冬季低温条件下浮床植物对富营养化水体的净化效果

Purification effects of floating bed plants on eutrophic water body under low temperature in winter

在冬季低温条件下,采用浮床无土栽培技术,研究了水芹菜、多花黑麦草以及大蒜3种耐寒植物对富营养化水体的净化效果。试验结果表明,3种植物在水温4.0～10.1℃的条件下均生长良好,对水体中TN、NH+4N、TP、CODMn污染物的去除率分别为59.3%～29.2%、65.2%～39.3%、55.6%～33.9%,55.7%～49.5%,对藻类的抑制率为88.4%～92.3%。通过比较,水芹菜净化能力最强,多花黑麦草次之,大蒜最弱。本项研究丰富了冬季低温条件下治理富营养化水体的方法,也为冬季浮床植物的选择提供了依据。

The purification effect of Oenanthe javanica, Lolium mutli florum and Allium sativum on eutrophic water body was investigated under lower temperature condition in winter using soilless floating bed. The results showed that all the three plants grew well when the water temperature was controlled between 4.0℃ and 10. 1℃. The removal rates of TN, NH4^＋-N, TP, CODMn from water were 59.3% ～29.2%, 65.2% ～39.3%, 55.6% 33.9%,55.7%～49.5%,respectively;while the inhibition on alga was 88.4%～92.3%. Among the three kinds of plants,the purification capacity of Oenanthe javanica is best and the Allium sativum is worst. The investigation will not only enrich the approaches of dealing with eutrophic water body under lower temperature condition in winter, but also offer a reason for the choice of floating bed plant in winter.