2种高分子保水材料对土壤持水能力的影响

Effects of two super absorbent polymers on water retention capacity of soil

采用离心机法，研究聚丙烯酸钠与聚丙烯酰胺2种高分子化合物在5种使用浓度（占干土质量0、0．01％、0．08％、0．2％与1％）的条件下对3种土壤（砂土、壤土、黏土）持水能力的影响。结果表明：3种土壤在0．01—1．5MPa水吸力时，持水能力随着2种高分子材料用量的增加而增加，砂土的作用效果较壤土、黏土更显著；2种高分子材料与土壤质量比控制在8／10000～2／1000范围内其作用效果较好，该用量条件下高分子吸持水分平均可释放83．7％供植物吸收利用。2种高分子材料对土壤持水能力的作用效果基本相同。

The effects of two super absorbent polymers, Sodium Polyacrylate （SP） and Polyacrylamide （PAM） , on water retention capacity of sand, loam, and clay were evaluated by using centrifugal method. Five concentrations of these polymers, 0, 0.01%, 0.08% ,0.2%, and 1% （on dry weight basis）, were added to these three soils. The results show that the amount of water retained by the soil at each suction over the range of 0.01 MPa to 1.5 MPa significantly increased with the increasing of the two polymers; The effects on sand were more obviously than loam and clay; The concentration of the two polymers were better controlled from 0.08 % to 0.20% by weight, then the crop would use 83.7% of the water kept by the polymer; The effects of the two polymers on the soil water retention were nearly the same.