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以扎兰屯地区3种不同密度33年生兴安落叶松人工林为研究对象,分析兴安落叶松人工林下物种的重要值、丰富度指数、多样性指数、均匀度指数和相似系数随林分密度的变化规律。结果表明:兴安落叶松林下共出现植物11科29属31种。草本层物种组成、植物丰富度指数、多样性指数随着林分密度的增大,均先增加后降低。各指数与林分密度的相关性分析表明,草本层的多样性指数、草本层的均匀度指数与林分密度均表现出较高的相关性。随着林分密度增大,林下共有种减少,相似系数降低。人工林密度为1 751.89株/hm2时,林下草本层物种丰富度指数、多样性指数、均匀度指数均达到最高,表明此密度下兴安落叶松人工林群落稳定性最好。
Taking 33-year-old Larix gmelinii plantations with different densities in Zhalantun as the research object, the important values of species under Larix gmelinii plantations were analyzed. The indexes of richness, diversity, evenness and similarity were positively correlated with the stand density The law of change. The results showed that there were 31 species belonging to 29 genera, 11 families, under the Larix gmelinii forest. Herb species composition, plant richness index and diversity index increased first and then decreased with the increase of stand density. The correlation analysis of each index and stand density showed that the diversity index of herb layer, the evenness index of herb layer and the stand density showed a high correlation. With the increase of stand density, total species under the forest decreased and the similarity coefficient decreased. When the plantation density was 1 751.89 plants / hm2, the species richness index, diversity index and evenness index of understory herb layer reached the highest, indicating that the community stability of Larix gmelinii plantation was the best under this density.