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施用农用稀土对潮土磷吸附特性的影响

Keywords: 稀土元素,潮土,有效态磷,磷吸附

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Abstract:

采用室内向土样喷施稀土溶液的方法,研究了施用农用稀土对潮土P吸附特性的影响。结果表明,农用稀土施加后土壤P等温吸附特性可较好地利用Langmuir吸附方程拟合,获取稀土施加后土壤最大P吸附量、吸附反应常数和最大缓冲容量。随稀土施用量的增加,土壤最大P吸附量降低而吸附反应常数和最大缓冲容量增加;当施用量增至100mg·kg-1风干土时,与对照相比差异均达显著水平。在稀土施用量低于10mg·kg-1风干土时,土壤有效P含量和最大P吸附量呈线性负相关,但在剂量增至100mg·kg-1时未见明显的关联。因此,高剂量稀土施加不仅影响土壤P的吸附性能,而且可能会影响土壤P形态转化来改变P的生物有效性。

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