表土在彭湖高速公路低缓边坡生态恢复中的应用

Application of topsoil resources in ecological restoration of gentle slopes along Pengze-Hukou highway,Jiangxi Province

选取江西省彭泽至湖口高速公路沿线5个典型低缓边坡试验点,利用表土生态恢复,采用样线法调查1年后的试验边坡植物的生长情况。结果表明:在彭湖高速公路低缓边坡利用表土资源进行边坡生态恢复是可行的,各种利用表土的试验设计均取得了较好的恢复效果,其中,边坡覆盖7～10cm中层厚度表土后采取人工撒播恢复方式,边坡植物群落的Simpson多样性指数(平均0.80)及Pielou均匀度指数(平均0.84)相对较高,恢复效果较好;同时,此试验条件下生物量的积累值(平均446g.m-2)和木本植被的群落重要值(平均14.5)都显著高于其他恢复方式,这有利于群落结构的稳定和延续。

Selecting five representative gentle slopes along the Pengze-Hukou highway in Jiangxi Province of China as experimental sites, topsoil was applied to carry out ecological restoration,and line transect method was adopted to investigate the plant growth on the slopes one year later.It was feasible to take advantage of topsoil resources on the ecological restoration of the highway’s gentle slopes. Satisfactory results were obtained by implementing all experimental designs,among which, covering the gentle slopes with 7-10 cm depth of topsoil and artificially broadcasting plant seeds made the plant community structure on the slopes reached the initial stage of succession, with higher Simpson diversity index （averagely 0.80） and Pielou evenness index （averagely 0.84） and significantly higher biomass accumulation （averagely 446 g·hm^-2） and woody importance value index （averagely 14.5）, being an available approach for the stability and continuity of plant community structure on the gentle slopes.