Urban runoff pollution is serious especially for earlier runoff and it is one of the reasons that lead to water body eutrophic , algal bloom and red tide on sea.

城市雨水径流特别是初期雨水污染严重，是水体富营养化、水华以及海域赤潮等环境问题产生的根源之一。

Urban runoff pollution is serious especially for earlier runoff and it is one of the reasons that lead to water body eutrophic, algal bloom and red tide on sea.

城市雨水径流特别是初期雨水污染严重，是水体富营养化、华以及海域赤潮等环境问题产生的根源之一。

The scientist studied the algal bloom in the lake.

科学家研究了湖中的藻类繁殖现象。

The comparison of algal composition and abundance between bottom layer of ice and surface layer of water suggests that it is different except in late November when the spring ice algal bloom occurred.

从冰底和水表藻种组成的对比表明，两者仅在春末冰底冰藻水华期间具有较强的相似性。