塞罕坝落叶松人工林下植物多样性研究

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。

Study on Plant Diversity of the Larch Plantation in Saihanba

The investigation was conducted from July to August in Saihanba Forest Farm in order to de- termine how the different factors of the larch plantation affect the plant diversity.On the basis of sta- tistics of investigation data,effects of different factors on species richness,evenness and plant diversity were discussed.The results showed that altitude had significant positive correlation with S.Aspect had no relations with other factors.Slope had more significant positive correlation with D and Jsi than H and Jsw.The results demonstrated that the effects which were caused by slope were more sensitive to Simpson indexes.Density and cannopy density had more sensitive effects on Shannon- Wiener indexes than Simpson indexes.Age had significant positive correlation with S and H,but not Jsw.