大循高速公路边坡植被恢复植物种组合筛选试验研究

Research on Plant Combination Screening for Vegetation Restoration on the Slope of Dalijiashan-Xuhua Expressway

我国西北寒旱区气候干旱、降雨量小,植被的立地条件差,在开展高速公路建设时会产生大量劣质边坡,亟需开展生态防护和植被恢复工程。依托青海省大循高速公路建设项目,开展劣质边坡生态防护试验工程,通过设置不同草本、灌木植物组合,结合定期植被恢复效果观测,探究适用于青海省高速公路边坡的植物种。结果表明,采用不同草本搭配和灌木的配置形式应用于寒旱区高速公路边坡植被恢复的效果较差,受到寒旱区恶劣环境以及高速公路边坡特征的影响,宜采用单一的植被配置形式进行边坡植被恢复,植物种建议优选老芒麦、青海中华羊茅和同德小花碱茅等草本植物。

There are a large number of low-quality slopes in highway construction due to the dry climate,low rainfall and poor site conditions of vegetation in northwest China.These slopes are in urgent need of ecological protection and vegetation restoration.The ecological protection of inferior slope is carried out based on the construction project of Dalijiashan-Xunhua Expressway in Qinghai Province.Different herbaceous and shrub plant combinations are selected and the observations of vegetation restoration effect are used to explore the plant species suitable for the high slope.The results show that the use of different herb combinations and shrubs applied to the vegetation restoration on the slope of the expressway in cold and arid areas is poor.Affected by the harsh environment in the cold and arid areas and the characteristics of the expressway slope,a single vegetation configuration form should be adopted.For slope vegetation restoration,it is recommended to select herbaceous plants such as old awn wheat,Qinghai fescue and Puccinellia tenuiflora.