成都市绿地土壤特性及对雨洪削减效应的研究

Study on the Characteristics of Greenland Soil and Reduction Effects on Storm Water Runoff in Chengdu

研究成都市锦江区5类城市绿地的土壤特性,分析各类绿地土壤的分布规律,建立锦江区绿地土壤对雨洪削减效应的估算模型。结果表明:锦江区绿地土壤质地以粉砂质壤土、粉砂质黏壤土和粉砂质黏土为主;城市绿地土壤受人为活动影响显著,物理性质发生了较大变化,土壤孔隙度和渗透性均下降;不同类型的绿地土壤入渗速率差异较大,以生产绿地和公园绿地为最好。绿地土壤对雨洪的蓄渗效果随土壤入渗速率的增大而增大,且下凹式绿地的蓄渗效果更佳。

In this paper,the soil characteristics of five urban green land in Jinjiang District of Chengdu City were studied,and the distribution rule of soil were analyzed.The estimation model of storm water runoff reduction effect was established.The results showed that the soil texture in Jinjiang District was silty loam,silty clay loam and silty clay.The soil of urban greenland was influenced by human activity,and the physical properties had changed greatly,and soil porosity and permeability had decreased.Different types of greenland soil infiltration rate were different,produce greenland and park greenland were the best.The effect of the red soil infiltration on the rainwater infiltration increased m th the increase of soil infiltration rate,and the effect of reservoir was better.