Abstract
Accurate quantification of total nitrogen and acidifying deposition is a major source of uncertainty in determining the exceedance of critical loads in forest ecosystems. Monitoring of atmospheric deposition is frequently based on throughfall measurements in combination with the canopy budget model to calculate ion-exchange fluxes between the forest canopy and incident rainfall water. Various approaches for each step in the canopy budget model have been reported and compared, but combinations of different approaches were not yet assessed. Therefore, the present study quantified the range of estimated dry deposition and total deposition resulting from all possible combinations of canopy budget model approaches for three typical case studies: (i) total nitrogen and potentially acidifying deposition onto a forest canopy, (ii) the ratio of these deposition variables between adjacent coniferous and deciduous stands and (iii) the parameters of a deposition time trend analysis. The time step, type of precipitation data and tracer ion used in the model had a significant effect on the findings in the three case studies. In addition, including or excluding canopy leaching of weak acids and canopy uptake of nitrogen during the leafless season largely affected the results, while including or excluding canopy uptake of nitrate generally showed no effect. In general, the use of wet-only precipitation data can be recommended, along with sodium as a tracer ion and the inclusion of weak acids. We conclude that further research should focus on the assumptions of inertness of the tracer ion and the equal deposition efficiency of base cations and the tracer ion and on the quantification of weak acids in rainfall and throughfall water. Since local or tree-species specific effects might influence the results obtained in this study, a similar analysis is recommended for other tree species and regions when using the canopy budget model.
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Acknowledgments
We gratefully acknowledge L. Willems, G. De bruyn and K. Ceunen for field and laboratory assistance. The first and second authors are granted by a research project (G.0205.08 N) and a postdoctoral fellowship, respectively, of the Research Foundation - Flanders (FWO). The third author is funded as a postdoctoral fellow of the Special Research Fund of Ghent University (BOF).
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Adriaenssens, S., Staelens, J., Baeten, L. et al. Influence of canopy budget model approaches on atmospheric deposition estimates to forests. Biogeochemistry 116, 215–229 (2013). https://doi.org/10.1007/s10533-013-9846-0
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DOI: https://doi.org/10.1007/s10533-013-9846-0