis-rupprechtii plantations at 600, 900, 200 and 1 500 plants / hm2 were surveyed. The results showed that the species richness, average height, average coverage, average density and plant diversity index of understory vegetation of Larix principis-rupprechtii plantations decreased with the increase of reserve density, and the density of 600 plants / hm2 and 900 plants / hm2 larch understory vegetation indicators are close to each other with the other two kinds of density undergrowth difference between the larger; lower density between the understory vegetation species composition is relatively large, the larger the density and the smaller density larch The species composition of understory vegetation varied greatly. About 40 years old, with an average height of 11 m and a density of 1 500 plants / hm2, Larix principis-rupprechtii could reserve more than 900 plants per hectare.