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Eutrophication is the main environmental pollution of lake,in nowadays. In China there are more than90%lakes are in eutrophication.Eutrophication is a process of the assembling of TN (total nitrogen),TP (total phosphate). As the capacity of TN, TP is over the self-purification of lake, the ecosystem of lake is collapse, and plenty of algae propagate, result in the reducing of water transparency, rancidity of air around lake.Eutrophications not only make influence in the tourism, fishing and so on, which is based on the lake, but also the region’s healthy and safety. Contemporary, they are no standard fitting for all the lake, while the standard is constituted by the environment of lake.As a world environmental problem, the research and implement by professor and specialist give some example to the evaluation, protecting and implement.the method of fathering eutrophication of lake usually are:the controllingof nutrition salt,controlling of biology,bio-project and the recovering of ecosystem,and the implement method is variety, now,while the controlling of nutrition salt was the main measure in old days.By the monitoring of hongze lake’s22common monitor program except Ph, water temperature and comparing past years monitoring profile,it shows, in2005,hongze lake is still in eutroohication,but it’s better than past years,such as total bacteria and chl-a TSI index.Following are the main reason of hongze lake’s eutrophication:1)the input nutrition salt of external river;2)the input nitrogen and phosphate of poly source;3) the release of nutrition salt by bottom sediment.The methods for the eutrophication of hongze lake mentioned are:1) The controlling of external nutrition salt;2) Work with the "Nan shui bei diao" project;3) The controlling of output nutrition around lake;4) The controlling of internal nutrition salt;5) The controlling of biology; 6) The protect of everglade;7) The step in monitor.
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