Celem niniejszej pracy było badanie chemizmu wód układu hydrograficznego Zatoka Elbląska - rzeka Elbląg - jezioro Druzno tworzącego zwarty układ hydrodynamiczny, który można określić jako quasiestuariowy. Quasiestuariowy, gdyż dochodzi tu jedynie do okresowych, a nie cyklicznych penetracji wód słonawych w górę tego układu. Wykonane pomiary wykazały, że około 20% pobranych prób dokumentuje wystąpienie wlewów wód Zalewu Wiślanego do estuarium. Stwierdzono, że wlewy obejmowały bądź cale estuarium tzw. wlewy pełne albo tylko jego część, w których wody słonawe docierały tylko do północnego akwenu jeziora Druzno tzw. wlewy niepełne. Zarejestrowane wlewy wystąpiły tylko przy sprzyjających warunkach hydrometeorologicznych. Właśnie od sytuacji hydrometeorologicznej zależało czy wystąpił wlew pełny czy niepełny.

The paper is designed to present a method to estimate greenhouse gases (GHG) uptake or emissions in the absence of data for peat bog areas (GEST method). The paper presents the research results produced by a project on “Limiting CO2 emissions via the renaturalisation of peat bogs on the Eastern and Central European Plain”. The study area consisted of three peat bogs: Kluki, Ciemińskie Błota, and Wielkie Bagno (Słowiński National Park). The GEST method relies on the estimation of gas emissions on the basis of vegetation and water levels and greenhouse gas coefficients for each given habitat type provided in the research literature. The greenhouse gas balance was calculated for a baseline scenario assuming the lack of human impact and for a scenario taking into account human impact in the form of peat bog preservation. Initial research results indicate that there is a total of 41 GESTs in the studied bog areas and that a reduction in CO2 emissions of approximately 12% will occur following what is known as renaturalisation by raising the groundwater level, felling of trees across the bog, and making changes in habitats.

The main goal of the presented research was to investigate spatial distribution of surface sediments and to recognize relationships between chemical composition of water and sediments in a coastal Lake Sarbsko (northern Poland). The Lake Sarbsko is a freshwater basin. The water column is well oxygenated and waters exhibit only minor spatial variability of chemical composition indicating rapid and good mixing. Surface sediments of Lake Sarbsko are strongly diversified with respect to chemical composition. The sediments of Lake Sarbsko are characterized by elevated content of terrigenous silica indicating enhanced input of clastic material from the watershed and/or increased dynamics of the lake waters. Moreover, SiO2ter is strongly negatively correlated with SiO2biog, organic matter and element contents, which argues for diluting effect of the former towards authigenic components of sediments. Basically, terrigenous silica (quartz) content is highest in the lake shores and declines towards the lake center. Biogenic silica, organic matter and most of elements display reversed tendency. CaCO3 was encountered in three isolated areas, where it co-occurs with FeS. It is anticipated that precipitation of calcite in Lake Sarbsko resulted from postdepositional processes. Spatial distribution of Fe, Mn, Ca, Mg, Na and K in Lake Sarbsko is also governed by their geochemical affinities to organic matter (Fe), Fe/Mn oxides (Fe, Mn), sulphides (Fe), clay minerals (Na, K, Mg, Mn) and carbonates (Ca, Mn).