常见沉水植物对草海水体(含底泥)总氮去除速率的研究

Study on the Removal Rate to Total Nitrogen in Caohai Lake (Including Sediments) by Common Submerged Macrophytes

利用狐尾藻、菹草、苦草、伊乐藻、金鱼藻、篦齿眼子菜、轮藻等７种沉水植物对受污染的草海水体（含底泥）总氮去除速率进行了试验研究。结果表明：每种沉水植物对水体总氮、总磷均有显著去除作用，在试验的２７ｄ内，对总氮、总磷的去除百分率分别为８０３１％，８９８２％；重点对７种沉水植物引起水体总氮浓度下降与时间的关系作回归分析，所得结果是随着时间的延长，水体中总氮浓度呈负指数形式衰减。该文还研究了水体总氮浓度与去除速率之间的关系。每种沉水植物在试验的总氮浓度范围内（２６２８～１６６６７ｍｇ／Ｌ）去除速率随总氮浓度的增加而增加。对ＴＮｔ曲线和Ｖ－ＴＮ曲线在大型水生植物系统恢复中的应用进行了讨论。

The removal ability to total nitrogen (TN) from polluted water in Caohai Lake byseven species submerged macrophytes including Potamogeton crispus,Vallisneria spiralis,Myriophyllum spicatum,Ceratophyllum demersum.Potamogeton pectinatus,Chara sp .,Edodea canadinsis were studied in this paper.Results show that each species has great ability to remove TN and total phosphorous (TP);during the 27d experiment period,the removal percentage to TN and TP is 80 31% and 89 82%,respectively;TN concentration in water declined in negative exponent form with the time continuing;within the given TN concentration range (2 68～16 667mg/L),The removal rate of each species increased with TN concentration increasing.Furthermore,the use of TN t and V TN curves for restoration of aquatic macrophytes is discussed.