利用人 工栽 培方法, 研 究了 武汉东 湖重污 染区 湖水 和底 泥对 黄丝 草(Potamogeton maackianus A .Benn.)生长的影响。 以湖滨黄棕色粘土作对照, 在上覆水条件相同时, 东湖底泥上培养的黄丝草生长良好, 生物量高, 枝条较长。 东湖底泥中黄丝草根系较纤细, 每个植株的根数也较少 , 但根系活力明显高于对照。 底泥中有机质过高对黄丝草根系发育不利。 东湖湖水的水质状
况对黄丝草的生长也有一定的影响, 在底质相同的情况下, 在湖水中生长的黄丝草生物量低, 根茎重量比小, 根数少。 对东湖黄丝草种群消失机理和水生植被重建对策也作了探讨。
 

The effects of the overlying w ater and sediment from the heavily polluted area of Donghu Lake of Wuhan on the growth of Potamogeton maackianus A .Benn .were surveyed under using artificial culture method .The shoots of P .maackianus are well developed on the lake sediment when it is cultured in cement tank , and the biomass and shoot height of the plant are both much higher than those of the control plants cultured on the brown clay in the same tank .The activity of root system in the lake sediment is also much higher than that of the root system in clay .However , the roots of this plant are slender and the root number per shoot is lower in the lake sediment as compared to the control. It is shown that the sediment is certainly the main source of nutrients for submerged m acrophytes and the roo ts play an important role in the uptake of nutrients from sediment besides the attachment to substrate .The results also showed that the overlying water from the heavily polluted area of Donghu Lake affected on the growth
and development of P .maackianus. When P .maackianus grow in the lake water, their biomass , weight ratio between root weight and shoot weight and root numbers are low .The mechanism responsible for the extinction of P .maackianus and strategies for aquatic macrophyte rehabilitation are also discussed .