Study On Soil Improvement Of Saline-alkaliSoil In Isolated Layer And Landfill

Based on the characteristics of saline soil in the upper and middle reaches of the Yellow River,including the deep groundwater depth,strong evaporation,low precipitation,soil physical and chemical properties,poor nutrient barren and so on,To provide effective technical solutions for local vegetation restoration.Daejeon test was completed in Ningxia Qingtong Xia.In this study,the effects of different isolation layers(straw,gravel,film)and landfill materials(desulphurized gypsum,furfural residue and biological fertilizer)on the improvement of saline soil in the upper and middle reaches of the Yellow River were analyzed.The main conclusions are as follows:1 The soil moisture content in the study area increased with the depth of the soil.The soil moisture content of the surface soil is the lowest,followed by 20-40cm and 40-60cm layer soil,60-80cm soil moisture content is the highest.Different salt layer and landfill material can effectively improve the 0-20cm soil moisture content2 The EC value of the soil in the study area in autumn is higher than that in summer.The effect of different treatments was significant,and the effect of 0-20cm soil was the best.Straw salt treatment is the best.The surface area of the control area has the highest EC,and the different treatment zones and landfill zones are opposite.3 The soil pH value in the study area was above 8,which was changed by different seasons and depths.The top soil pH is the highest.As the depth increases,the pH decreases.Different treatments can reduce the soil pH and the difference is significant,the best effect is 0-20cm soil improvement.Straw salt treatment is the best.4 The soil SAR in the study area is different due to the different seasons and different soil depths.The SAR of the study area is more than 50 in summer and 30 in autumn.Different soil layer and landfill material can effectively reduce the soil SAR,reduce the 0-20cm soil SAR the most obvious.There were significant differences among different treatments,and the effect of straw salt treatment was the best,and the surface soil SAR was 15.72 in summer and 20.91 in autumn.5.The order of soil salt content in the study area was Na+>SO42+>Ca2+>Mg2+>K+.The soil of the study area belongs to the sodium chloride base.With the increasing of soil depth,Ca2+ ions,Mg2+ions.K+ion content gradually decreased,Na+,ion SO42-ion is the opposite.0-20cm soil improvement effect is the best.The effect of the film is the best in the treatment of salt.The effect of desulphurization gypsum treatment in landfill material treatment is the best.