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为了确定落叶松人工林中不同因子对林下草本植物多样性的影响,在塞罕坝机械林场对林下草本植物展开调查。通过对调查资料进行相关分析和逐步回归,得出不同生境因子和林分因子对草本物种丰富度、多样性指数及均匀度指数的影响程度。结果表明:1)生境因子中海拔对丰富度指数S正相关显著,对多样性指数和均匀度指数相关性不显著;坡向与各指数均不显著;坡度与Simpson多样性指数D及基于Simpson多样性的均匀度指数J_(si)负相关极显著,对Shannon-Wiener多样性指数H及基于Shannon-Wiener多样性的均匀度指数J_(sw)负相关显著,说明坡度对Simpson指数的影响甚于Shannon-Wiener指数。2)林分因子中林分密度和郁闭度均对H及J_(sw)正相关极显著,对J_(si)正相关显著,说明落叶松人工林林分密度和郁闭度对Shannon-Wiener指数的影响比对Simpson指数的影响更敏感;林龄对S及H正相关极显著,对J_(sw)正相关显著。
In order to determine the influence of different factors on the diversity of understory herbaceous plants in Larch plantations, the understory herbs were investigated in the Saihanba mechanical farm. Through the correlation analysis and stepwise regression on the survey data, the influence of different habitat factors and stand factors on the species richness, diversity index and evenness index of herbaceous species was obtained. The results showed as follows: 1) The elevation of habitat was positively correlated with the abundance index S, but not significant with diversity index and evenness index; the slope and index were not significant; The negative correlation of diversity index J_ (si) was extremely significant, and negative correlation was significant between Shannon-Wiener index H and Shannon-Wiener diversity index J_ (sw), which indicated that the influence of slope on Simpson index At Shannon-Wiener index. 2) Stand density and canopy density were both significantly positive for H and J-sw, and positively correlated with J_ (si), indicating that the stand density and canopy density of Larix gmelinii plantation affected Shannon- The effect of Wiener index was more sensitive than that of Simpson index. The positive correlation between S and H was significant and the positive correlation was significant between J and (sw).