Method for purifying eutrophic water body by utilizing water hyacinths, grass carps and bellamya

The invention provides a method for purifying a eutrophic water body by utilizing water hyacinths, grass carps and bellamya. The method comprises the following steps: firstly, selecting the water hyacinths to absorb nitrogen and phosphorus in the eutrophic water body; secondly, selecting the grass carps to eat roots of the water hyacinths, so as to control the excessive propagation of the water hyacinths; finally, selecting the bellamya to eat organic fragments including excrement of the grass carps, so as to further reduce the nitrogen and the phosphorus in the eutrophic water body. By adopting the synergistic effect of the water hyacinths, the grass carps and the bellamya, the total nitrogen content of the eutrophic water body is reduced by 78 percent and the total phosphorus content isreduced by 70 percent; the eutrophic water body is purified in an efficient and low-cost manner. 本发明提供种利用水葫芦、草鱼和环棱螺净化富营养水体的方法。首先，选用水葫芦吸收富营养水体中的氮磷，其次，选用草鱼摄食水葫芦的根部来控制水葫芦的过度繁殖，最后，选用环棱螺摄食包括草鱼的粪便在内的有机碎屑进步降低了富营养水体中的氮磷。利用水葫芦、草鱼和环棱螺三