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81.
Copper, a priority substance on the EU-Water Framework Directive list, is widely used to protect grapevines against fungus diseases. Many vineyards being located on steep slopes, large amounts of Cu could be discharged in downstream systems by runoff water. The efficiency of stormwater detention basins to retain copper in a vineyard catchment was estimated. Suspended solids, dissolved (Cudiss) and total Cu (Cutot) concentrations were monitored in runoff water, upstream, into and downstream from a detention pond. Mean Cutot concentrations in entering water was 53.6 μg/L whereas it never exceeded 2.4 μg/L in seepage. Cutot concentrations in basin water (>100 μg/L in 24% of the samples) exceeded LC50 values for several aquatic animals. Copper was principally sequestered by reduced compounds in the basin sediments (2/3 of Cutot). Metal sequestration was reversible since sediment resuspension resulted in Cu remobilization. Wind velocity controlled resuspension, explained 70% of Cudiss variability and could help predicting Cu mobilization. 相似文献
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NISIKAWA USIO MIHO IMADA MEGUMI NAKAGAWA MUNEMITSU AKASAKA NORIKO TAKAMURA 《Conservation biology》2013,27(6):1429-1438
Farm ponds have high conservation value because they contribute significantly to regional biodiversity and ecosystem services. In Japan pond draining is a traditional management method that is widely believed to improve water quality and eradicate invasive fish. In addition, fishing by means of pond draining has significant cultural value for local people, serving as a social event. However, there is a widespread belief that pond draining reduces freshwater biodiversity through the extirpation of aquatic animals, but scientific evaluation of the effectiveness of pond draining is lacking. We conducted a large‐scale field study to evaluate the effects of pond draining on invasive animal control, water quality, and aquatic biodiversity relative to different pond‐management practices, pond physicochemistry, and surrounding land use. The results of boosted regression‐tree models and analyses of similarity showed that pond draining had little effect on invasive fish control, water quality, or aquatic biodiversity. Draining even facilitated the colonization of farm ponds by invasive red swamp crayfish (Procambarus clarkii), which in turn may have detrimental effects on the biodiversity and water quality of farm ponds. Our results highlight the need for reconsidering current pond management and developing management plans with respect to multifunctionality of such ponds. Efectos del Drenado de Estanques sobre la Biodiversidad y la Calidad del Agua en Estanques de Cultivo 相似文献
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尾矿库在使用的过程中,由于设计或施工的不合理,有可能导致在坝底或坝外坡出现尾砂渗漏的情况,往往造成一定的环境污染.对尾矿库尾砂渗漏的反滤原理进行了总结,并运用这一原理对某尾矿库的尾砂渗漏问题进行了反滤分析及设计,取得了较好的应用效果. 相似文献
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SHI Lei WANG Bao zhen CAO Xiang dong Wang Jin LEI Zhi hong WANG Zhi ren LIU Zheng ying LU Bing nan 《环境科学学报(英文版)》2004,16(3):476-481
IntroductionTheconstructedwetlandshavebecomeaglobaltechnologyforwaterpollutioncontrolbothindevelopedanddevelopingcountries(Seidal,196 6 ,1976 ;Kickuth ,1977;Cooper,1995 ;IWA ,2 0 0 0 ) .Recentinventoriesindicatedthattherearemorethan 6 0 0 0andmorethan 10 … 相似文献
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文章首先对藻类污染生态学的发展历史作了简单回顾,接着对其主要研究领域(水污染对藻类的影响和藻类净化水质)及研究成果进行了综述,在此基础上指出了其今后的发展趋势。 相似文献