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Sensitivity of volatile monoterpene emission to changes in canopy structure: a model-based exercise with a
1Research Center Karlsruhe GmbH, Institute for Meteorology and Climate Research (IMK-IFU), Kreuzeckbahnstr. 19, 82467 Garmisch-Partenkirchen, Germany.
The New Phytologist
|January 25, 2007
Summary
Forest canopy structure significantly influences monoterpene emissions. Leaf area and its distribution impact emissions similarly, highlighting the need for careful evaluation of structural indices for accurate scaling.
Area of Science:
- Biogeochemical Cycles
- Forest Ecology
- Atmospheric Chemistry
Background:
- Monoterpene emissions from forests are crucial for atmospheric chemistry and climate.
- Understanding the influence of canopy structure on these emissions is vital for accurate modeling.
Purpose of the Study:
- To investigate how total leaf area and leaf distribution in forest canopies affect monoterpene emissions.
- To compare two different monoterpene emission models (SIM-BIM2 and G93) regarding their sensitivity to canopy structure.
Main Methods:
- Simulations using hypothetical but realistic evergreen Quercus ilex (holm oak) canopies.
- Coupling of a canopy climate model (CANOAK) with a canopy model considering foliage variations.
- Application of two emission models: SIM-BIM2 (with cumulative responses) and G93 (without).
Main Results:
- Forest canopy structure significantly impacts monoterpene emissions.
- Sensitivities to total leaf area and leaf area distribution were of similar magnitude.
- Emission models showed similar yearly performance but differed during specific episodes.
Conclusions:
- Structural indices must be carefully evaluated for accurate scaling of monoterpene emissions from leaf to canopy.
- Further research on the seasonal dynamics of emission potentials is recommended.
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