摘要
通过构建不同植物配置的表流湿地,研究了表流湿地不同植物配置对富营养化循环水体的净化效果。结果表明,在水力负荷为1.46 m.d-1、平均水力停留时间为24 h条件下,表流湿地整体对TP、TN、CODCr及TSS的单位面积去除速率分别为13.26、57.766、2.44、70.72 mg.m-2.d-1;凤眼莲(Eichhornia crassipes)对TP、TN的单位面积去除速率最高,分别为12.82和62.95 mg.m-2.d-1,荇菜(Nymphoides peltatum)和水芹(Oenanthe javanica)最低,不同植物配置条件下水体进、出水中TP、TN浓度呈指数相关;供试植物对CODCr的单位面积去除速率随时间延长呈整体下降趋势,荇菜对CODCr的单位面积去除速率最高(P<0.05),为67.14 mg.m-2.d-1,菖蒲(Acoruscalamus)最低(45.43 mg.m-2.d-1);大薸(Pistia stratiotes)和黑三棱(Sparganium stoloniferum)对TSS的单位面积去除速率最低(P<0.05),且不同时间变化幅度较小(22.96～33.95 mg.m-2.d-1);各处理单元水体均呈碱性,东方香蒲(Typha orientaliss)、凤眼莲、菖蒲和慈姑(Sagittaria trifolia)处理的pH值明显低于其他单元。
Effects of plant disposition on purification of eutrophicated circulating water in surface flow wetlands were studied in the Beijing Wildlife Rescue Center.Results show that when its hydraulic loading remained to be 1.46 m·d-1 for 24 hours,the surface flow wetland,as a whole,could reach to 13.26,57.76,62.44 and 70.72 mg·m-2·d-1 in per-unit-area removal rate of total phosphorus（TP）,total nitrogen（TN）,chemical oxygen demand（CODCr） and total suspended solids（TSS）,respectively.Eichhornia crassipes was the highest in removing TP and TN,being 12.82 and 62.95 mg·m-2·d-1,respectively,while Nymphoides peltatum and Oenanthe javanica the lowest being 6.61 and 36.94 mg·m-2·d-1,respectively.Regression analysis indicated that TP and TN in the effluent was exponentially related to that in the influent,separately.CODCr removal rates of the macrophytes,regardless of species,decreased with the elapse of time.However,N.peltatum was the highest in removal rate,being 67.14 mg·m-2·d-1,while Acorus calamus the lowest being 45.43 mg·m-2·d-1.Pistia stratiotes and Sparganium stoloniferum were the lowest in TSS removal rate（P0.05） and the rates varied in a narrow range（22.96-33.95 mg·m-2·d-1） with time.The pH values of Typha orientaliss,E.crassipes,A.calamus and Sagittaria trifolia were obviously lower than other units.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2011年第2期81-86,共6页
Journal of Ecology and Rural Environment
基金
北京市科技计划重大项目(D08040600580000)
林业公益性行业科研专项(200904001)
关键词
湿地植物
富营养化
表流湿地
水体净化
wetland plant
eutrophication
surface flow wetland
water purification
