Sökning: "wetland deposition"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden wetland deposition.

  1. 1. Skapa plats i landskapet : tidig- och mellanneolitiska samhällen utmed två västskånska dalgångar

    Författare :Magnus Andersson; Lunds universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Battle Axe Culture; central place; grave; settlement; wetland deposition; society; landscape space; social organisation; place; space; time; landscape; Scania; Neolithic; Funnel Beaker Culture; Pitted Ware Culture; Stävie group; Archaeology; Arkeologi;

    Sammanfattning : This dissertation deals with Early and Middle Neolithic societies in a valley landscape in western Scania, in the southern part of Sweden. Several archaeological excavations conducted by the National Heritage Board have revealed a great number of Neolithic remains in this region. LÄS MER

  3. 2. Radionuclide transport in the boreal landscape : Uranium, thorium and other metals in forests, wetlands and streams

    Författare :Fredrik Lidman; Hjalmar Laudon; Köhler Stephan; Oleg Pokrovsky; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; uranium thorium metal transport radionuclide wetland forest stream peat mire; naturgeografi; Physical Geography;

    Sammanfattning : The boreal landscape is complex mosaic of vast forests, lakes and wetlands. Through the landscape flows a fine network of streams and rivers, carrying dissolved and suspended material from atmospheric deposition and weathering of soils and bedrock to downstream recipients. LÄS MER

  4. 3. Landscape hydrogeochemistry of Fe, Mn, S and trace elements (As, Co, Pb) in a boreal stream network

    Författare :Louise Björkvald; Carl-Magnus Mörth; Hjalmar Laudon; Christine Alewell; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; landscape hydrogeochemistry; boreal streams; spring flood; Fe; Mn; S; As; Co; Pb; sulphur isotopes; sulphate; organic S; DOC; spatial variability; temporal variability; wetlands; Earth sciences; Geovetenskap; geokemi; Geochemistry;

    Sammanfattning : The transport of elements by streams from headwater regions to the sea is influenced by landscape characteristics. This thesis focuses on the influence of landscape characteristics (e.g. LÄS MER

  5. 4. Small wetlands designed for phosphorus retention in Swedish agricultural areas : efficiency variations during the first years after construction

    Författare :Pia Geranmayeh; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis examined retention of particles and phosphorus (P) losses from agricultural clay soils in small wetlands with an initial deep area followed by a shallow area with emergent plants. Two long, narrow wetlands (Bergaholm and Nybble) specially designed for P retention (P-wetlands) were constructed, and their efficiency in sediment accumulation were compared with those of six existing wetlands with a different design. LÄS MER

  7. 5. Environmental influence on Hg and 137Cs levels in perch (Perca fluviatilis L.) and roach (Rutilus rutilus L.) from circumneutral lakes

    Författare :Lars Sonesten; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Hg; 137Cs; fish; PLS; land use; cations; humic substances; circumneutral; Biologi; Biology; Biologi; limnologi; Limnology;

    Sammanfattning : Mercury and radioactive caesium have received immense attention in Sweden during the past decades, as common contaminants in fish. This thesis examines how the Hg and 137Cs levels in fish from 79 circumneutral lakes are affected by various environmental factors. LÄS MER