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Physico-Chemical and Microbiological Assessment of Organic Pollution in Plain Salty Lakes from Protected Regions

Journal of Environmental Protection 2017年第12期8卷 1474-1489页

作者： Veronica Lazar Carmen Curutiu Ditu Lia-Mara Alina Holban Irina Gheorghe Florica Marinescu Mihaela Ilie Alex Ivanov dumitru dobre Mariana Carmen Chifiriuc Botany-Microbiology Department Faculty of Biology University of Bucharest Bucharest Romania The Research Institute of the University of Bucharest Bucharest Romania Maximilian Association Buzau Romania The National Institute for Research and Development in Environmental Protection-INCDPM Bucharest Romania

One of the most important goals of EU nature and water framework directives is to ensure healthy aquatic ecosystems by the protection of the most valuable species and habitats form the Natura 2000 network, while at the same time ensuring a balance between water/nature protection and the sustainable use of nature’s natural resources. The purpose of this study was to evaluate the physico-chemical and microbiological characteristics of four Romanian salty plain lakes included in Natura 2000 Network, in order to assess the degree of organic pollution and to generate the knowledge required for the design and implementation of appropriate measures for maintaining the balance between the water protection and the sustainable use of these protected ecosystems. The water and sediment sampling was performed in two consecutive years (2015 and 2016), in September and the following standard parameters have been determined: pH, chemical oxygen consumption (COC), the degree of trophicity and salinity of the environment, metals content, microbiological indicators and microbial physiological groups involved in nutrient cycling. The pH ranged from 7.56 to 8.93, close or above the upper normal limit of 8.5, being correlated with a high salinity characteristic of chlorinated, sulphated, high sodium and magnesium content waters. Despite the similar values recorded for the physico-chemical parameters in the two consecutive years suggesting a certain degree of stability of the investigated aquatic ecosystems, the COC values indicate a high degree of hypertrophy, which could be attributed to the reduced surface area, ecological pisciculture and agriculture input. The microbiological parameters revealed the existence of both recent and chronic fecal pollution source. The high hypertrophy degree could represent a positive premise for the high productivity of the investigated ecosystems, but also an alarm signal for excessive organic pollution, with the risk of redox potential decrease which c

关键词： Salty Lakes Physico-Chemical Characteristics Microbiological Parameters Protected Ecosystems Hypertrophy

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