Experimental Study of Decontamination and Resistance Ability of Five Hydrophytes

By artificial imitation of the low temperature weather condition of Taihu area, five hydrophytes, in terms of Elodea Canadensis Michx., Potamogeton maackianus A. Benn, Potamogeton malaianus Miq., Oenanthe javanica (Bl.) DC. and Acorus tatarinowii Schott, were used to investigate the effects on decontaminating nitrogen and phosphorus at the different nutrition levels. At the same time, some physiological and biochemical indexes of the hydrophytes were systemically and comparatively studied. The results show that all the hydrophytes absorb the nutrient substance effectively and the effects of Oenanthe javanica (Bl.) DC. and Potamogeton maackianus A.Benn's are the best two. The prolines of hydrophytes are increasing with the increasing nutrition mass concentration of the water. At the same experimental condition, the Oenanthe javanica (Bl.) DC. and Potamogeton maackianus A.Benn have the highest accumulative multiples of hydrophytes' proline with time, indicating that they have strongest resistance. When the nutrition mass concentration exceeds a certain threshold, the biomasses of hydrophytes are descending with the increasing level of the water nutrition. Oenanthe javanica (Bl.) DC. and Potamogeton maackianus A. Benn, are optimal hydrophytes to construct floating aquatic macrophyte-based treatment system (FAMS) for eutrophication waters remediation at Taihu areas.