【摘要】 通过室外人工试验池栽培,对太湖马来眼子菜的生长特征和氮磷去除效果进行了研究。结果表明:生长初级阶段,较浅的水深能明显促进马来眼子菜的生长。不同水深的马来眼子菜生物量变化介于810~2 941 g/m3。生长后期,随水深的增加,植株高度呈上升趋势,其生物量相应增加。马来眼子菜的生物量、生长密度对水深的响应显著,在利用马来眼子菜对浅水湖泊进行生态系统恢复时,水深控制在100 cm,植株生长态势和对水体氮磷的去除效果最好。更多还原

【Abstract】 The effect of water depth gradient on the growth and nutrient removal rate of the submerged macrophytes Potamogeton malaianus,a dominant species in Taihu Lake,was examined in an outdoor pond experiment.At the beginning of the growth period,lower water depth increased the growth rate of P.malaianus.The growth rate reached 2.04 cm/d at the water depth about 60 cm,while 0.88 cm/d at the water depth about 180 cm.During 82 days growth period,the stem height of P.malaianus was 180 cm and the growth rate was 2.04 cm/d,while the stem height was 86 cm and the growth rate reached only 1.07 cm/d at 60 cm water depth.The stem height and the water depth was positive correlation along the water depth gradient.The biomass of P.malaianus ranged from 810 g/m3 to 2 941 g/m3.The biomass and stem height increased with the water depth.The aboveground concentration of nitrogen and phosphorus of P.malaianus was 86.43 mg/g and 5.12 mg/g,respectively at the 100 cm water depth.The TN and TP removal rate also reached the highest value of 87.6 mg/g and 40.1 mg/g,respectively at the 100 cm water depth.Compared with the TN removal rate,TP removal rate was relatively low in the different water depth gradient.TN removal rate of P.malaianus was 2.87 times of its TP removal rate. The biomass and density of P.malaianus showed an active response to the water depth gradient.The experiments showed the optimal water depth on the growth of P.malaianus and its TN and TP removal rate was 100 cm.更多还原