磷石膏改善苏打碱土理化性质效果分析

Efficiency of Phosphogypsum on Reclaiming Sodic Soils of Songnen Plain

分析了磷石膏对苏打碱土团聚体稳定性、饱和导水率和盐分淋洗效果的影响。结果表明:水稳定大团聚体质量分数和饱和导水率均随磷石膏施用量的逐渐增加而不断提高,磷石膏施用量达到100%GR时,水稳性大团聚体质量分数从对照的0.03%增加到33.31%,饱和导水率从对照的0.13mm·d–1提高到3.14mm·d–1;出流液电导率和pH均随磷石膏施用量的增加而降低,磷石膏施用量达到100%GR时,出流液电导率和pH分别从对照的8.85mS·cm–1和10.26降低到3.46mS·cm–1和9.83。因此,磷石膏对苏打碱土理化性质的改良效果十分显著。

Effects of phosphogypsum on water stable aggregates, saturated hydraulic conductivity and salts leaching of sodic soil were studied. The results showed that water stable macro-aggregates percentage and saturated hydraulic conductivity of sodic soils increased with the increment of phosphogypsum application. The water stable macro-aggregates percentage increased from 0.33% in the control to 33.31% in the treatment of phosphogypsum of 100%GR, and saturated hydraulic conductivity increased from 0.13 mm·d^–1 in the control to 3.14 mm·d^-1 in the treatment of phosphogypsum of 100%GR. Electrical conductivity （EC） and pH of leachates decreased with the increase of phosphogypsum application. EC of leachates decreased from 8.58 mS·cm^-1 in the control to 3.46 mS·cm^-1 in the treatment of phosphogypsum of 100%GR, and pH decreased from 10.26 to 9.83. Therefore, phosphogypsum is effective for improvement of poor physical and chemical properties of sodic soils.