镉在白骨壤模拟湿地系统中的分布、迁移及净化效应  

Distribution,migration and purifying effect of cadmium in artificial Avicennia marina wetland system

作　　者：陈桂葵[1] 陈桂珠[2] 

机构地区：[1]华南农业大学农学院,广州510642 [2]中山大学环境科学研究所,广州510275

出　　处：《应用生态学报》2005年第3期550-554,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目 ( 39470 1 5 1 ) .

摘　　要：在温室中建立红树林植物白骨壤模拟湿地系统 ,分别用正常 (C1)、5倍 (C5 )和 1 0倍 (C10 ) 3种人工配置的不同浓度的污水每周定时定量对模拟系统污灌 1年 ,研究重金属Cd的分布、迁移以及系统对Cd污染的净化效果 .结果表明 ,由人工污水加入系统中的Cd主要存留在土壤子系统中 ( 87 6 7%～ 96 74 % ) ,只有很少部分迁移到植物体和凋落物中 ,约占总加入量的 0 4 3%～ 3 2 3% ;白骨壤植物各器官中Cd含量在根中最高 ;模拟系统对污水中Cd的净化效果显著 ,在植物 土壤系统中 ,正常、5倍和 1 0倍浓度组的净化率分别为 90 4 3%、97 1 7%和 97 0 6 % ,在无植物系统中 ,对应组分别为 93 2 9%、93 1 0 %和 90 54% .An artificial mangrove Avicennia marina wetland was set up in a greenhouse,and an irrigation experiment with synthetic wastewater was performed to research the behavior of cadmium in the artificial wetland system.The synthetic wastewater C 1 had the characteristics and strength similar to normal municipal sewage,while C 5 and C 10 had the nutrients and heavy metals as five and ten times as those in C 1,respectively.The control was of 15‰ salinity.All the test wastewater was quantitatively irrigated weakly for a year.The results showed that the cadmium in the synthetic wastewater discharged into the system was mainly stagnated in soil subsystem (87.67%～96.74%),and only a small portion (0.43%～3.23%) migrated into plants and litters.After a year trial,the Cd content in roots was more than that in stems and leaves.The artificial Avicennia marina wetland system did have a significant effect on purifying cadmium in synthetic wastewater,and the purification rate for C 1,C 5 and C 10 was 90.43%,97.17% and 97.06%,respectively.

关 键 词：白骨壤 模拟湿地系统 镉 分布 迁移 净化效应 

分 类 号：X171[环境科学与工程—环境科学]