The invention provides a
saline soil improvement
system and method for constructing a vertical flow channel and performing fractional-frequency leaching, the
system comprises a
physical barrier breaking layer, the vertical flow channel, a fractional-frequency leaching
water supply system and an
earth surface evaporation-inhibiting salt-controlling layer, specifically, a target
land parcel to be improved is deeply ploughed to form the
physical barrier breaking layer, then drilling is performed to form the vertical flow channel, and the
physical barrier breaking layer is formed by the vertical flow channel and the fractional-frequency leaching
water supply system. A vertical dominant flow
channel network penetrating through the water
blocking layer is constructed,
irrigation and leaching are conducted at least three times with the decreasing water amount by means of the
irrigation water frequency, after
irrigation and leaching are completed, a
plastic film is covered to form a ground surface
evaporation restraining and salt controlling layer, water
evaporation and salt return are restrained, and improvement is completed. According to the method, a vertical flow channel is constructed, a rapid channel for salt to flow downwards is physically opened, the problem of upper blocking and lower flooding caused by a water
blocking layer is fundamentally solved, the salt discharging efficiency is high,
water resources are saved by adopting a frequency division leaching mode, the salt return phenomenon is effectively inhibited by matching with
plastic film covering after leaching, and the improvement achievement is consolidated.