Sökning: "soil disturbance"

Visar resultat 1 - 5 av 32 avhandlingar innehållade orden soil disturbance.

  1. 1. Soil salinity as a driver of microbial community structure and functioning

    Detta är en avhandling från Lund University, Faculty of Science, Centre for Environmental and Climate Research (CEC)

    Författare :Kristin Rath; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2017-12]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Soil salinization; Soil Microbiology; soil microbial community; Bacteria; Aerobic; Fungi; Drying-rewetting; Microbial growth; Microbial biomass; Soil respiration; salinity tolerance; Saline soils; Salinity gradient;

    Sammanfattning : Soil salinization is a pressing agricultural problem in many areas of the world, particularly in areas heavily reliant on irrigation agriculture. While the negative effects of salinity on crop plants have been widely studied, its effects on soil microorganisms have received less attention, and the impact of soil salinity on both microbial community structure and functioning is not well understood. LÄS MER

  2. 2. Nitrogen in soil water of coniferous forests

    Detta är en avhandling från Lund University, Faculty of Science, Centre for Environmental and Climate Research (CEC)

    Författare :Martin Rappe George; Sveriges lantbruksuniversitet.; [2016]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : In boreal and temperate forests, long-term elevated nitrogen (N) load may eventually saturate forest ecosystems with N, i.e. total N ecosystem input exceed ecosystem sinks for N, and N losses via soil water transport may then increase and negatively impact environmental quality. LÄS MER

  3. 3. The influence of soil pH on plant and microbial communities in sandy grasslands

    Detta är en avhandling från Lund University, Faculty of Science, Centre for Environmental and Climate Research (CEC)

    Författare :Linda-Maria Mårtensson; Lund University.; Lunds universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; in situ 13CO2 labelling; disturbance; sandy grasslands; species diversity; acidification; soil pH; microbial biomass; C allocation;

    Sammanfattning : Sandy, calcareous grasslands are species rich temperate semi-natural grasslands. The species composition in 136 plots was analysed in relation to soil chemistry parameters; extractable P and N, soil pH and lime content. LÄS MER

  4. 4. Tillage effects on soil respiration in Swedish arable soils

    Detta är en avhandling från Lund University, Faculty of Science, Centre for Environmental and Climate Research (CEC)

    Författare :Veera Kainiemi; Sveriges lantbruksuniversitet.; [2014]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : The amount of carbon (C) present in soil is greater than the sum of C present in terrestrial vegetation and the atmosphere combined. Small changes in soils can therefore affect atmospheric CO₂ levels and ultimately the global climate. Soil C is also one of the main soil properties involved in several soil functions critical for soil productivity. LÄS MER

  5. 5. Disturbance regimes in dry sandy grasslands – past, present and future

    Detta är en avhandling från Centre for Environmental and Climate Research, Lund University

    Författare :Anja Ödman; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Grassland conservation; sand steppe; land use history; conceptual model; soil disturbance; lime; nutrient availability; vascular plants; bryophytes; ground beetles; propagule supply;

    Sammanfattning : A number of sandy grassland habitats of interest for biodiversity conservation can be found in Europe. One such habitat is the threatened xeric sand calcareous grassland, which is home to a large number of endangered species. LÄS MER