摘要
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。
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 characteristics and impact factors also were studied. The results showed that the range of undisturbed soil saturated hydrau- lic conductivity was between 1.44× 10^-3 and 3.45 × 10^-3 cm/s. Its value decreased from top to bottom. The saturated water content, field capacity, wilting water and available water were figured out from the soil moisture characteristic curves. Available water content varied from 0. 083 to 0. 124 cm^3/cm^3 , and surface soil layer 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 bulk density and porosity were the main impact factors.
出处
《水土保持通报》
CSCD
北大核心
2013年第2期21-25,共5页
Bulletin of Soil and Water Conservation
基金
国家重点基础研究发展计划(973)项目"典型地区农田地力定向培育理论与技术对策"子课题"典型红壤区农田地力定向培育与提升技术研究"(2011CB100506)
关键词
旱地红壤
水力学特性
饱和导水率
水分特征曲线
影响因素
red soil
hydraulic characteristics
saturated hydraulic conductivity
moisture characteristic curves
impact factors
