3种植物浮床对冬季富营养化水体氮磷的去除效果研究

采用浮床栽培黑麦草(Lolium multif)、"矮脚黄"和"苏州青"(后两者为青菜品种,Brassica rapa)研究其对冬季天然富营养化水体中N、P的去除效果。结果表明:黑麦草、"矮脚黄"、"苏州青"和对照对富营养化水体中总N的平均去除率分别为49.75%、45.77%、45.12%和28.91%,对总P的平均去除率分别为67.66%、60.19%、58.28%和42.56%,植物处理的去除效果与对照之间均达显著差异(P<0.05),它们为冬季富营养化水体的处理提供了新的植物资源。黑麦草对P的去除以吸收作用为主,植物累积的P占所去除P总量的89.53%,"矮脚黄"和"苏州青"则分别为34.64%和42.42%;但植物累积的N只占去除N总量的一小部分。

Nitrogen and phosphorus removal performance by three planted floats in eutrophic water bodies in winter

N and P removal performance of planted floats of ryegrass(Lolium multif),"Aijiaohuang" and "Suzhouqing"(the latter two are cultivars of Brasica rapa)in natural eutrophic water bodies were investigated.Results show that the removal percentage by ryegrass,"Aijiaohuang","Suzhouqing" and the control are 49.75%,45.77%,45.12%and 28.91% in TN respectively;and 67.66%,60.19%,58.28% and 42.56% respectively in TP.The removal efficiency of the planted floats in TN and TP are significantly different(P<0.05) from those of the control.The three plants are the new and alternative plant resources for the treatment of eutrophic water bodies.Phosphorus bioaccumulation by ryegrass accounts for 89.53% of total removed phosphorus in the system and 34.64%and 42.42% for "Aijiaohuang" and "Suzhouqing",suggesting that abstraction is the main removal mode of phosphorus.For nitrogen,bioaccumulation accounts for only a small percentage of total removed nitrogen.