Water blooms leading by eutrophication had become a serious problem threatening the safety of drinking water.

富营养化引起的水体“水华”已成为威胁饮用水安全的严重问题。

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Among these toxins, microcystins-water blooms happen much frequently, produce much toxins and do much harm than any others in freshwater.

其中微囊藻是淡水水体中出现频率最高、产生量最大和造成危害最严重的产毒蓝藻。

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ObjectiveTo investigate the level of microcystins(MC)in source and drinking water of a city along Lake Tiahu where toxic water blooms frequently occurred.

目的了解有毒蓝藻水华频繁暴发的太湖流域周边城市水源水和饮用水中微囊藻毒素（MC）的含量。

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However, scientists are testing the theory that the volcanic eruption has increased iron in the water and will prolong the spring blooms into summer.

CNN: Could volcanic eruptions signal boom time for ocean life?

They also absorb pollutants that can cause algae blooms and help clear the water.

WSJ: Chesapeake Bay grasses decline again

They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

ECONOMIST: Flood barriers