【摘要】 根据宁夏高等级、高速公路绿化用地的特殊性，提出绿化功能要求与设计原则，并对不同公路绿化用地的绿化设计进行阐述，提出绿化材料种植中应注意的问题。更多还原

【Abstract】 ： The paper analyses the particularity of afforesting land for higher grade read and express highway in Ningxia.The paper also presents designing principle and function of afforesting and some observing problems in the Process of planting,and elaborates the designing of the different greening lands.更多还原