【摘要】 甘肃省酒泉市边湾农场土壤盐碱化严重,致使农业生产无法进行,因此采用脱硫石膏对采自边湾农场耕作层的土样进行改良试验,以评估其对边湾农场盐碱土改良的可行性。结果表明,与对照相比,施用脱硫石膏处理组(11 250～45 000 kg/hm~2)的土壤pH、碱化度、总碱度和钠吸附比均显著降低,分别下降了11.38%～12.61%、20.07%～48.40%、4.81%～8.35%、5.5%～22.92%;土壤中Na+、Cl-、K+和Mg2+含量分别降低了16.78%～29.33%、25.44%～46.77%、4.93%～10.05%、6.61%～17.72%,土壤中Ca2+和SO42-含量分别增加了12.91%～43.46%、5.77%～40.77%,表明试验土样的盐碱化程度降低。可见,试验方案对改良边湾农场盐碱化土壤有较好的效果,综合考虑,脱硫石膏施用量为33 750 kg/hm~2时改良效果最优。更多还原

【Abstract】 The salinization degree of soil in Bianwan farm, Jiuquan city, Gansu province, is so seriously that makes the agricultural production impossible. Therefore, the desulfuration gypsum was adopted to improve the soil samples from the tilling layer of Bianwan farm in order to evaluate its feasibility for improvement of saline-alkali soil. The results showed that, compared with the control group, the pH value, the degree of soil alkalization, total alkalinity and sodium adsorption ratio of the desulfurization gypsum treatment groups(11 250 ～45 000 kg/hm~2) were significantly decreased, fell by 11.38% to 12.61%,20.07% to 48.40%, 4.81% to 8.35%,and 8.35% to 22.92%, respectively; the content of Na+,Cl-,K+and Mg2+decreased by16.78% to 29.33%, 25.44% to 46.77%, 4.93% to 10.05%, and 6.61% to 17.72%, respectively, and that of Ca2+and SO42-increased by 12.91% to 43.46%, 5.77% to 40.77%. Thus, these phenomenons indicated an obvious decrease in salinity of the tested soil samples. So, the test scheme was good for the improvement of saline soil from Bianwan farm, and the optimal amount of desulfurization gypsum was 33 750 kg/hm~2.更多还原