高海拔原始暗针叶林采伐迹地次生植被结构与物种多样性比较

Vegetation Structure and Species Diversity of Secondary Vegetation on High Altitude Dark Brown Coniferous Forest Cut Land

研究高海拔原始暗针叶林次生植被结构与物种多样性,用物种丰富度指数S、Shannon-Wiener指数H、Simpson生态优势度SN和Pielou均匀度指数JSW分析不同恢复时间序列次生植被各层次物种多样性的变化.结果表明:随着恢复时间的增加,次生植被在垂直结构上,灌木高度总体呈增加趋势,草本高度变化不明显;在水平结构上,灌木层盖度与草本层盖度变化一致,都呈增加趋势;次生植被物种出现了消长变化,灌、草层优势种发生了变化;灌木层Shannon-Wiener指数H随着恢复时间的增加而增大,草本正好相反.群落优势度指数与均匀度指数、Shannon指数以及物种丰富度呈相反的变化,原因可能是在恢复时间梯度上,优势种和亚优势种的变化改变了群落优势度.

The vegetation structure and species diversity of secondary vegetation on high altitude dark brown coniferous forest cut land were studied by using species richness index（s）,Shannon-Wiener index（H）,Simpson ecologe dominance index（SN）,Pielou evenness index（Jsw）.The results showed：the height and coverage become larger along cutting time gradients;the Shannon-Wiener index（H） of shrub become larger along cutting time gradients;the Simpson（SN） index become smaller because of the change of dominant species dand subdominant species.