坡面和坡向对遂渝铁路岩石边坡创面人工土壤植被恢复的影响

针对采用客土喷播人工土壤进行植被恢复的铁路边坡,对铁路边坡岩石创面人工土壤植被的盖度、高度、根深、根幅、地上生物量、地下生物量和多样性指数在不同坡位、坡向的空间变异性进行了观测研究.结果表明,铁路边坡植被盖度在不同坡位之间存在明显差异,表现为坡下(87%)>坡上(31%)>坡中(19%).铁路边坡坡位对植被的盖度、高度、Pielou均匀度指数有显著影响,但对根深、根幅、地上生物量、地下生物量、Marglef丰富度指数和Simpson多样性指数的影响不显著.铁路边坡坡向对植物群落的Pielou均匀度指数有显著影响,表现为西坡>北坡>南坡>东坡,但对Simpson多样性指数、Marglef丰富度指数以及植被的盖度、高度、平均根深、根幅、地上生物量、地下生物量的影响均不显著.

Effects of Slope Posiion and Aspect on Vegetation Restoration of Excavated Soil Surface on Suiyu Railway Rock Slope

The spatial variability of vegetation coverage, height, root depth and breadth distribution, aboveground and belowground biomass, and biodiversity were measured on different slope position and exposure of excavated rock soil surface after vegetation restoration by spray seeding technique and incorporation with extra soil. The results showed that significant difference of vegetation coverage variability existed on different slope positions, in the same slope, the value rank as: down-slope(87%)>up-slope( 31%)>mid-slope(190o)along the same slope. Slope position has significant effects on vegetation cover, height and Pielou evenness of plant communities, the effects on root depth and breadth, aboveground and underground biomass, Marglef species richness and Simpson abundance were in- significant. Slope aspect also has significant effects on Pielou evenness index of plant communities, the rank of spatial variability is western-slope>northern-slope>southern-slope>eastern-slope, no significant effects on vegetation cover, height, root depth and breadth, aboveground and belowground biomass, Simpson diversity and Marglef abundance were detected.