脱硫副产物在碱化土壤改良中的应用

Application of By-Product from Flue Gas Desulfurization in Reclamation of Sodic Soils

通过分析在不同脱硫副产物施用量下土壤理化性质的变化规律,对脱硫副产物改良碱化土壤进行理论研究,探寻改良碱化土壤的优化利用模式.采用宁夏银川和内蒙古鄂尔多斯的四种土样,每种土样分别加入4个水平(施用量分别为土样质量的0.5%、1.0%1、.5%2、.0%)的脱硫副产物,观察改良效果.结果表明:脱硫副产物能降低土壤pH和碱化度,改善土壤理化性质,从而达到改良碱化土壤的作用;碱化土壤的改良效果在一定的范围内(0～2.0%)与脱硫副产物的用量呈正相关,超过这一范围,不但不能提高改良效果,而且还会有大量的盐分累积,增加改良的难度;脱硫副产物改良碱化土壤的最佳用量范围为0.5%～1.0%.

The change of soil physical and chemical properties with different amount of by-product from flue gas desulfurization （FGD） applied was researched. The effect of sodic soils reclamation was investigated using by-product from FGD and searched for the optimal quantity of soil amendment due to the improvement of sodic soils. The effect of soil reclamation was observed by using four soil samples from Yinchuan of Ningxia and Ordos of Inner Mongolia at four levels （i.e.the amount of by-product from FGD is 0.5%, 1.0%, 1.5% and 2.0%）. As a result,soil pH and ESP decreased and this result indicates that byproduct from FGD has the effect of improving sodic soil physical and chemical properties. In the certain range of 0-2.0%, the amelioration effect of sodic soil presents positive correlation with the applied amount of by-product from FGD. If the amount exceeds the range ,the better effect of the soil reclamation could not be attained and a great deal of salt will be accumulated in soil and it will be more difficult to improve the sodic soil. In terms of this experiment result,the optimum range of applied amount is 0.5%-1.0%.