高速公路边坡植物群落物种多样性

运用区组试验设计,于沪陕高速公路信阳至南阳段4种路基边坡建立了28个植物群落观测试验小区。在测定相关指标的基础上,对不同土壤类型边坡物种多样性指标进行了比较分析,同时研究了路基边坡物种多样性与植被因子的相关性。结果表明:"紫穗槐+狗牙根+高羊茅"群落和"胡枝子+狗牙根+高羊茅"群落的物种多样性指数、丰富度指数及均匀度指数较高;物种多样性指标之间相关性显著;多样性指数、丰富度指数、均匀度指数与地上生物量相关性较强,与高度、盖度、保土作用系数相关性较差;植被保土作用系数与植被覆盖度密切相关,与植株高度的相关性显著。

Species Diversity of Plant Community on Highway Slope

According to group test planning,28 plots of plant communities were established along the road slope of Hushaan Highway between Xinyang and Nanyang.Species diversity indices of the plants growing the slopes with different soil types were compared.Relationship between vegetation factors and species diversity was studied.The results showed that the correlations among the Shannon Weiner index,Margalef index and Pielou index of two communities were relatively higher: Amorpha fruticosa+ Cynodon dactylon+Festuca elata community,and Lespedeza bicolor+C.dactylon+Festuca elata community.A significant relationship was observed among species diversity indexes.The Shannon Weiner index,margalef index and pielou index were related remarkly with aboveground biomass,while there was a poor correlation between species diversity indices and the vegetation height,the vegetation coverage and the coefficient of soil conservation.The coefficient of soil conservation was closely related to the vegetation coverage,and remarkable correlated to the vegetation height.