城市小区绿地入渗试验研究

对裸地、草坪等城市绿地进行入渗试验,得到土壤含水率、土壤容重、土壤入渗率等入渗试验参数,分析了前期降雨对绿地土壤含水率的影响,获得了试验期间裸地、草坪不同土层土壤含水率与前期影响雨量的线性关系,以及不同容重条件下裸地土壤的入渗率变化规律。试验获得了不同绿地类型初始入渗率、稳定入渗率、平均入渗率、累计入渗量等特征参数,研究了裸地、草坪入渗率与入渗历时的相关关系,分析了影响绿地入渗能力的主要因素。结果表明,土壤下渗过程中形成土壤水的比重相对于形成土壤孔隙重力水的比重小,裸地、草坪的土壤入渗速率主要与土壤容重有关,即与土壤压实度、土壤孔隙等因素有关,与土壤含水率和前期影响雨量的关系不大。

Experimental Study on Infiltration of Green Space at Urban District

Through the soil infiltration experiments of bare land,lawn land and other urban green land,experimental parameters such as soil moisture content,soil bulk density and soil infiltration rate were obtained.The influence of ante-cedent rainfall on soil moisture content of green land was analyzed.The linear relationship between antecedent rainfall and soil moisture content of different soil layers in bare land,lawn land during the experiment were obtained.The change rules of infiltration rate of bare soil under different bulk density were analyzed.The initial infiltration rate,stable infiltra-tion rate,average infiltration rate and cumulative infiltration amount of different types of green land were obtained.The correlation between infiltration rate and infiltration duration of bare land,lawn land was studied.The main factors affecting infiltration capacity of green land were analyzed.The results show that the proportion of soil water formed during in-filtration was smaller than that of pore gravity water.Soil infiltration rate of bare land,lawn land was mainly related to soil bulk density,soil compactness and soil porosity etc.but it has little relationship between soil moisture content and antecedent rainfall.