上海市绿地土壤渗透性调查及改良

Field Survey and Improvement for Soil Infiltration Characteristics of Urban Green Land in Shanghai

该文研究了上海市不同功能区公共绿地土壤的渗透性,并分析了草地和种植灌木土壤渗透性的差异及其主要影响因素,结果表明:上海市绿地土壤的渗透性差异较大,一般来说,草地土壤渗透系数小于灌木土壤的渗透系数,主要是因为草地压实现象普遍,土壤容重增大,孔隙度下降,而灌木区受到踩踏的程度低、根系能增加土壤的通透性,因而渗透性能较好。通过实验室土壤渗透性改良试验,确定了通过添加改良基质使土壤达到国外生物滞蓄系统渗透速率要求的具体方法,为构建符合上海地方特色的生物滞蓄系统的种植/渗滤层提出了建议。

Field survey of infiltration in different functional urban green areas in shanghai was carried out. The differences between the final infiltration rates of lawn and shrub and the major influencing factors were analyzed. The results show there are significant dif- ferences in infiltration rates of different green lands. Generally speaking, the infiltration rate of lawn is lower than that of shrub due to the compaction of soil, higher bulk density and lower porosity for lawn. The roots of the shrub can improve the permeability. Detail measures of improving soil media infiltration were investigated. Some suggestions for how to meet the need of infiltration media for the bioretention system were presented, which would be helpful to develop bioretention system in Shanghai to control runoff pollution.