作　　者： ; ; ; ;

机构地区： 南京农业大学资源与环境科学学院

出　　处： 《环境科学》 2011年第5期1462-1470,共9页

摘　　要： 土壤理化性质是影响污染土壤植物修复效果和修复后土壤适耕性的重要因素.以菲为多环芳烃(PAHs)代表物,采用植物土培和室内分析试验探讨了菲污染土壤小麦/苜蓿套作修复过程中土壤理化性质的动态变化.结果表明,种植植物明显提高了菲污染土壤pH,最大升高幅度可达0.61;相同菲污染水平条件下,套作处理土壤pH与单作处理差异不显著.土壤有机质、全氮、碱解氮、全磷、速效磷、阳离子交换量和速效钾由于生物的分解作用和植物的吸收利用都随处理时间延长而下降.小麦/苜蓿套作加速了它们的消耗,降低幅度为5.24%～57.85%,较单作多消耗6.29%～39.09%,特别是促进了土壤碱解氮、速效磷的消耗,最高可达57.85%.因此,小麦/苜蓿套作修复菲污染土壤时,应注意氮、磷肥的施用. Soil physicochemical properties play an important role in the efficiency of phytoremediation and soil arability after phytoremediation.Soil pot experiments were conducted to investigate the dynamic changes of physicochemical properties in phenanthrene（a representative of polycyclic aromatic hydrocarbons）-contaminated soil under wheat and clover intercropping.The results showed that plants improved the pH values of phenanthrene-polluted soil with a maximum variation pH of 0.61.The difference in pH between wheat/clover intercropping and wheat/clover single cropping was not significant.Soil organic matter,total nitrogen,available nitrogen,total phosphorus,available phosphorus,cation exchange capacity and available potassium decreased over the experiment period due to biodecomposition and plant root absorption.The intercropping of wheat and alfalfa accelerated the consumption of the above-mentioned nutrients.And the decrease percentages ranged from 5.24% to 57.85%,more than those of wheat or alfalfa only planted with decrease percentages between 6.29% and 39.09%.In particular,soil available nitrogen and availiable phosphorus decreased more than the other nutrients with a maximum reduction percentage of 57.85%.Therefore,the application of nitrogen and phosphorus must be paid more attention during phytoremediation of polycyclic aromatic hydrocarbon-contaminated soil in the wheat and alfalfa intercropping system.

关 键 词： 多环芳烃 菲 土壤理化性质 小麦 苜蓿 套作

领　　域： [环境科学与工程]