不同保水剂对土壤物理性质影响的探究

Effect of Different Super Absorbent Polymer on Soil Physical Properties

保水剂的研究多集中于保水性和持水性,关于保水剂对土壤物理性质影响的研究还不多见,因此,选取市场上的MP3005KCE、沃特和HG-60等3种保水剂,对沙土、壤土和黏土作用能力进行分析。结果表明:1增加3种土壤的水稳性团聚体的比例,增加幅度为HG-60>沃特>MP3005KCE,其中MP3005KCE对改善沙土和壤土的通气性能较其他两种保水剂明显;2膨胀率均明显增加(p<0.05),HG-60>沃特>MP3005KCE;从膨胀均匀程度来看沙土中MP3005KCE>沃特>HG-60,壤土中沃特>MP3005KCE>HG-60,而黏土中都不均匀;3土壤密度均显著降低(p<0.05)且土壤孔隙度均明显增加(p<0.05),HG-60>沃特>MP3005KCE;随着保水剂施加的不断增加,土壤密度逐渐降低,土壤孔隙度逐渐增加;当保水剂的浓度超过0.5%后对土壤密度和孔隙度改善的效果并不明显增加(p>0.05)。为保水剂在干旱区的应用提供重要参考价值。

The researches on Super Absorbent Polymers （SAP） mainly focus on water retention properties and water holding capaci ty. Few studies focus on the effects of Super Absorbent Polymers （SAP） on soil physical properties. Therefore, this study selects three Super Absorbent Polymer （SAP）, including MP3005 KCE,WT and HG-60, to analyze their effects on sand, loam and clay. The results show that： ①the water-stable aggregates of the three kinds of soil are increased, the order of increasing amplitude from big to small is HG-60, WT, MP3005 KCE,and the MP3005 KCE improves the ventilation performance of sand and loam more sig nificantly than the other two Super Absorbent Polymers （SAP）;② the expansion rate is significantly enhanced （p〈0. 05）,with the order from big to small as HG-60, Walter, MP3005 KCE; from the aspect of expansion uniformity, the order from big to small in sand is MP3005 KCE, WT, HG-60,while in loam is WT, MP3005 KCE,HG-60, and the expansion of clay are not uniform;③ soil bulk density is significantly reduced （p〈0.05） and soil porosity is significantly increased （p〈0. 05）, with the order from big to small as HG-60, Walter, MP3005 KCE; with the increase of applied concentration of Super absorbent polymers, the soil bulk density gradually decreases and the soil porosity gradually increases;when the super absorbent polymer concentration is above 0.5 %, the improvement effect of soil bulk density and porosity is not significantly （p〈0.05）. The study result can provide an important reference value for the process of super absorbent polymers applied in arid areas.