V7 Flashcards
Ecological climatology:
Ecoclimatological perspective:
Land surface models:
Which radiative fluxes do we find in plant stands?
Where in a plant stand is the radiation balance greatest?
- temperature, evapotranspiration
- regional climate, water balance latent heat flux sensible heat flux plant heat flux
- understanding the radiation balance
- deriving all other parameters
Radiation and leaves:
„Light extinction“
Radiation and thinning:
Radiation and canopy:
Radiation and leaves:
Diurnal course of PAR at 4 measuring points of a sun branch of Picea abie:
Radiation and canopy:
Strahlung an Waldränder:
- outer fringe: “darkened” with influence from the stand
- inner fringe: “brightened” with influence from the open field
- contrasts greater in full sunshine than in overcast conditions
- exposure of forest edge important
Radiation at forest edges:
- important, because of special microclimate
- favorable for natural regeneration and crops (protection against wind, temperature extremes)
- forest edge = transitional climate
Radiation in gaps:
Variability of shortwave radiation fluxes:
- very high spatial (horizontal and vertical) and temporal variability due to uneven structure of the canopy ⇒ light and shadow spots (sunflecks and shaded areas)
- depending on stand treatment (clear-cutting, different canopy positions (degree of canopy cover), strong - weak thinning (basal area), control as well as cloud cover)
- differences with slope inclination and direction, exposure
Objectives:
- Quantitative and qualitative investigation of short-wave ecologically and actinically relevant radiation fluxes in forests
- Development of a radiative transfer model for forest stands
- Input for flux-based ozone risk assessment model
- Input for forest growth model (BALANCE)
- Input for hydrological model (WaSiM)
- Mapping of phenology
- Spectral data for remote sensing ⇒ ground truth
Spektrale Strahlungsverteilung im Waldbestand:
- vertical distribution of PAR
Sunflecks:
- vertical distribution of sunflecks, penumbra and umbra
Spectral radiation distribution in the forest stand:
- probability density functions
Spectral radiation distribution in the forest stand:
- relationship between light quality and availability (quantity)
- PAR and R/FR
Strahlung und Sonnenhöhe:
- solar elevation and cloudiness
Radiation and structure:
- spectral ratios and structure
Radiation and structure:
- LAI and R/FR
Radiation and leaf size:
Modeling radiative transport in forest stands:
Phenological stages:
Phenological stages:
Ozone risk assessment:
Growth modeling ⇒ carbon budget:
Ozone risk assessment:
Radiation and photosynthesis:
