福寿林场杉木人工林林下植物物种多样性研究

选择3种不同龄组的杉木人工林，研究林下植物物种的组成及多样性的变化。结果表明，不同龄组杉木人工林在1 800 m²样地内林下植被的物种数在28～36之间，物种数差异不大，但其主要物种的生态习性差异明显。其中幼龄林30种，中龄林36种，成熟林28种。草本层的物种多样性指数 D在0.705 8～0.829 0之间、H在1.709 1～2.515 7之间，中龄林>幼龄林>成熟林。灌木层的物种多样性指数D在0.880 3～0.923 6之间、H在2.338 9～2.695 0之间，中龄林>成熟林>幼龄林，整体上灌木层高于草本层。

Species Diversity of Undergrowth Vegetation of Chinese Fir Plantations in Fushou Forest Farm

Taking Chinese fir plantations of 3 different age groups (young,middle-aged,and mature plantations) in Fushou Forest Farm as the study object,this paper analyzed and compared the composition of plant species and the changes of species diversity of undergrowth vegetations.The results showed that among three groups,there were about 28-36 plant species per 1 800 m² sampling plots,the number of species among different groups was not significant.However the ecological habits of the dominant species were significantly different among different age groups.The species richness of undergrowth vegetation of the young,middle-aged and mature plantations were 30,36,28,respectively.The species diversity indices of shrub layer D were 0.708-0.820,H were1 0.709 1-2.515 7,and in the order of middle-aged>young >mature.The species diversity indices of herb layer D were 0.883-0.9236,H were 2.339-2.690, and in the order of middle-aged>mature>young.The species diversity index of shrub layer was higher than that of the herb layer as a whole.