原状土与扰动土导气率、导水率与含水率的关系

为分析土壤导气特性与土壤导水特性间的关系,该文通过研究陕西杨凌小麦试验田士样导水率和导气率随含水率的变化特征,比较原状土与扰动土导气和导水特征,分析相对导水率和相对导气率与饱和度的关系,结果发现导水率随含水率的增加而减小,且无论导水率还是导气率原状土都比扰动土大,证实土壤结构及孔隙特征对水和气的传输有巨大的影响,扰动土和原状土变化趋势虽然基本相同,但曲线不重合,说明扰动土和原状土的孔隙连接性和弯曲程度不尽相同.

Relationship between air permeability, water conductivity and water content for undisturbed and disturbed soils

In order to analyze the relationship between soil air permeability characteristics and soil water conductivity characteristics, the variational characteristics of soil air permeability and water conductivity with the change of soil water content were studied, the air permeability characteristics and water conductivity characteristics for both undisturbed and disturbed soils were compared and the relationship between relative air permeability, water conductivity and water saturation were analyzed of wheat lands soil samples in Yangling of Shannxi province. The results show that soil water conductivity decrease with water content increasing and Water conductivity and air permeability for undisturbed soils is higher than that for disturbed soils, which confirms that soil structure and pores characteristics have enormous impact on the transport of water and air. In addition, although the variational tendency of these characteristics between undisturbed and disturbed soils is almost same, but curves of their variational tendency are not completely alignment. It can be concluded that the pore connectivity and bending degree are different between undisturbed and disturbed soils.