PAM对沙质土壤持水性能影响的模拟研究  

A Simulated Study of the Effect of PAM on Water Holding Capacity of Sandy Soils

作　　者：李佳佳[1] 李俊颖[1] 王定勇[1,2] 

机构地区：[1]西南大学三峡库区生态环境教育部重点实验室,资源环境学院,重庆400716 [2]重庆市农业资源与环境研究重点实验室,重庆400716

出　　处：《西南大学学报（自然科学版）》2010年第3期93-97,共5页Journal of Southwest University(Natural Science Edition)

基　　金：国家科技支撑计划课题(项目编号:2007BAD39B02);西南大学生态学重点学科“211工程”建设项目

摘　　要：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1000mg／kg6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200mg／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200mg／kg．In a simulated experiment, sandy yellow soil was supplemented with polyacrylamide （PAM） at 0, 50, 100, 200, 400 and 1000mg/kg to evaluate its effect on water-holding capacity of the soil. The results indicated that PAM restrained the evaporation of soil moisture. Compared with the control treatment （CK）, PAM treatments decreased the evaporation capacity of soil moisture by 4.12%-14.46% and increased the average water contents of the soil by 1.40%-5.64%, field capacity by 20. 68%-33.71%, capillary capacity by 18.41%-29.04% and maximum water-holding capacity by 18.62 %-29.70%. Analysis of variance showed that significant differences existed among the treatments, indicating that the effect of PAM application varied with its rate. Under the conditions of the experiment, the treatment of 200 mg/ kg PAM gave the best result of restraining soil moisture evaporation.

关 键 词：聚丙烯酰胺(PAM) 冷沙黄泥 土壤持水性能 抗蒸发 

分 类 号：S156.2[农业科学—土壤学]