Spatial and temporal patterns of throughfall chemistry within a temperate mixed oak-beech stand

The Science of the Total Environment
Frédéric AndréQuentin Ponette

Abstract

The effects of meteorological variables and local canopy characteristics on throughfall chemistry were investigated within a mixed oak-beech stand during the leafed and the leafless seasons. Throughfall was collected after each rain event in 12 structural units delimited by three neighbouring trees each. For each investigated ion (H+, Mg2+, Ca2+, K+, NH4+, Na+, Cl(-), NO3(-) and SO4(2-)), mixed linear models were used to analyse the effects of the rain volume (R) and of the length of the preceding dry period (ADP) on net throughfall ion fluxes and to evaluate the influence of canopy density and tree species composition on these relationships. The models explained more than 70% of the total variability. Canopy characteristics accounted for most of the spatial variability while a large part of the temporal variability was not explained by R and ADP, suggesting an influence of other variables such as wind force and direction. For each season, net throughfall ion fluxes generally increased with increasing R and ADP, whose coefficients were interpreted as leaching capacity and dry deposition rate, respectively; H+ is an exception with negative exchange capacity (i.e. absorption) during the leafed season. Dry deposition rate and exch...Continue Reading

References

Jan 1, 1992·Environmental Pollution·G P DraaijersR Meijers
Sep 26, 2006·Ecology·Mathieu JonardQuentin Ponette

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Citations

Jun 10, 2015·Journal of Environmental Radioactivity·Nicolas LoffredoFrédéric Coppin
Sep 22, 2012·The Science of the Total Environment·G BrecciaroliG Corti

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