Study on Ecological Restoration of Vegetation Along Laoying Section of Dabao hingway

27 Mar Study on Ecological Restoration of Vegetation Along Laoying Section of Dabao hingway

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Abstract

路域植被生态系统的恢复与重建不仅是道路生态学的重要研究内容 , 而且也是恢复生态学的重要研究领域。 以大保高速 公路老营段路域植被生态系统为对象, 对比分析了 8种植被恢复模式的作用效果与作用机理 。研究结果表明, 在相同的恢复时 间内, 自然恢复的植物群落中本土植物的比例相对较高, 自然恢复是该区路域植被恢复的理想模式之一。 随着恢复演替时间的 推移, 所有群落中木本植物的比例不断增加, 草本植物的比例不断下降, 植物群落分层现象明显, 植物群落向原生植被发生进展 或偏途演替。 补播本土植物是促进植被恢复演替进程的主要途径之一, 不仅可以增加乡土物种的比例、增加植物群落的多样性 和均匀度, 而且随着恢复时间的推移, 可以形成层次明显、功能群组合合理的植物群落。 人工蓝桉经济林不仅降低了植物群落 及各功能群的多样性 、丰富度和均匀度, 而且在一定程度上增加了潜在生态风险。 研究结果还表明, 植物群落中当地物种的比 例、植物群落的物种多样性和植物群落的盖度可以作为植被恢复成功与否的重要判定指标。

English Abstract

Restoration of roadside vegetation restoration is a key issue in both road ecology and restoration ecology.In order to cealrify the effect of restoration practices and restoration duration on process and mechanism of vegetation restoration,a case study was done on the reforested lands which were over-cultivated with agricultural development and rural growth along Laoying Section of Dabao Highway,Longitudinal Range-Gorge Region of Yunnan Province.There are 8 different reforest practices(RP),which are operationally natural restoration or planting with different tree seedlings.The proportions of native species and funactional groups(tree,shrub and herbage) in vegetation composition by recording the plant species in the different restoration plots(5-8 hm2 each in sizes).Plant coverage,height and species diversity of both plant community and functional groups were investigated and similarities of different communities were identified by randomly investigating three 10m脳10m quadrats.The results show that the species composition,plant cover and species diversity of replanted communities varied with reforest strategies and time.Higher species number,proportion of native species and woody plants,canopy cover and species diversity can be can be found in the plots that were naturally restored plots or replanted with native trees.Preliminary conclusion can be drawn that plant coverage,species diversity might be used major indicators to assess the ecosystem function status in vegetation restoration.Natural restoration or reforestation with native dominant plants can be reasonable choice for vegetation restoration or improvement along roadside of Dabao Highway.