Research on Soil Dynamic Constants of Sandy Land
Peixi Su · 2000
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.