A Research Of Ground Cover On Salinity And Water In The Salinized Soil

The testing field was established at the farm of Linze Xiaoquanzi Desert Control Station (DCS) in the middle part of the Hexi- corridor. Using the cover measure to control formation forms accumulating on the ground surface, which is the one of the main factors of the soil salinization. The covering material are plastic film, wheat straw and sand. The spring thawing season and summer high temperature season on which salinity accumulating on the ground surface and water evaporating on are the most serious, were chosen. This thesis analysed the effect of three covering materials on the two seasons, and approached to the mechanism of coVer effect. The research shows: on the spring thawing season and summer high temperature season, covering ground surface on the salinized soil with plastic film, wheat straw and sand can control salinity accumulating effectively on the ground surface and reduce water evaporating on. And the research also shows that plastic film should cover all ground surface, the fitable quantity of wheat straw should be 2934.8kg/hm2 and the fitable thickness of sand cover should be 4.0cm. To the different salinity ions, the controled order of the different salinity ions are: CV>K +Na>Mg>>SO4> >HCO7>Ca2 To the three covering materials, in the spring thawing season, the effect of the cover all ground surface by plastic film is best, the second is sand cover of 4.0cm thickness. In the summer high temperature season, the effect of the all ground surface cover is best, the second best effect is wheat straw covering of 2934.8kg/hm2 quantity. The difference of covering effect in spring thawing season and summer high temperature season is due to the difference of soil temperature of the covering ground with sand or wheat straw. To the layer variation of soil salinity and water, the best covering effect is the surface ground, the second is 0.5-0cm layer, the 10-0cm and 30?0cm layers are less effect.