Essays about: "sjösediment"

Showing result 1 - 5 of 11 essays containing the word sjösediment.

1. 1. Mercury accumulation in lake sediments on different time scales – the influence of algal primary production

   University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Author : Anne Rebotzke; [2023]
   Keywords : mercury; lake sediment; primary productivity; algal scavenging; biogenic silica; diatom proxy; chlorophyll-a; organic matter;

   Abstract : The aim of this work is to test the proposed approach of algal scavenging as a driver of sediment mercury (Hg) on different time scales and to gain a better understanding of the mechanisms of Hg accumulation in lake sediments. A 3000-year sediment record from Nylandssjön in northern Sweden was analysed for this purpose, as well as a 20-year sediment record from the seasonal sediment traps of this lake. READ MORE

3. 2. Sediment chemistry and the potential toxicity to benthic invertebrates in sediments affected by acid sulfate soils : A study on freshwater and marine sediments in Västerbotten, Sweden

   University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Author : June Johansson; [2020]
   Keywords : Toxicity; Benthic invertebrates; Acid sulfate soils; Sediment chemistry;

   Abstract : The leakages of metals from acid sulfate soils and their potential toxicity to benthic invertebrates were studied in the sediment profiles of Lillkvasjön and Lövselefjärden - a lake and an estuary known to be affected by acid sulfate soils - in Västerbotten, northern Sweden. The concentrations of 25 different elements were analyzed throughout both sediment profiles through X-Ray Fluorescence (XRF) Spectrometer analysis. READ MORE

4. 3. A palaeoecological study of the establishment of beech forest in Söderåsen National Park, southern Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Maja Damber; [2020]
   Keywords : Odensjön; southern Sweden; palaeoecology; pollen; macrofossils; lake sediments; Fagus sylvatica; Earth and Environmental Sciences;

   Abstract : Denna studie fokuserar på en sedimentsekvens som hämtats från Odensjön, i Söderåsens nationalpark i Skåne, södra Sverige. Den undersökta sekvensen, som täcker de översta 86 cm av sedimenten, är unik på grund av dess väldigt tydliga årsvarv, som har möjliggjort en precis datering (Hertzman in prep.). READ MORE

5. 4. Bergsbrukets början, samt dess och jordbrukets påverkan på vegetationen uti Garpenbergs socken i sydöstra Dalarna

   University essay from SLU/Dept. of Forest Ecology and Management

   Author : Björn Karlsson; [2014]
   Keywords : Pollen; geokemi; bergsbruk; gruvbrytning; Garpenberg; Bergslagen; vegetationsförändringar; skog; jordbruk; pollen; geochemistry; mining; Sweden; vegetation changes; forest; farming;

   Abstract : Bergsbruket har under lång tid haft stor betydelse för Sverige både ekonomiskt och politiskt. Det har också haft en inverkan på naturmiljön bland annat genom huggningar för bränsle och utsläpp av tungmetaller. Ett av de områden i Sverige som är mest känt för sin metallhantering är Bergslagen. Idag är många gruvor nedlagda. READ MORE

6. 5. How does urban discharge affect a lake in a recreational area in central Sweden? : a comparison of metals in the sediments of three similar lakes

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Madelene Holmblad; [2014]
   Keywords : Geografi; naturgeografi och ekosystemanalys; tungmetaller; smältvatten; sediment; Geography; physical geography and ecosystem science; heavy metals; melt water; sediments; Earth and Environmental Sciences;

   Abstract : Metal contamination of lakes can bring negative effects to aquatic biota, and to the general health of the ecosystem. Urban discharge is a known source of common metals. In cold regions, snow disposal sites further enhances the risk of contaminating recipient lakes, due to accumulation of pollutants. READ MORE