To explore the influence of drip irrigation frequency on the dynamic process of soil salinity under the influence of
brackish groundwater，different irrigation frequencies were treated under the same groundwater depth，and drip irrigation infiltration
test was conducted in the soil column.In these experiments，the groundwater salinity was 3 g/L，3 irrigational frequencies were set
with the same irrigation quantity of 2 L，the corresponding single drip irrigation quantity was 0.5，1 and 2 L，and the irrigation
intervals was 2，4 and 8 days，respectively；at the same time，with no groundwater conditions as a control.The results show that there
are two forms of supplementation of ground water to soil water，one is rising groundwater capillary water into the subsoil directly，
bringing the soil close to the saturation state; the other is that under the action of evaporation on the surface，the groundwater rises
to the surface to form a stable evaporation，increasing the moisture content by an average of 18.76 percentage points.Among them，
the lower frequency of drip irrigation (a large amount of dripping water)，the earlier phenomenon of stable evaporation in the soil.The
salt dynamic of the whole soil can be divided into two regions which are opposite in the direction of movement，namely，the upper
layer and the lower soil desalting area; Increasing the frequency of drip irrigation can only reduce the salt level of topsoil，and can
not inhibit the salt accumulation of the whole upper soil (0- 30 cm soil layer) (average salt deposition rate is 49.58%).However，the
soil (30 ~ 60 cm soil layer) in the lower saturated zone (30- 60 cm soil layer) desalination of soil (average desalting rate of 30.64%)
due to the dissolving effect of groundwater.Low frequency drip irrigation，because of its large amount of irrigation，has deep seepage
and can play the role of leaching salt in the upper soil
Liang Mengfan, Li Mingsi.
Influence of soil salinity migration pr ocess of drip ir rigation frequency
under shallow brackish gr oundwater. Journal of Shihezi University. 2018, 36(4): 422-430 https://doi.org/10.13880/j.cnki.65- 1174/n.2018.04.005
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