典型旱地红壤水力学特性及其影响因素研究

为了更系统地了解旱地红壤供水与贮水能力、有效水含量及其变化范围,按自然发生层采集旱地红壤原状土样,对其进行了水力学特性和影响因素研究.结果表明,旱地红壤原状土饱和导水率变化范围为1.44×10-3～3.45×10 3 cm/s,并呈现自上而下减小的趋势.从旱地红壤水分特征曲线得出剖面各层土壤的饱和含水量、田间持水量、萎蔫含水量和有效水含量,其中有效水含量变化区间为0.083～0.124cm3/cm3,耕作层最高.在旱地红壤水力学特性的影响因素研究中,容重、质地、有机质含量和结构系数均与水力学特性呈一定的相关性,其中容重和孔隙度为旱地红壤水力学特性的主要影响因素.

Hydraulic Characteristics and Its Impact Factors in Typical Red Soil Region

To understand water storage capacity,varying range of available water in typical red soil more systematically,and undisturbed red soil samples in soil profiles were collected.The soil hydraulic characteristicsand impact factors also were studied.The results showed that the range of undisturbed soil saturated hydraulic conductivity was between 1.44×10^-3 and 3.45×10^-3 cm/s.Its value decreased from top to bottom.Thesaturated water content,field capacity,wilting water and available water were figured out from the soilmoisture characteristic curves.Available water content varied from 0.083to 0.124cm³/cm³,and surface soillayer was the largest one.There were some correlations between hydraulic characteristics and its impact factors,such as bulk density,soil texture,organic matter content and soil structure coefficient.The soil bulkdensity and porosity were the main impact factors.