聚丙烯酸钠的释水特征及对土壤物理参数的影响

发布时间：2018-04-16 07:52

本文选题：聚丙烯酸钠 + 土壤导水率　；参考：《干旱地区农业研究》2017年02期

【摘要】：聚丙烯酸钠作为保水剂的一种,在农业应用中能够防止水土流失,改善土壤水分状况,促进作物增产,提高作物品质。通过室内试验分析了聚丙烯酸钠的释水特征及土壤中混施不同比例(0、0.3%、0.5%、1%和1.5%)聚丙烯酸钠对土壤饱和导水率、收缩比和紧实度的影响。研究结果表明,聚丙烯酸钠释水与混施土壤后释水存在较大差异,100%聚丙烯酸钠在1.5 MPa吸力条件下能保持46.4%的水分,而在干土中可以快速100%的释放水分;随着土壤聚丙烯酸钠用量的增加,土壤透水性急剧降低,均匀混施达到1%时,饱和导水率接近0 m·d~(-1);干燥后土壤紧实度和收缩比增加,导致聚丙烯酸钠的农业应用也存在一定的潜在风险。
[Abstract]:As a water-retaining agent, sodium polyacrylate can prevent soil erosion, improve soil moisture status, increase crop yield and improve crop quality in agricultural application.The characteristics of water release of sodium polyacrylate and the effects of mixed application of 0. 3% and 0. 3% of sodium polyacrylate on saturated water conductivity, shrinkage ratio and compactness of soil were analyzed in laboratory.The results showed that there was a great difference between sodium polyacrylate release and mixed application of soil water release. 100% sodium polyacrylate could keep 46.4% water under the condition of 1.5 MPa suction, but it could release 100% water quickly in dry soil.With the increase of the amount of sodium polyacrylate, the water permeability of the soil decreased sharply, and the saturated water conductivity was close to 0 mg / d ~ (-1) when mixed evenly, and the compactness and shrinkage ratio of the soil increased after drying.The agricultural application of sodium polyacrylate also has some potential risks.
【作者单位】：中国农业科学院农业环境与可持续发展研究所;中国科学院地理科学与资源研究所;
【基金】：农业部公益性行业专项(201503116) 国家自然科学基金课题(51309211) 863课题(2011AA100503)
【分类号】：S152;S482.99

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