Abstract: Effects of ecological factor such as water depth and light on turion germination of Potamogeton crispus L. had been studied much. By field investigation, the authors found that turion weight ,their quantitive ratio and the time to germinate differed significantly. Effects of these factors on turion germination and seedling growth were not studied before. Germination experiment was done in our laboratory to supplement data about turion propagation of P. crispus L. and it may supply reference for population scale controlling of P. crispus L..The results showed that weight of turions differed widely. Of all the turions, a 80% percentage was those with medium weight. Weight of turions had no effects on the final germination ratio but small turions germinated relative early. Big turions brought relative more seedlings lastly and the relationship between turion weight and finally seedling number was positively linear(p＜0.05). During continuous removal of seedlings, germination ratio and seedling number of big turion were keeping high. After three months store under different temperature, all turions germinated earlier and concentrative than those unstored. High temperature(25℃) and low temperature(4℃) went against to the number of seedlings. Store temperature had no effects on final germination ratio and the length of seedlings.

Key words: Potamogeton crispus L., turion, germination ratio, seedling, hydrophyte