WANGXiu-heng,QURui-zhuo,WANGQi-kai,et al.Effect of Snowmelt Agent on Soil Salinity in Bioretention Pond[J].China Water & Wastewater,2023,39(1):118-125.
Effect of Snowmelt Agent on Soil Salinity in Bioretention Pond
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
118-125
Column:
Date of publication:
2023-01-01
- Keywords:
- sponge facility; bioretention pond; snowmelt agent; soil salinization; leaching; HYDRUS-1D
- Abstract:
- To investigate the influence of winter snowmelt agent on urban sponge facilities in northern China, the water and salt migration model of bioretention ponds in a representative city Dalian was constructed by column experiment and HYDRUS-1D software based on meteorological data and statistical snowmelt agent dosage, and the salinization degree of bioretention ponds after the dispersal of snowmelt agent in winter and the leaching of soil salt after spring rainfall were analyzed. Winter simulation results in 2015 showed that multiple uses of snowmelt agent in winter resulted in a gradual increase in the electrical conductivity (EC) of the soil from bioretention ponds and a gradual accumulation of salinity in the soil. Before spring leaching, the EC values of the planting soil surface such as silt loam, loam and sandy loam were as high as 52.30 dS/m, 55.35 dS/m and 44.87 dS/m, respectively. In the spring of 2016, the salt in the soil was fully leached when there were heavy rainfall and sufficient rainwater, so the EC value of the soil was lower than the threshold of soil salt damage. The simulation results showed that the EC value of planting soil layer was higher than that of the replaced soil layer, which was not conducive to plant survival. Compared with the silt loam and loam bioretention ponds, the sandy loam bioretention pond had a larger soil pore, less salt accumulation and lower soil salinization degree. When the rainfall was small, the sandy loam bioretention pond was beneficial to reduce the retention of salt and accelerate the discharge of salt, so it could be preferred as a salinization resistant planting soil. In addition, the simulation results of excessive use of snowmelt agent in winter showed that increasing the dosage of snowmelt agent would cause more serious soil salinization, and the application of sandy loam bioretention pond was conducive to spring rainfall leaching.
Last Update:
2023-01-01