Study On Sand Column And Movement Of Water And Soil Salt In PCE Patent Technique On Saline

Saline land,one of the most important reserve land resources,has significant development value potentially. It has practical significance to develop and utilize of saline land resources positively,by the contradiction between people and land is becoming prominent increasingly. The experiment,which used coastal saline soil and Caofeidian Chuitian soil as the research objects,is based on patented technology PCE. The researchs try to find out the desalinization and the transportation law of water and salt,comparing with soil column leaching of two types saline soil. The results are as follows:1. What I've found is that PCE Technology could accelerate the rate of salt loss, increase inhibition of pH and accelerate the rate of water infiltration during the test of Dagang District Tianjin Municipalities soil column leaching experiment.Quantity of salt washed in PCE soil column experiment was 1.4 times as much as the one in the control soil column group with no sand column, while water infiltration rate is 1.4 times. Duality of function, useing salt content(y),pH(x1) and water seepage rate(x2) as variables,fitting linear regression equation is:y=25.693-2.970x1-0.125x2(R2=0.631)2. Two different types of soil column experiment researched the relationship between volume of leaching water and salt wash quantity under three different intensity of watering. As the total volume of leaching water is 24L, it had the best effect to set the volume of water spray intensity as 4L each time. Seting soil column in the sand column test can improve the effect of washing salt. the performance of washing salt in coastal saline soil column with sandcolumn test is more obvious than the one in Caofeidian Cuitian soil. The desalinization in Coastal saline soil experiment with sand column was 1.166 times as much as the one in the control soil column group with no sand column,while the desalinization in soil column with sand column experiment is 1.045 times.This is due to the different texture of soil.3. What indicated during soil column experiment was that quantity of salt in the upper layer soil increased; meanwhile,the one in the upper layer soil declined.Setting sand column in soil column experiment accelerated the disappearance of the underlying situation of salt accumulation.The rate of desalinization was the fastest in upper layer soil, while low rate of desalinization in underlying soil.The effect of salt washed in Caofeidian Cuitian soil experiment was better than the one in saline soil.4. What the research on the law of salt transportation after washing salt showed is that soil conductivity is inversely proportional to soil moisture,in other words,soil salinity is inversely proportional to soil moisture. In the wake of irrigation,the migration of salt peak was faster than wetting peak. The irrigation of water took effect in the 0-60cm soil, with less influence on lower soil.Soil salinity declined in the upper middle soil, but accumulated in the lower soil during the irrigation of water.5. According to wash salt leaching test results,the optimal effect of the salt leaching was useing by 60L per unit area, total 360L water to wash salt leaching.Leaching of water per unit area was adjusted according to the evaporation of the field and the difference of soil texture.If the amount of salt leaching used a unified standard,the amount of water washing in Caofeidian Cuitian soil experiment was saved nearly 20% of the water comparing with saline soil experiment.