百花湖季节性水质恶化机理研究

１９９４年秋后，贵州百花湖出现水质恶化的“黑潮”事件。为认识其形成机理，对水体和沉积物柱芯分层采样。研究表明：在缺氧季节，沉积物－水界面的有机质通过生物氧化作用的分解，加剧水体缺氧并诱发磷和Ｓ＾２－释放，相伴产生ＮＯ２＾－浓度增高和Ｍｎ＾２＋的二次污染，为改善该湖水系统环境质量，应控制工业污染、生活污染和流域侵蚀，并综合整治湖区。

MECHANISM OF WATER QUALITY WORSING SEASONALLY IN LAKE AHA

Since the autumn of 1994,waters in Lake Beihua( in Guizhou)were worsen.In order to recorgnize the mechanism,we took samples of water and sedi-ment cores,The study clears that, in anoxic season,though respriation of organic material, organism in sediment-water interface is degrade, raising waters anoxic, leading P and S2-released. the concentration of ralsed and the second pollution of Mn2+ emerged. For the sake of bettering water quality of this lake system,it is necessary to control industry pollution, living pollution, basin erosion and renovate the lake area svnthesizelly.