河南省代表性土壤导气性能研究

Typical Soil Air Conductivity of Henan Province

在实验室内利用一维瞬态法对重新装填的取自河南省洛阳、郑州、南阳、鹤壁和驻马店等五个地区代表性土壤的导气率进行了测量,分析了土壤类型、容重等因素对土壤导气率的影响.实验结果表明:土壤质地和结构对土壤导气率有较为明显的影响,同一容重条件下洛阳粉土与南阳粉土的导气率相近,均低于郑州与鹤壁砂粉土的导气率,在所试验的三个容重(1.3,1.4,1.5 g/cm3)条件下取自南阳地区的粉土导气率最低,取自郑州的砂粉土导气率最高.五种土壤的导气率均随容重的增加而减小,不同类型的土壤在相同情况下导气率减小的程度不同,并且导气率与土壤容重之间存在显著的指数函数关系.

In laboratory,air permeability of reload five kinds of soils from Luoyang,Zhengzhou,Nanyang,Hebi and Zhumadian were measured by the one-dimensional transient method,and the effects of the soil type and bulk density on soil air permeability were investigated.Experimental results showed that soil texture and structure have a more significant impact on the soil air conductivity.Under the same condition of bulk density soil air conductivity of silt in Luoyang and Nanyang is similar,and lower than that of Zhengzhou and Hebi sand silt,and under the condition of three tested bulk densities（1.3g/cm 3,1.4g/cm3,1.5g/cm3） soil air conductivity of Nanyang silt is the lowest of all,and that of Zhengzhou sand is the highest.All five kinds of soil air conductivities decrease with the bulk density increase,and under the same condition different types of soil has a different decrease degree of soil air conductivity,and there is a significant exponential relationship between soil air conductivity and bulk density.