摘要
以浮床空心菜(Ipomoea aquatica)、水芹(Oenanthe javanica)和无植物系统为对象,研究了其在富营养化水体中对N、P的去除及其N2O的排放情况.结果表明,浮床植物系统对水体中N、P具有良好的净化效果,植物组织所累积的N、P量分别占各自系统去除量的40.32%～63.87%,说明植物的同化吸收作用是N、P去除的主要途径.换水周期内浮床植物系统中硝化反应进行充分,而反硝化反应相对缓慢,导致系统具有较高的NH4+-N去除率,而产生NO3--N累积.植物的存在降低了系统中N2O的排放通量.生长较好的空心菜系统在换水前后平均N2O排放量最低,为17.14μgN·m-2h-,空白高达85.08μgN·m-2h-1,水芹为37.38μg N·m-2·h-1.
The study on the N and P removal and N20 release of eutrophic water body under planted float lpomoea aquatica and Oenanthe javanica showed that planted float had a good effect on the removal of N and P from eutrophic water body. The bioaccumulation of N and P by the plants accounted for 40.32 % ～ 63.87 % of the N and P removal, respectively, suggesting that plant uptake was the main removal process. Within the treating period, there was a rapid and sufficient nitrification but a slow and insufficient denitrification in the planted float system, and thereby, planted float system had a high NH4^＋ -N removal rate and NO3^- -N accumulation. The presence of planted float reduced the release flux of N20, which was 17.14 μg N·m^-2·h^-1 for Ipomoea aquatica, 37.38 μg N·m^-2·h^-1 for Oenanthe javanica, and 85.08 μg N·m^-2·h^-1 for the control.
出处
《应用生态学报》
CAS
CSCD
北大核心
2005年第11期2199-2203,共5页
Chinese Journal of Applied Ecology
基金
国家"十五"重大科学技术攻关资助项目(2002AA601012).
关键词
富营养化
浮床植物系统
N、P
硝化和反硝化
净化
N2O
Eutrophication, Planted float system, N and P, Nitrification and denitrification, Removal, N2O.
