Sökning: "Selective cutting"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Selective cutting.

  1. 1. Effects of forest management on greenhouse gas fluxes in a boreal forest

    Detta är en avhandling från Lund University, Faculty of Science, Department of Physical Geography and Ecosystem Science

    Författare :Patrik Vestin; [2017-08]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Forest management; Greenhouse gas fluxes; Clear-cutting; Thinning; Stump harvesting; Selective cutting; Eddy-covariance; Flux-gradient; Greenhouse gas budgets; CO2; CH4; N2O;

    Sammanfattning : Forest ecosystems cover 31% of the terrestrial land area and store large amounts of carbon in biomass and in soils. The 2015 Paris Agreement recognizes the importance of sinks and reservoirs of greenhouse gases (GHGs) in forests and the importance of enhancing them through sustainable forest management policies. LÄS MER

  2. 2. Boreal vegetation responses to forestry as reflected in field trial and survey data

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Johan Bergstedt; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Logging; boreal forest; selective cutting; scarification; ground-layer flora; survey data;

    Sammanfattning : This thesis had two objectives: the first objective was to evaluate the response of forest ground vegetation to selected forestry operations, i.e. cutting of different intensities and scarification; the second objective was to compare the use of survey data in vegetation research with that of more traditional research using field trials - i.e. LÄS MER

  3. 3. Trace analysis of polychlorinated dibenzo-p-dioxines, dibenzofurans and related compounds in environmental matrices

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Yngve Zebühr; [1992]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis sample extraction, clean up procedures and quantitative and qualitative analysis of polychlorinated dibenzo-p-dioxins, dibenzofurans and related compounds are discussed, as well as aspects on the sampling of some complex environmental matrices.The matrices are mostly from the aquatic environment but other samples are also dealt with, such as urban and remote air samples, samples from environments with heavy automobile traffic and samples from one municipal incinerator, waste water treatment plants etc. LÄS MER

  4. 4. Function and dynamics of woody debris in boreal forest streams

    Detta är en avhandling från Umeå : Umeå univ

    Författare :Niklas Dahlström; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi;

    Sammanfattning : The work in this thesis deals with (1) the effects of woody debris on stream channel morphology and retention of organic material, and (2) the dynamics of woody debris and its relation to riparian forest history and composition. The studied stream reaches are situated in mature, productive forests in the boreal zone of Sweden. LÄS MER

  5. 5. Function and dynamics of woody debris in boreal forest streams

    Detta är en avhandling från Umeå : Ekologi och geovetenskap

    Författare :Niklas Dahlström; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Boreal forest;  CPOM;  CWD;  forest management;  geomorphology;  LWD;  riparian forest;  retention;  residence time;  streams;  Sweden;  woody debris; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi;

    Sammanfattning : The work in this thesis deals with (1) the effects of woody debris on stream channel morphology and retention of organic material, and (2) the dynamics of woody debris and its relation to riparian forest history and composition. The studied stream reaches are situated in mature, productive forests in the boreal zone of Sweden. LÄS MER