冻融作用对酸化土壤中NH_4^+吸附特性的影响研究  

Effects of Freeze-Thaw Action on Ammonium Absorption Characteristic in Acidified Soils

作　　者：彭丽欣[1] 刘嘉[1] 马卉[1] 王金鹤[1] 王玉军[1] 

机构地区：[1]吉林农业大学资源与环境学院,吉林长春130118

出　　处：《环境科学与管理》2014年第4期72-75,共4页Environmental Science and Management

基　　金：吉林省重大科技攻关专项(20130204054SF);吉林省科技发展计划项目(20110402)

摘　　要：以吉林农业大学长期定位试验田土壤为研究对象,采用室内模拟冻融环境和振荡平衡的方法,探讨冻融作用对NH+4在酸化土壤中吸附特性的影响。结果表明,随着冻融周期的增加,酸化土壤对NH+4的吸附量逐渐减小;冻结时间对酸化土壤吸附NH+4的影响不明显;随着冻前含水量的增加,酸化土壤对NH+4的吸附量逐渐减小,对NH+4的吸附量由大到小排列为:15%>25%>35%。酸化土壤对NH+4的吸附过程能很好地利用Langmuir方程拟合,冻融作用促进酸化土壤中NH+4的释放,增加了NH+4流失风险。This study aimed to investigate the effects of freeze -thaw cycles, freeze times and moisture content before -freez- ing on ammonium absorption characteristics in acidified soils by oscillation equilibrium experiment, which was collected and sub- jected to laboratory tests in the Jilin Agricultural University Experimental Station with long - time positioning. Results showed that the ammonium adsorption capacity reduced with the increasing of freeze - thaw cycles ; it had no significant changes under the dif- ferent freeze times ; it reduced with the increasing of moisture content before - freezing, the adsorption capacity of ammonium in different moisture before -freezing treatments soil were arranged by descending order as follows： 15% 〉 25% 〉 35%. Langmuir isotherms was fitted to the adsorbed ammonium in the solution using regression procedure, it gave good fits of the measured data. Freeze - thaw process promoted the release of acidified soil ammonium and increased soil ammonium loss risk.

关 键 词：NH4^+ 酸化土壤 冻融作用 吸附 

分 类 号：X53[环境科学与工程—环境工程]