施用生物炭和聚丙烯酰胺对海涂围垦区盐碱土水力性质的影响

发布时间：2018-05-19 14:52

  本文选题：海涂围垦区 + 盐碱土　； 参考：《应用生态学报》2017年11期

【摘要】：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.
[Abstract]:Through disc infiltration test, the changes of soil infiltration characteristics under different modifiers were discussed, and the hydraulic parameters of saline-alkali soil added with biochar and polyacrylamide (PAM) were revealed. The effect of pore characteristics and the contribution rate of pore flow at different levels. The results showed that the saturated hydraulic conductivity of soil increased by 46.4% with the application of 2% biochar alone, and the saturated water conductivity of saline-alkali soil decreased with the application of PAM. The total effective porosity of soil and the effective porosity of 100 渭 m radius were increased by 8.3% and 10.2% respectively by applying 2% biochar alone. The total effective porosity of soil and the effective porosity of different radii decreased with the application of PAM alone, and the gradient of PAM was more than 88% when the gradient of PAM was 1 鈥，

本文编号：1910528