紫金山栓皮栎枫香混交林群落结构与物种多样性

为了明晰紫金山栓皮栎枫香混交林植物多样性,主要从乔木层各物种的重要值、优势种群年龄结构以及物种多样性指数、物种丰富度指数、物种均匀度指数等方面进行了调查与分析。结果表明,在紫金山栓皮栎枫香混交林中,共有植物59科93属102种。乔木层中栓皮栎、枫香和马尾松在群落中占据优势地位,三者重要值之和高达77.88%。其中栓皮栎近似于稳定型种群,枫香属于典型的增长型种群,马尾松属于典型的衰退型种群,在未来的一段时间内,栓皮栎和枫香将继续成为该地区的优势种,而马尾松则会被更新能力更强的物种所取代。群落中灌木层的Simpson指数和Shannon-Wiener指数均最大,分别为0.948和3.370;其次是草本层,分别为0.894和2.480;乔木层最小,分别为0.717和1.690。物种丰富度指数乔木层和草本层相近,分别为24和22;灌木层最大,值为68。Pielou均匀度指数灌木层和草本层相近,分别为0.799和0.802;乔木层最小,值为0.532。

Plant diversity in a mixed plantation of Quercus variabilis and Liquidambar formosana in the Zijinshan Mountion

In order to understand the plant diversity in a mixed plantation of Quercus variabilis and Liquidambarformosana in the Zijinshan Mountain,the importance values of the tree layer species,the age structure of the dominant populations and the species diversity,richness and species evenness were analyzed.The results showed the mingled forest of Quercus variabilis and Liquidambarformosana had 102 species belonging to 59 families,93 genera.In the tree layer,Quercus variabilis,Liquidambarformosana and Pinus massoniana had the dominant positions,and the sum of the importance values of the three species reached 77.88％.Quercus variabilis in this community approximated to the stable population and Liquidambarformosana was a typical growing population.Pinus massoniana appeared to be a typical decreasing population.In the future,Quercus variabilis and Liquidambarformosana will continue to be the dominant positions in this area,but Pinus massoniana will be replaced by the species that has better renewal capacity.In this community,the Simpson's and Shannon-Wiener's indices of the shrub layer were the greatest,followed by the herb layer and the tree layer.The Simpson's and Shannon-Wiener's indices of the shrub layer,the herb layer and the tree layer were 0.948 and 3.370,0.894 and 2.480,0.717 and 1.690,respectively.The species richness index of the tree layer was close to that of the herb layer,which was 24 and 22,respectively.The shrub layer had the greatest species richness index of 68.The Pielou's index of the shrub layer was close to that of the herb layer,which was 0.799 and 0.802,respectively.The tree layer had the smallest Pielou's index of 0.532.