Reconstruction of past anthropogenic impact intensity in Lake Engure using sedimentary record analysis

Environmental pollution with trace elements is considered as one of the most important environmental problems. Analysis of trace element accumulation in sedimentary phases of lakes may reflect the overall regional pollution level, and analysis of trace element accumulation patterns in sediment profi...

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Published in:Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences Natural Sciences, 2011-01, Vol.65 (5-6), p.146-153
Main Authors: Kļaviņš, Māris, Pujāte, Agnese, Kokorīte, Ilga, Kalniņa, Laimdota, Rodinovs, Valērijs, Ansone, Linda, Mažeika, Jonas, Jankēvica, Maruta, Bogans, Egils, Švāgere, Anda
Format: Article
Language:English
Subjects:
Accumulation
Anthropogenic factors
lake sediments
Lakes
Metal concentrations
organic matter
paleolimnology
pollen
Pollution levels
Sediments
spectrophotometry
trace and major elements
Trace elements
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Summary:Environmental pollution with trace elements is considered as one of the most important environmental problems. Analysis of trace element accumulation in sedimentary phases of lakes may reflect the overall regional pollution level, and analysis of trace element accumulation patterns in sediment profiles can help to reconstruct the history of anthropogenic impact. The aim of this study was to analyse trace element concentrations in sediments of Lake Engure in Latvia and to determine factors influencing their availability. The metal concentrations in sediments of Lake Engure are at background levels, especially compared with metal concentrations in West European countries. However, the change in element concentration in sedimentary profiles provides information about trends of recent accumulation (within the last 100 years) and on the balance between natural and human-induced accumulation processes. Vides piesārņojums ar toksiskiem mikroelementiem ir viena no nozīmīgām vides problēmām. Mikroelementu uzkrāšanās ezeru nogulumos ļauj novērtēt vispārējos piesārņojuma līmeņus ezera sateces baseinā, bet metālu sadalījums nogulumu vertikālajā profilā atspoguļo cilvēka ietekmes mainības raksturu. Pētījuma mērķis ir analizēt mikroelementu koncentrāciju Engures ezera nogulumos un izvērtēt to saturu ietekmējošos faktorus. Salīdzinot ar mikroelementu koncentrāciju Rietumeiropas valstu ūdenstilpju nogulumos, metālisko elementu koncentrācijas Engures ezerā ir tuvu fona līmenim. Tomēr pētīto elementu koncentrāciju izmaiņas nogulumu profilā ļauj izvērtēt antropogēnās slodzes mainības raksturu pēdējo 100 gadu laikā un raksturot antropogēno un dabiski noritošo procesu mainības raksturu.
ISSN:1407-009X
2255-890X
DOI:10.2478/v10046-011-0030-4