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通过试验模拟,研究了不同剂量聚丙烯酰胺(PAM)施入沙质土壤后对土壤持水性能的影响.PAM设置0(对照),50,100,200,400和1 000 mg/kg 6个水平.实验结果表明,与对照相比,经PAM处理后的土壤累积蒸发量减小了4.12%~14.46%;平均含水量增加了1.40%~5.64%;田间持水量增加20.68%~33.71%,毛细管持水量增加18.41%~29.04%,最大持水量增加18.62%~29.70%;方差分析在5%水平上各处理间存在显著差异,最大差异出现在PAM施加量为200 mg/kg时.表明了PAM能够改善土壤的持水性能,其改良效果因PAM施入浓度而异.在改良该沙壤土保水性时,其适宜PAM施用量为200 mg/kg.
The effects of different doses of polyacrylamide (PAM) on soil water holding capacity were studied by means of experimental simulation.PAM was set at 6 levels of 0, 50, 100, 200, 400 and 1 000 mg / kg.The experimental results showed that, Compared with the control, the accumulated soil evaporation after PAM treatment decreased by 4.12% ~ 14.46%, the average water content increased by 1.40% ~ 5.64%, the field water capacity increased by 20.68% ~ 33.71%, the capillary water holding capacity increased by 18.41% ~ 29.04%, and the maximum water content increased by 18.62% ~ 29.70% .Analysis of variance showed significant difference at 5% level, the biggest difference appeared when PAM application was 200 mg / kg, which showed that PAM could improve soil Water performance, the improvement effect due to the concentration of PAM applied varies in improving the water retention capacity of sandy loam, its suitable PAM dosage is 200 mg / kg.