Uittreksel
Two canopy compensation point models were used to study the bidirectional exchange of ammonia over a mixed coniferous forest subjected to high nitrogen deposition. The models were tested for 16 time series, average fluxes of which ranged between -270 and +1 ngm-2s-1. The static model consisted of a bidirectional stomatal flux and a unidirectional cuticular flux component. The dynamic model also allowed for desorption of ammonia from the leaf surface and took into account ammonia fluxes from precedent periods. The apoplastic ammonium/hydrogen ion ratio (Γ), which was derived to estimate the stomatal compensation point (Χs), amounted to 3300 in spring and 1375 during the summer/autumn. Empirical descriptions for cuticular resistances (Rw) in the static model, developed as a function of micrometeorological conditions and codeposition effects, failed to reproduce the measured fluxes. A better match with measurements was obtained using the dynamic model, which succeeded in simulating net-emission during the daytime.
Oorspronkelijke taal | Engels |
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Tijdschrift | Environmental Pollution |
Volume | 154 |
Exemplaarnummer | 3 |
Pagina's (van-tot) | 424-438 |
Aantal pagina’s | 15 |
DOI's | |
Publicatiestatus | Gepubliceerd - 2008 |
Thematische lijst
- Milieu
EWI Biomedische wetenschappen
- B002-biofysica