关键词：
海涂围垦区;盐碱土;生物炭;聚丙烯酰胺(PAM);土壤水力性质
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.
译 名：
Effects of biochar and PAM application on saline soil hydraulic properties of coastal reclamation region
作 者：
CAO Yu-tong;SHE Dong-li;Ministry of Education Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China,Hohai University;College of Water Conservancy and Hydropower Engineering,Hohai University;
单 位：
Ministry of Education Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China,Hohai University%College of Water Conservancy and Hydropower Engineering,Hohai University
关键词：
coastal reclamation region;;saline soil;;biochar;;polyacrylamide;;soil hydraulic properties
摘 要：
Disc infiltration tests were carried out to study the soil infiltration characteristics under different rates of soil amendments application,and to investigate the effects of biochar and polyacrylamide( PAM) application on saline soil hydraulic properties,pore characteristics and contribution of each pore to soil water flow in coastal reclamation region. The results showed that soil satura-ted hydraulic conductivity increased by 46.4% when biochar was applied at 2% compared with the control,and decreased with increasing PAM application. The total effective soil porosity and r>100 μm pores were increased by 8.3% and 10.2%( P<0.05) with the application of 2% biochar alone. The total effective soil porosity and different radius pores decreased with the PAM application. Particularly,the total effective soil porosity decreased markedly when PAM was applied at 1‰and the reduction was up to 88%. With the application of biochar and PAM,the contribution of r<100 μm pores to water flow decreased and the pores with r>500 μm played a major role in determining water flows.
