河岸带土壤对不同pH雨水中截留磷的影响  

Effect of retention of phosphorus in riparian zone soil on different pH rainwater

作　　者：刘超[1] 毕春娟[1] 陈振楼[1] 诸葛祥真[1] 

机构地区：[1]华东师范大学地理科学学院,地理信息科学教育部重点实验室,上海200241

出　　处：《环境工程学报》2017年第5期3233-3238,共6页Chinese Journal of Environmental Engineering

基　　金：上海市科委社会发展重点项目(12231201900);上海市自然科学基金项目(12ZR1409000);华东师范人学大型仪器设备开放基金项目

摘　　要：通过河岸带土柱淋滤模拟实验,研究了不同pH值模拟雨水条件下河岸带土壤对雨水中磷的截留效应,分析了pH对河岸带土壤吸附磷素的影响机制。结果表明:在不同pH的模拟雨水处理下,河岸带土壤对TDP和MRP的吸附具有显著的差异;且在pH=5条件下河岸带土壤对磷素的吸附量最低。河岸带土壤对雨水中磷的去除率随着降雨时间的进行而不断下降,pH=5时,河岸带对磷的去除率最低,截留能力最弱。不同pH值的模拟雨水对土柱中TP的含量产生显著影响,pH=5时,土柱中TP含量最高,pH=3时,TP含量最低。土柱中的TP在表层10 cm含量最高,随深度的增加而不断降低。研究河岸带土壤对不同pH雨水中磷的截留效应对于理解磷在河岸带土壤中的迁移转化机理以及防治水体富营养化具有十分重要的意义。A phosphorus leaching experiment was performed to study interception of phosphorus in the riparian zone. The removal rate of phosphorus by the soil of the riparian zone is discussed. Results showed that the pH of the simulated rainwater,which acted as leach-water, significantly affected the absorbed phosphorus in the riparian zone soil column. Riparian zone soil column absorbed the minimum TDP and MRP when the rainwater had a pH of 5. The removal rate of the soil of the riparian zone decreased as time went by. The riparian zone had the low- est interception capacity for phosphorus when the rainwater had a pH of 5. The pH significantly influenced the concentration of TP in the soil columns. The concentration of TP was the highest when the pH was 5 and the low- est when the pH was 3. Phosphorus had a high concentration in the first 10 cm of soil from the surface. As the depth increased,the concentration of phosphorus decreased. Understanding the effects of pH on P retention in ri- parian zone soil will help us understand the transfer and transformation of P in riparian zone soil;this would play an important role in preventing and controlling the eutrophication of water bodies.

关 键 词：河岸带 磷 PH 截留 

分 类 号：X53[环境科学与工程—环境工程]