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首页> 外文期刊>Lake and reservoir management >Diatoms as indicators of long-term nutrient enrichment in metal-contaminated urban lakes from Sudbury, Ontario
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Diatoms as indicators of long-term nutrient enrichment in metal-contaminated urban lakes from Sudbury, Ontario

机译：硅藻是长期营养的指标浓缩metal-contaminated城市湖泊安大略省萨德伯里

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The majority of the limnological research in Sudbury, Ontario, has focused on the anthropogenic impacts of industrial emissions (SO_2 and metals), with the potential effects of cultural eutrophication largely being overlooked. However, the population of the City of Sudbury has grown with the prosperity of the mining sector, which poses a risk to the quality of freshwater resources. As with many environmental issues, there is often a lack of predisturbance data that can assist in gauging the full extent of environmental change. Therefore, paleolimnological approaches were used to track long-term biological changes in sedimentary diatom assemblages related to cultural eutrophication in 4 lakes from Sudbury. Diatom assemblages were primarily dominated by oligotrophic taxa prior to watershed development; however, with the onset of urban environmental stressors (e.g., septic systems, the application of lawn fertilizers and watershed development), there was a shift toward taxa that thrive in more productive systems. Diatom assemblages also seem to track an increase in lakewater pH through time, which is likely related to increased acid neutralizing capacity as a result of watershed disturbances, algal assimilation and bacterial reduction of NO_3~, and increased base cation export from the watershed due to acidic deposition. Insight into predisturbance conditions of the lakes should help lake managers set realistic biological targets for restoration and may be used to help gauge the response of these systems to future mitigation efforts.
机译：大多数的湖沼学的研究安大略省萨德伯里,关注工业排放的人为影响(二氧化硫和金属)的潜在影响人为富营养化很大程度上被忽视了。然而,这个城市的人口的萨德伯里已经与矿业的繁荣部门,构成的质量风险淡水资源。问题,通常会有缺乏predisturbance数据,可以帮助充分评估环境变化。paleolimnological方法被用来追踪长期的生物沉积的变化硅藻组合与文化有关从萨德伯里4湖泊富营养化。组合主要是由贫营养类群分水岭之前发展;然而,随着城市环境压力(例如,垃圾处理系统,应用程序草坪的化肥和流域开发),有一个转向类群多在茁壮成长生产系统。跟踪lakewater pH值的增加时间,这可能是导致增加酸中和能力的分水岭障碍,藻类同化和细菌减少NO_3 ~,增加基阳离子由于酸性出口的分水岭沉积。湖泊的条件应该帮助经理湖设定现实的生物修复的目标和可以用来帮助评估的反应这些系统未来的减排努力。

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