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

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.

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

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 s...