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上海市吴淞口及西区、南区排污口附近水域异养细菌及粪大肠菌群的数量普遍较高,表层水体这两种细菌的最高值分别达2.2×1012个/dm3和2.4×109个/dm3。其空间分布特点是平行于岸边的带状分布且数量梯度明显。水体富营养化程度与异养细菌和粪大肠菌群数量成正相关,回归分析结果还表明,高水温、高含油量和低溶解氧的水体细茵数量偏高。根据单项评价指标,排污口水域在不同程度上都有温血动物粪便污染迹象,其中严重污染级的占总测站的1/3以上。
The population of heterotrophic bacteria and fecal coliform in the waters near Wusongkou and the west and south of China’s sewage outfalls were generally high. The highest values of the two bacteria in surface waters were 2.2 × 1012 / dm3 and 2.4 × 109 / dm3. Its spatial distribution is parallel to the shoreline zonal distribution and the number of significant gradient. The degree of eutrophication is positively correlated with the number of heterotrophic bacteria and fecal coliform, and the regression analysis also shows that the number of bacteria in water bodies with high water temperature, high oil content and low dissolved oxygen is high. According to the individual evaluation index, the sewage outfall area shows signs of fecal contamination of warm-blooded animals to varying degrees, among which, severe pollution level accounts for more than 1/3 of the total stations.