【摘要】 通过现场试验与室内测定分析,对可溶性植物营养成分SO42-、NO3-、Ca2+及K+在冻结融化过程中的运移过程进行了研究。结果表明,冻结初期土壤中含有离子浓度越大,融化末期其降低幅度也越大。同时高浓度陪补离子NO3-和Ca2+促使SO42-淋失,高浓度陪补离子SO42-促进土壤Ca2+的吸附使Ca2+增加。而Ca2+的存在并未使土壤的固钾能力因冻结初期K+浓度的增加而增强。更多还原

【Abstract】 Today,with continuously increasing of using fertilizer,study on transport rules of plant-nutrition elements in tilled soil during freezing and thawing period is more and more important,whether in frozen soil field or in water and soil environmental protection and the controlling aspect of soil secondary salinization.The author developed field test and the indoor determination for this point.It reveals the transport rules of SO2-4、NO-3、Ca2+ and K+ during freezing and thawing period.The results show that the higher ion concentration during freezing initial period,the higher lowered range of it during melting end period.And high-concentration of simultaneous existence NO-3 and Ca2+,makes concentration of SO2-4 lower.High-concentration of simultaneous existence SO2-4,promotes concentration of Ca2+ to increase.The existence of Ca2+couldn’t increase the K fixation capacity,even though concentration of K+ is big during freezing initial period.更多还原