沙质土壤水分运动参数研究

利用土壤水动力学原理,在室内测定了沙质土壤水分特征曲线、饱和导水率和非饱和导水率。在沙地葡萄园,建立观测场,埋设中子管和负压计,观测水分和吸力变化,基质吸力随土层加深而减小,10 cm处全年最大为126 cm水柱(12.4k Pa),30 cm处全年最大为116 cm水柱(11.4k Pa)。4月份吸力最大,土壤最干燥,7月份吸力最小,土壤最湿润。

Research on Soil Dynamic Constants of Sandy Land

By soil water dynamics principle there were determined soil water movement parameters on sandy land vineyard in laboratory, namely water characteristic curve, saturated water conductivity and unsaturated water conductivity, and the saturated water conductivity is 0\^12 cm\5min\ \{-1\}. In vineyard on sandy land there was built observation space. For monitoring water dynamics and water potential changes, neutron tube and pressure gauge were embedded at observation space, the groundwater value and monthly change curves of soil water potential were obtained. The potential of substrate was down increasing, namely substrate suction was down reducing. The annual maximum substrate suction was 126 cm head of water(12\^4 kPa)at the depth of 10 cm and 116 cm head of water(11\^4 kPa) at 30 cm. In April suction reaches annual maximum and soil is most dry. In July suction reaches minimum and soil is most moist.