秸秆改良材料对冷沙黄泥土壤钾素吸附解吸的影响

Effects of Straw Modified Materials on Potassium Adsorption and Desorption in Sandy Yellow Soil

为了研究秸秆改良材料对沙质土壤钾素的调控作用,采用土培试验,研究作物秸秆、膨润土和聚丙烯酰胺(PAM)配制的秸秆改良材料,对冷沙黄泥土壤钾素吸附、解吸的影响。结果表明,秸秆改良材料能够显著提高沙质土壤对钾的吸附性能,增强固钾能力,随秸秆改良材料中PAM用量的增大,钾吸附量增加,不同土培时期,相比F0(900:100:0),F3(900:100:30)处理土壤钾素总平均吸附量达最大,10、30、60、90天的F3(900:100:30)处理土壤钾素总平均吸附量分别增加6.1%、9.2%、10.9%、13.9%。施用秸秆改良材料促使土壤钾素解吸量提高,但低于吸附量,随秸秆改良材料中PAM所占比例提高,土壤中钾解吸率显著提高,与F0相比,10、30、60、90天的F3处理使土壤中钾解吸率分别提高6.1%、18.2%、17.2%、15.4%。秸秆改良材料能提高沙质土壤固钾能力,是适合修复沙质土壤的改良材料。

In order to evaluate the regulative ability of modified materials on the adsorption and desorption of potassium in sandy soil,the effect of straw modified materials which were made of straw,bentonite and PAM,on the adsorption and desorption of potassium in sandy yellow soil was carried out.The results showed that the straw modified material significantly improved the adsorption property to potassium in the sandy soil,and enhanced the fixed ability to potassium of soil.With the adding amount of PAM increasing,the adsorption amount of potassium raised.Compared to treatment F0,during 10 days,30 days,60 days and 90 days,the average adsorption of F3 treatment reached the highest degree,which increased by 6.1%,9.2%,10.9% and 13.9%.Straw modified material promoted potassium to lose from soil,but the desorption still was lower than adsorption.While the proportion of PAM in straw modified material increased,the desorption rate of potassium also was improved significantly.Compared to F0,F3 treatment in 10 days,30 day,60 days and 90 days experiments,potassium desorption rate increased by 6.1%,18.2%,17.2% and 15.4%.Straw modified materials could improve the capacity to potassium of soil,which could be applied in restoration of degraded soil.