香蒲-表面流湿地系统净化灌溉水过程中镉的分布和累积  

Cadmium distribution and accumulation in surface-flow constructed wetland system with planted Typha Angustifolia L.

作　　者：喻理[1] 许蒙[1] 叶长城[1] 陈喆[2] 彭亮[1] 孙健[3] 刘孝利[1] 铁柏清[1] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128 [2]中山大学环境科学与工程学院,广州510275 [3]广东工业大学环境科学与工程学院,广州510006

出　　处：《农业环境科学学报》2016年第8期1573-1579,共7页Journal of Agro-Environment Science

基　　金：农业部财政部项目(农办财函[2014]28号)

摘　　要：以室外人工湿地系统进行农田灌溉水净化试验,分析Cd在表面流人工湿地中的分布和累积规律,旨在为利用人工湿地净化灌溉水中镉提供理论依据。结果表明:湿地平均水力停留时间为1.62 d,湿地对Cd的平均去除率为68.88%。香蒲地下根茎Cd含量较高,最高可达127.39 mg·kg^(-1),地上茎叶Cd含量较低,最高为14.65 mg·kg^(-1),其富集系数与转运系数范围分别为6.58~41.26、0.037~0.107,说明香蒲具有净化灌溉水中Cd的潜力,Cd主要积累在地下部分。Cd在香蒲与底泥中的含量随水流沿程的延长呈递减趋势,且随着时间的推移逐渐增加。底泥中各点位Cd形态所占比例平均值大小依次为B2>B1>B3>B4,其潜在有效性较大。Distribution and accumulation patterns of cadmium （Cd） were investigated in a surface flow artificial wetland system（SFAW）with Typha A ngustifolia L. designed for purification of wastewater for field irrigation. Results showed that 68.88% of Cd were removed by the SFAW with an average retention time of 1.62 days. The Cd content in underground and aboveground parts of Typha were respectively 127.39 mg·kg-1 and 14.65 mg·kg-1, with enrichment coefficient and transfer coefficient of 6.58~41.26 and 0.037~0.107, respectively, indi-cating that Typha has a high capacity for purifying irrigation water. The Cd content within the plant and in the sediment decreased gradually with the distance of water flow, but increased with time. The percentages of various forms of Cd in sediment decreased in order：B2〉B1〉B3〉B4, implying a high potential bioavailability of Cd.

关 键 词：人工湿地 镉(CD) 灌溉水 香蒲 分布 积累 

分 类 号：X52[环境科学与工程—环境工程]