杉木人工林及其采伐迹地林下植被物种多样性研究

对中国科学院会同森林生态实验站实验林场的杉木人工林及其采伐迹地撂荒而形成的林下植被群落进行了物种多样性分析和比较。结果表明,人工林与撂荒地相比,物种组成上有明显差异,但人工林林下物种多样性与撂荒地相比,差异不明显。杉木人工林和撂荒地的灌木、草本、藤本3层物种丰富度分别为56、38、41和79、40、38;Simpson多样性指数分别为0.935、0.931、0.828和0.944、0.948、0.830;均匀度指数分别为0.228、0.247、0.218和0.216、0.254、0.222。物种多样性差异不明显的主要原因是风倒木和干死木导致人工林乔木层郁闭度减小,增加了林下的光照,从而改变了林下的小生境。

The species diversity of undergrowth plant in Chinese fir plantation and the vegetation of the deserted land

The species composition and species diversity of Chinese fir plantation and the vegetation of the deserted land by felling were compared and analyzed. All of these were conducted in Experiment Forestry Center of Forest Ecology Experiment Station of Chinese Academy of Science in Huitong.The result indicates that there is significant difference in species composition between the plantation and the deserted,but the species diversity has no significant difference between them.The species abundant degree of shrub,herb and liana layers in the plantation and the deserted land are 56,38,41 and 79,40,38 respectively.The indices of Simpson diversity of the three layers are 0.935,0.931,0.828 and 0.944,0.948,0.830 respectively.The indices of even degree of distribution are 0.228,0.247,0.218 and 0.216,0.254,0.222 respectively.The main reason of no significant difference in species diversity may be the decrease of the coverage degree of the tree layer of Chinese fir plantation caused by flowing dead wood and standing dead wood.As result,light rays increased in undergrowth and consequently changed the undergrowth microenvironment.