泰安棕壤土导气率与饱和导水率关系初步研究

A Preliminary Study on the Relationship Between Soil Gas Conductivity and Saturated Water Conductivity of Brown Soil in Tai'an City

为分析土壤导气与导水间的关系,本研究在前人研究的基础上,应用单环入渗法和三维稳态土壤导气率测量法测定泰安地区棕壤土饱和导水率与导气率,研究入渗环直径对饱和导水率的影响并建立导气率与饱和导水率关系模型。结果表明,随着入渗环直径的增大,入渗速率和累计入渗量逐渐减小,入渗速率和累计入渗量最大的是直径10 cm入渗环,20 cm入渗环次之,30 cm入渗环最小;利用直径10、20和30 cm的入渗环得到的饱和导水率具有明显差异性;通过拟合导气率与饱和导水率的关系曲线,发现导气率与饱和导水率两者之间存在较明显的对数关系,拟合关系曲线R20.8741,相对误差较小,可用于泰安地区棕壤土土壤饱和导水率预测。

In order to analyze the relationship between soil air permeability and saturated water conductivity characteristics,the single ring infiltration method and the three-dimensional steady state soil permeability measurement method were used to measure the saturated water conductivity and air permeability of brown soil in Tai'an city.The influence of the different diameter infiltration rings on the saturated water conductivity was studied,and the relationship model between the air permeability and saturated water conductivity was established.The results showed that the infiltration rate and cumulative infiltration amount decrease gradually with the increase of the diameter of infiltration ring,the infiltration rate and the cumulative infiltration amount was the largest with a diameter of 10 cm,followed by 20 cm,and the smallest with a diameter of 30 cm.Meanwhile,the significant differences were found in the values of saturated water conductivity with different infiltration ring diameters.Then,the relationship between gas conductivity and saturated water conductivity was discussed by using saturated water conductivity model and gas conductivity model.Through the logarithmic relation curve of saturated water conductivity and gas conductivity,it could be found that there was a significant logarithmic relation between air permeability and saturated water conductivity,and the R2 of the fitting relation curve was up to 0.8741,indicating that it was feasible to estimate the saturated water conductivity of brown soil in Tai'an city.