A survey was conducted on species, quantity, coverage and height of undergrowth vegetation in a Larix principis-rupprechtii plantation. Effect of thinning intensity on the biodiversity of undergrowth vegetation was studied by Simpson index,Shannon-Wiener index and Gleason index. Results showed that the species and quantity of undergrowth vegetation in the L. principis-rupprechtii plantation gradually increased with increasing thinning intensity. The species of undergrowth vegetation in sample plots under different thinning intensities were 1.2-2. 1 times as many as the control ( without thinning).The species richness and diversity of undergrowth vegetation in the sample plots under different thinning intensities were also higher than those in the control, and the sample plot under high intensity thinning exhibited the highest species richness and diversity. Height and coverage of undergrowth vegetation in sample plots under different thinning intensities increased with increasing thinning intensity, and the vertical community structure became clearer under the high intensity thinning.%调查了华北落叶松(Larix principis-rupprechatii)人工林间伐林分和未间伐林分林下植物的种类、数量、盖度和高度,采用Simpson指数、Sharnon-Wiener指数和Gleason指数进行多样性测度分析,探讨不同间伐强度对华北落叶松人工林林下植物多样性的影响.结果表明:随着间伐强度的加大,华北落叶松人工林林下植物种类、数量明显增加;不同间伐强度区林下植物种类高于对照区1.2～2.1倍;不同间伐强度林分林下植物种类的丰富度和多样性明显高于对照区,以强度间伐最为明显;不同间伐强度林下植物的高度和盖度随间伐强度的加大而加大,在强度间伐区中可明显看出林下植物的结构层次.
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