Sökning: "hemispherical photographs"

Hittade 4 uppsatser innehållade orden hemispherical photographs.

  1. 1. Seasonal variation of LAI in Swedish coniferous forest

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Ilia Mastepanov; [2023]
    Nyckelord :leaf area index; LAI; PAR; forest; coniferous forest; Hyltemossa; Earth and Environmental Sciences;

    Sammanfattning : Leaf Area Index (LAI) is quantity representing the amount of foliage in the canopy, which makes it an important parameter for analysing terrestrial ecosystems. Traditional methods of measuring LAI were done by analysing hemispherical photographs by hand and were very time consuming, requiring specific weather conditions (Jonckheere et al. 2004). LÄS MER

  3. 2. Natural oak regeneration in response to selective cutting : restoration of temperate deciduous woodlands on abandoned agricultural land in Scandinavia

    Master-uppsats, SLU/Southern Swedish Forest Research Centre

    Författare :Samuel Keith; [2020]
    Nyckelord :Light demanding species; selective cutting; restoration; ecosystem services; broadleaf dominated;

    Sammanfattning : The natural regeneration of sessile oak (Quercus petraea (Matt.) L.) and pedunculate oak (Quercus robur L.) is largely uncertain across central Europe and Scandinavia. LÄS MER

  4. 3. Restoration of degraded tropical rainforests through gap and line planting : effects on soil and light conditions and seedling performance

    Master-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Lukas Holmström; [2016]
    Nyckelord :enrichment planting; seedling survival; seedling height; dipterocarp; light; stödplantering; plantprestanda; överlevnad; höjd; dipterocarp; ljuskvantitet;

    Sammanfattning : Enrichment plantings are a common way to restore structures and diversity lost through degradation of tropical rainforests. Large areas are degraded every year, and although disturbance over large areas seldom are homogenous, few, if any studies have compared effects of enrichment planting treatments in forests with varying degradation. LÄS MER

  5. 4. Rehabilitation in a tropical secondary rain forest in Malaysian Borneo : early effects of canopy properties on light conditions at the forest floor

    Master-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Joakim Jansson; [2015]
    Nyckelord :tropisk sekundär regnskog; Dipterocarpaceae; krontäckning; ljus; densiometer; luckor; hemisfäriska foton; tropical secondary rainforest; openness; canopy; light; gaps; visible sky; hemispherical photographs; Crown Illumination Index; densiometer;

    Sammanfattning : Tropisk regnskog i Sydostasien är ett av de områden som hyser störst biodiversitet i världen, av vilken stora ytor är hotat. Ön Borneo drabbades av en katastrof åren 1982-1983 efter att väderfenomenet El Niño orsakat torka med vidsträckta skogsbränder som följd. LÄS MER