北京地区下凹式绿地土壤渗透能力及蓄水对土壤物理性质的影响  

Soil infiltration capacity of sunken green space and the effects of water storage on soil physical properties in Beijing

作　　者：朱永杰[1] 毕华兴[1,2] 霍云梅 许华森[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]北京林业大学林业生态工程教育部工程研究中心,北京100083

出　　处：《中国水土保持科学》2015年第1期106-110,共5页Science of Soil and Water Conservation

基　　金：国家水体污染控制与治理重大专项"城市地表径流减控与面源污染削减技术研究"(2013ZX07304-001)

摘　　要：采用自制的模拟下凹式绿地,通过模拟不同设计暴雨强度条件下下凹式绿地的进水负荷,动态监测下凹式绿地在蓄水过程中土壤水分的渗透量和平均入渗速率,研究北京地区下凹式绿地在蓄积周边外来雨水径流过程中土壤水分的渗透规律以及蓄积雨水径流后对土壤孔隙及土壤密度的影响。结果表明:1)在土壤含水率基本相同的条件下,下凹式绿地土壤渗透性能在1、3、5年一遇暴雨情况下会随着暴雨强度的增加而增大;2)在设计暴雨强度一致时,土壤水分的渗透量和平均入渗速率没有明显差异,土壤密度小、总孔隙度大的渗透量和平均入渗速率更大;3)随着绿地蓄水次数的增多,土壤密度和总孔隙度变化较大,蓄水试验后,土壤密度由最初的1.33 g/cm3变为1.65g/cm3、总孔隙度由原来的50.06%变为39.18%。In order to analyze the law of soil water infiltration in the sunken green space,we monitored dynamically the permeation amount of soil moisture in the sunken green space and the average infiltration rate during the water storage process through simulating the influent water load of sunken green space at different rainfall intensities. The effect of collected rainwater runoff in the sunken green space on the soil porosity and bulk density during the process of collecting surrounding rainwater was explored. The results showed that： 1） Soil permeability in the sunken green space would increase with the increased rainstorm intensity at the heaviest rainfall once in 1,3 and 5 years provided that the soil water contents are under essentially the same condition. 2） At the same intensity of rainstorm,there was no obvious difference in the permeation amount as well as average infiltration rate; the average infiltration rate tended to be larger for the soil with lower bulk density and larger total porosity. 3） With the times of water storage increasing,soil bulk density and total porosity changed greatly： the bulk density increased from 1. 33 to 1. 65 g / cm^3,while the total porosity dropped from the original 50. 06% to 39. 18% after the water storage experiment.

关 键 词：下凹式绿地 暴雨强度 渗透量 平均入渗速率 

分 类 号：S157.5[农业科学—土壤学]