白骨壤模拟湿地系统中氮的分配、循环及其净化效应

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、5倍和 10倍浓度的人工配置的城市污水每周定时定量对模拟系统污灌 2次 ,用海水作对照 ,持续 1年。研究营养污染物氮在系统中的分配、循环及被净化的效果。结果表明 ,随污水处理浓度的升高 ,被更换的潮汐水中的含氮量和土壤含氮量都有较大提高 ;植物体各部分含氮量的高低顺序排列为叶 >茎>根 ;各处理组植物中氮元素的周转期依次为 4 81年、5 81年、4 5 8年和 5 86年 ;模拟系统对污水中氮的净化效果显著。

Allocation, circulation and purification effect of nutrient pollutant N in synthetic wastewater in Avicennia marina simulated wetland system

By setting-up simulated mangrove wetland in a greenhouse,the behavior of total nitrogen in Avicennia marina simulated wetland system was studied.Three different concentrations of synthetic wastewater,namely C 1,C 5 and C 10 and artificial seawater (control) of 1.5% salinity were discharged into the wetland in fixed quantity twice a week for a year.C 1 had the characteristics similar to normal municipal sewage and C 5 and C 10 were five and ten times of nutrients and heavy metals as that in C 1 respectively.The results indicated that sewage irrigation could increase the content of nitrogen in tidal water and soil.The order of nitrogen content in plant was leaf>stem>root.The circulation period of nitrogen up-taken by plants was about 5 years.The simulated wetland system had significant purifying effect on nitrogen in synthetic wastewater.