论文部分内容阅读
在东莞大岭山实验场对12年生的尾叶桉(Eucalyptus urophylla)人工林进行间伐和套种改造,设3种间伐强度(30%、70%、100%)处理,间伐后均套种阔叶树种,以不间伐纯林为对照;改造7 a后,比较不同间伐强度套种改造模式对群落物种组成、物种多样性和林分生长状况的影响。结果表明:与对照林分相比,乔木层的物种数明显增加,灌草层物种数差异不大,但其优势种有所变化;改造后各处理乔木层物种丰富度、Shannon-Wiener指数和草本层Pielous指数均高于对照,灌木层Shannon-Wiener指数和Pielous指数有所下降。整体来看,以间伐100%处理组的物种多样性指数最高,间伐70%处理组次之。林分套种树种的平均树高、胸径和胸高断面积均随着间伐强度的增大而增大;高强度改造(间伐100%)的尾叶桉人工林适合套种米老排和亮叶猴耳环等树种,该间伐套种模式能促进套种树种生长和林分天然更新能力。
The 12-year-old Eucalyptus urophylla plantation was planted in DaLingshan Experimental Station in Dongguan. Three kinds of thinning intensities (30%, 70%, 100% Compared with the control of no-gap pure forest, after 7-year reformation, the effects of different inter-thinning and inter-planting intensification patterns on community composition, species diversity and stand growth were compared. The results showed that compared with the control stand, the species number of arbor layer increased obviously, while the species number of shrub layer changed little, but the dominant species changed. The tree species richness, Shannon-Wiener index and The Pielous index of the herb layer was higher than that of the control, and the Shannon-Wiener index and Pielous index of shrub layer decreased. Overall, the species diversity index of the group with 100% thinning was the highest, followed by the group of 70% thinned. The mean tree height, DBH and area of thoracic and intercropping of intercropping tree species increased with the increase of thinning intensity. The Eucalyptus urophylla plantation with high intensity transformation (100% thinning) And other tree species, the thinning intercropping pattern can promote interplanting tree species growth and natural regeneration ability.