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通过圆盘入渗试验,探讨不同改良剂施用量下土壤入渗特性的变化,揭示添加生物炭和聚丙烯酰胺(PAM)对海涂围垦区盐碱土水力学参数、孔隙特征及不同级别孔隙水流贡献率的影响.结果表明:单施2%生物炭,土壤饱和导水率比对照增加46.4%;盐碱土饱和导水率随PAM施用量增加而减小.单施2%生物炭使土壤总有效孔隙度和半径>100μm的有效孔隙度分别增加8.3%和10.2%.单施PAM时,土壤总有效孔隙度和不同半径孔隙有效孔隙度均有减小趋势,其中,PAM梯度为1‰时最明显,减幅高达88%以上.施用生物炭和PAM后,半径<100μm的孔隙的水流贡献率呈下滑趋势,半径>500μm的孔隙对土壤水流运动起主导作用.
Through the disc infiltration test, the infiltration characteristics of soil under different amendments were explored, and the effects of biochar and polyacrylamide (PAM) on the hydraulic parameters, pore characteristics and pore-water flux of saline-alkali soil in the reclamation area were analyzed. The results showed that the saturated hydraulic conductivity of soil increased 46.4% compared with the control when applied with 2% biochar, and the saturated hydraulic conductivity of saline-alkali soil decreased with the increase of PAM dosage. Porosity and the effective porosity with the radius> 100μm increased by 8.3% and 10.2%, respectively.Under the application of PAM, the total effective porosity of soil and the effective porosity of different diameters all decreased, in which, when the gradient of PAM was 1 ‰ Significantly decreased by more than 88% .After biochar and PAM were applied, the water flow contribution rate of pores with radius <100μm showed a downward trend, and the pores with radius> 500μm played a leading role in soil water flow movement.