Sökning: "lake sediments"

Visar resultat 1 - 5 av 124 avhandlingar innehållade orden lake sediments.

  1. 1. Microcystis in lake sediments : its potential role in phosphorus exchange between sediment and lake water

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anna-Kristina Brunberg; Uppsala universitet.; [1993]

    Sammanfattning : .... LÄS MER

  2. 2. Lake sediments around the Antarctic Peninsula archives of climatic and environmental changes

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Rolf Zale; Umeå universitet.; [1993]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lake sediments; Antarctic Peninsula; radiocarbon dating; climatic and environmental changes; sediment chemistry; naturgeografi; Physical Geography;

    Sammanfattning : Lakes and lake sediments from four areas around the Antarctic Peninsula are described.The concentrations of trace metals in sediment are found to be a useful tool in distinguishing between the different sedimentary phases during a transition from marine to limnic environment. LÄS MER

  3. 3. Boreal Lake Sediments as Sources and Sinks of Carbon

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Cristian Gudasz; Uppsala universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; boreal lakes; allochthonous; lake sediments; sediment mineralization; bacterial production; bacterial biomass; carbon cycle; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Freshwater ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Limnisk ekologi; Limnologi; Limnology;

    Sammanfattning : Inland waters process large amounts of organic carbon, contributing to CO2 and CH4 emissions, as well as storing organic carbon (OC) over geological timescales. Recently, it has been shown that the magnitude of these processes is of global significance. LÄS MER

  4. 4. Vegetation history, human impact and palaeogeography of West Estonia : Pollen analytical studies of lake and bog sediments

    Detta är en avhandling från Uppsala : Societas Upsaliensis pro geologia quaternaria [Kvartärgeologiska fören.]

    Författare :Siim Veski; Uppsala universitet.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Vegetation history; human impact; palaeogeography; shoreline displacement; The Baltic Sea; the Yoldia Sea; the Ancylus Lake; the Litorina Sea; pollen analysis; macro fossil analysis; bog and lake sediments; radiocarbon dating; Holocene; Estonia; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys;

    Sammanfattning : The history of Holocene vegetation in western Estonia and the West Estonian Archipelago is described. Early Holocene sea level changes in the area are reconstructed, and human impact on the vegetation during the Late Holocene is discussedWest Estonia was divided into five study areas (Rummu-Maardu, Mustjärve, Velise-Kiilaspere, Tôstamaa Peninsula, and northern Saaremaa in the West Estonian Archipelago, from north to south). LÄS MER

  5. 5. Acidification trends in Swedish lakes an assessment of past water chemistry conditions using lake sediments

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Tom Korsman; Umeå universitet.; [1993]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palaeolimnology; acidification history; alkalization; acid deposition; land-use; lake sediments; near infrared spectroscopy; diatoms; multivariate calibration; Sweden;

    Sammanfattning : This thesis presents temporal perspectives of lake acidification in Sweden. Sediment records have been used to study timing, trends and causes of acidification, and two different techniques for assessing past lake-water acidity are presented. LÄS MER