脱硫副产物对改良碱化土壤的理化性质与作物生长的影响

Effect on Physical and Chemical Properties of Soil and Sunflower Growth when Sodic Soils Reclaimed with By-product from Flue Gas Desulphurization

由于脱硫副产物的主要成分为CaSO4,因此可以用来改良碱化土壤。通过盆栽试验研究了脱硫副产物对碱化土壤的改良效果,试验设8个处理,4个脱硫副产物水平(0,7 5,15,22 5t/hm2)和2个淋洗水平(750,1200m3/hm2)。研究表明:施加脱硫副产物增加了葵花的出苗率,降低了碱化土壤的碱化度(ESP)、pH、全盐量(TDS)和Na++K+/Ca2++Mg2+,但过量施加脱硫副产物也会抑制作物的出苗和生长;淋洗可以提高脱硫副产物的改良效率。根据试验结果推测当ESP=63 5,pH=9 15时,获得最佳产量的脱硫副产物用量13 05t/hm2。脱硫副产物用量7 5t/hm2和淋洗水量1200m3/hm2的处理组合对碱化土壤改良效果最佳,葵花出苗率和单株产量分别达到了92 5%和36 40g。

Because main composition of by-product from flue gas desulphurization(BFGD)are CaSO_4, it can be used for improving sodic soils. A pot experiment was conducted to study the effect of BFGD on ameliorating sodic soil. There were eight treatments designed in this experiment, four BFGD levels(0,7.5, 15 and 22.5 t/hm^2)and two leaching levels(750 m^3/hm^2 and 80 m^3/hm^2). Results indicated that rate of sunflower emergence was increased, Exchangeable Sodium Percentage(ESP), pH, Total Dissolved Salts(TDS)and the ratio Na^++K^+/Ca^(2+)+Mg^(2+) in water soluble salt were decreased by applying the by-product, but excessive BFGD also had effect on emergence and growth of sunflower, and leaching can improve the improvement efficiency. It's was inferred that the best BFGD requirement was 13.05 t/hm^2 when ESP =63.5, and pH =9. 15 according to the test result. The result of treatment 4 (7.5 t/hm^2 BFGD and 1200 m^3/hm^2 leaching water)was best in this experiment, the emergence rate and single output of sunflower are up to 92.5% and 36.40 g respectively.