燃煤电厂脱硫石膏改良碱化土壤的施用量

Application Amount of Desulfurized Gypsum from Coal Fired Power Plants on Improving the Quality of Alkalized Soil

利用燃煤电厂脱硫石膏改良盐碱地对于确保国家粮食安全和生态安全、发展循环经济具有重要意义.选择具有典型代表性的宁夏西大滩碱化土壤,以降低土壤碱化度和总碱度为目标,采用盆栽试验和土柱模拟试验,确定了改良不同程度碱化土壤脱硫石膏的理论施用量:轻度碱化土壤为12 529.5 kg/hm2,中度碱化土壤为17 256.0 kg/hm2,重度碱化土壤为23 563.5kg/hm2.在脱硫石膏改良的碱化土壤上种植油葵的田间试验表明,由盆栽试验和土柱模拟试验得出的脱硫石膏施用量可以作为大田示范推广的参考值.

In order to protect national grain safety and ecological safety and develop a sustainable economy, it is important to improve alkaline land with desulfurized gypsum from coal fired power plants. Representative lightly alkalized soil, medium-alkalized soil and seriously alkalized soil in Xidatan of Ningxia Province were selected in the research and used in pot and soil column simulation experiments. The goal was to determine the theoretical application amount of desulfurized gypsum to improve alkalized soil of different alkalized degrees, in order to decrease the alkalization degree and total alkali degree of the soil. It was found that the theoretical application amounts of desulfurized gypsum for lightly alkalized soil, medium-alkalized soil and seriously alkalized soil were 12,529.5, 17,256. 0 and 23,563.5 kg/hm2, respectively. A field experiment using the improved alkalized soil by desulfurized gypsum to plant oil sunflower seeds verified the application amount of desulfurized gypsum. The conclusions indicate that the application amount of desulfurized gypsum determined by the pot experiment and soil column simulation experiment can be used as the reference for large field demonstration and popularization.