高吸水性树脂对沙质土壤物理性质和玉米生长的影响

Influence of Superabsorbent Polymers on Sandy Soil Physical Properties and Corn Growth

对4种典型的不同质量分数的高吸水树脂进行试验,用以研究其对鄂尔多斯沙质土壤的物理性质和玉米生长的影响。结果表明,高吸水树脂能够明显改善土壤水分特性,并且当高吸水性树脂质量分数在0.50%～1.00%时效果最佳;高吸水树脂有效地改善了土壤的持水能力,且在土壤水吸力小于0.8 MPa的土壤中的改善作用明显优于土壤水吸力大于0.8 MPa的土壤;在鄂尔多斯沙质土壤的有效水方面,聚丙烯酸酯聚合物在质量分数低于0.50%时优于聚丙烯酰胺聚合物,但当质量分数高于0.50%时结论则相反;土壤容重随着高吸水树脂质量分数的增大而降低,土壤总孔隙度随着高吸水树脂质量分数的增大而增大。高吸水树脂质量分数越大玉米存活的时间也越长。

Four typical superabsorbent polymers were tested to study their impact on the physical properties of sandy soil and the growth of corn.Results showed that superabsorbent polymers evidently ameliorated soil water characteristics.Concentration of SAP from 0.50% to 1.00% had a typical significance to Ordos sandy soil.Superabsorbent polymers effectively improved the water holding capacity of soil,and the ameliorating effect in low soil water suctions（0.8 MPa） obviously superior to the high soil water suctions（0.8 MPa）.In terms of soil available water of Ordos sandy soil,polymers of polyacrylate had better performance than polymers of polyacrylamide in lower SAP concentrations（0.5%）,while in the higher SAP concentrations（0.5%） is the opposite.Soil bulk densities were decreased with the increase of concentration of superabsorbent polymers.Soil total porosities were increased with the increase of concentration of superabsorbent polymers.The survival time of maize was longer when the amounts of superabsorbent polymer were higher.