中文摘要：

通过向底泥中投加不同量的蔗糖使其发生厌氧反应以模拟不同程度的底泥厌氧环境，研究这种环境和光照强度对菹草石芽萌发和幼苗生理作用的影响。实验结果表明，底泥厌氧环境能显著降低菹草石芽的最终萌发率，且低光照会加剧这种趋势；尽管低光照不一定会提高最终的萌发率，但对提早石芽的萌发是有利的。在0．1％蔗糖投加处理中，幼苗的叶绿素和可溶性蛋白含量最高（平均为2．50和19．28mg／gFW），其后随投加量的升高而降低，而游离氨基酸的含量却一直呈上升趋势，最高时达到0．24mg／gFw，但低光照却使它下降；可溶性糖含量基本不受底泥厌氧水平的影响，但随着光照减少而降低。随着厌氧水平的增加（从对照到0．5％蔗糖投加量），菹草的超氧物歧化酶（SOD）活性呈现上升趋势，但在1．0％蔗糖投加处理中活性降至最低；而过氧化物酶（POD）活性一直处于下降趋势。研究结论是：底泥厌氧对菹草石芽萌发影响显著，这种影响可能比低光照的限制作用还要重要。轻度的厌氧环境反而能促进菹草幼苗的生理代谢，但随厌氧水平的升高对碳氮平衡和其它生理活动产生不利影响。此外，底泥厌氧环境对菹草幼苗的抗氧化系统也有明显刺激作用。

英文摘要：

The effects of anoxic sediment condition and light intensity on turion germination and sprout physiology of Potarnogeton crispus L. were studied. The anoxic condition of sediment was simulated by adding sucrose into sediment to stimulate the anaerobic mineralization of organic matters. The results showed that sediment anoxic condition reduced the accumulated turion germination rate of Potarnogeton crispus L. , low light intensity can enhance the inhibitory effect. However,low light intensity was favorable for predating the turion germination. Total chlorophyll （Chit） and soluble protein（Pr）content of the sprouts increased up to the maximum（mean 2.50 and 19.28mg/g FW） in the 0.1% addition treatment and then decreased with the increasing sediment anoxia,whereas the free amino acid（FAA） increased with the anxic level（up to 0.24 mg/g FW in the 1.0% addition treatment）. However,low light intensity reduced the FAA content, The sediment anoxia had no significant effect on soluble carbohydrate（SC） content which whereas decreased with light intensity. The superoxide dismutase（SOD） activity increased with the sediment anoxia（in the control,0.1% and 0.5% addition treaments） then decreased down to the minimum in the 1.0% addition treatment. The peroxidases（POD） activity was kept declining with the anxic level. It was concluded that the turion germination of P. crispus can be affected significantly by the sediment anoxia and the effects may be more important than that of the low light intensity. Slight sediment anoxia is favorable for physiology of the sprouts,but more severe sediment anoxia press the carbon/nitrogen balance and other physiological activities. Moreover, sediment anoxia and light intensity have significant influences on the antioxidative enzymes of the sprouts.