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Effects of tree pollen on throughfall element fluxes in European forests.

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Title: Effects of tree pollen on throughfall element fluxes in European forests.
Authors: Verstraeten, Arne1 (AUTHOR) arne.verstraeten@inbo.be, Bruffaerts, Nicolas2 (AUTHOR), Cristofolini, Fabiana3 (AUTHOR), Vanguelova, Elena4 (AUTHOR), Neirynck, Johan1 (AUTHOR), Genouw, Gerrit1 (AUTHOR), De Vos, Bruno1 (AUTHOR), Waldner, Peter5 (AUTHOR), Thimonier, Anne5 (AUTHOR), Nussbaumer, Anita5 (AUTHOR), Neumann, Mathias6 (AUTHOR), Benham, Sue4 (AUTHOR), Rautio, Pasi7 (AUTHOR), Ukonmaanaho, Liisa8 (AUTHOR), Merilä, Päivi8 (AUTHOR), Lindroos, Antti-Jussi8 (AUTHOR), Saarto, Annika9 (AUTHOR), Reiniharju, Jukka9 (AUTHOR), Clarke, Nicholas10 (AUTHOR), Timmermann, Volkmar10 (AUTHOR)
Source: Biogeochemistry. Sep2023, Vol. 165 Issue 3, p311-325. 15p.
Subjects: Pollen, Throughfall, Precipitation (Chemistry), Nutrient cycles, Beech
Abstract: The effects of tree pollen on precipitation chemistry are not fully understood and this can lead to misinterpretations of element deposition in European forests. We investigated the relationship between forest throughfall (TF) element fluxes and the Seasonal Pollen Integral (SPIn) using linear mixed-effects modelling (LME). TF was measured in 1990–2018 during the main pollen season (MPS, arbitrary two months) in 61 managed, mostly pure, even-aged Fagus, Quercus, Pinus, and Picea stands which are part of the ICP Forests Level II network. The SPIn for the dominant tree genus was observed at 56 aerobiological monitoring stations in nearby cities. The net contribution of pollen was estimated as the TF flux in the MPS minus the fluxes in the preceding and succeeding months. In stands of Fagus and Picea, two genera that do not form large amounts of flowers every year, TF fluxes of potassium (K+), ammonium-nitrogen (NH4+-N), dissolved organic carbon (DOC), and dissolved organic nitrogen (DON) showed a positive relationship with SPIn. However- for Fagus- a negative relationship was found between TF nitrate-nitrogen (NO3−-N) fluxes and SPIn. For Quercus and Pinus, two genera producing many flowers each year, SPIn displayed limited variability and no clear association with TF element fluxes. Overall, pollen contributed on average 4.1–10.6% of the annual TF fluxes of K+ > DOC > DON > NH4+-N with the highest contribution in Quercus > Fagus > Pinus > Picea stands. Tree pollen appears to affect TF inorganic nitrogen fluxes both qualitatively and quantitatively, acting as a source of NH4+-N and a sink of NO3−-N. Pollen appears to play a more complex role in nutrient cycling than previously thought. [ABSTRACT FROM AUTHOR]
Copyright of Biogeochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Effects of tree pollen on throughfall element fluxes in European forests.
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  Data: <searchLink fieldCode="AR" term="%22Verstraeten%2C+Arne%22">Verstraeten, Arne</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> arne.verstraeten@inbo.be</i><br /><searchLink fieldCode="AR" term="%22Bruffaerts%2C+Nicolas%22">Bruffaerts, Nicolas</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cristofolini%2C+Fabiana%22">Cristofolini, Fabiana</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vanguelova%2C+Elena%22">Vanguelova, Elena</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Neirynck%2C+Johan%22">Neirynck, Johan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Genouw%2C+Gerrit%22">Genouw, Gerrit</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22De+Vos%2C+Bruno%22">De Vos, Bruno</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Waldner%2C+Peter%22">Waldner, Peter</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thimonier%2C+Anne%22">Thimonier, Anne</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nussbaumer%2C+Anita%22">Nussbaumer, Anita</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Neumann%2C+Mathias%22">Neumann, Mathias</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Benham%2C+Sue%22">Benham, Sue</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rautio%2C+Pasi%22">Rautio, Pasi</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ukonmaanaho%2C+Liisa%22">Ukonmaanaho, Liisa</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Merilä%2C+Päivi%22">Merilä, Päivi</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lindroos%2C+Antti-Jussi%22">Lindroos, Antti-Jussi</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Saarto%2C+Annika%22">Saarto, Annika</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reiniharju%2C+Jukka%22">Reiniharju, Jukka</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Clarke%2C+Nicholas%22">Clarke, Nicholas</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Timmermann%2C+Volkmar%22">Timmermann, Volkmar</searchLink><relatesTo>10</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Biogeochemistry%22">Biogeochemistry</searchLink>. Sep2023, Vol. 165 Issue 3, p311-325. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Pollen%22">Pollen</searchLink><br /><searchLink fieldCode="DE" term="%22Throughfall%22">Throughfall</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Nutrient+cycles%22">Nutrient cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Beech%22">Beech</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The effects of tree pollen on precipitation chemistry are not fully understood and this can lead to misinterpretations of element deposition in European forests. We investigated the relationship between forest throughfall (TF) element fluxes and the Seasonal Pollen Integral (SPIn) using linear mixed-effects modelling (LME). TF was measured in 1990–2018 during the main pollen season (MPS, arbitrary two months) in 61 managed, mostly pure, even-aged Fagus, Quercus, Pinus, and Picea stands which are part of the ICP Forests Level II network. The SPIn for the dominant tree genus was observed at 56 aerobiological monitoring stations in nearby cities. The net contribution of pollen was estimated as the TF flux in the MPS minus the fluxes in the preceding and succeeding months. In stands of Fagus and Picea, two genera that do not form large amounts of flowers every year, TF fluxes of potassium (K+), ammonium-nitrogen (NH4+-N), dissolved organic carbon (DOC), and dissolved organic nitrogen (DON) showed a positive relationship with SPIn. However- for Fagus- a negative relationship was found between TF nitrate-nitrogen (NO3−-N) fluxes and SPIn. For Quercus and Pinus, two genera producing many flowers each year, SPIn displayed limited variability and no clear association with TF element fluxes. Overall, pollen contributed on average 4.1–10.6% of the annual TF fluxes of K+ > DOC > DON > NH4+-N with the highest contribution in Quercus > Fagus > Pinus > Picea stands. Tree pollen appears to affect TF inorganic nitrogen fluxes both qualitatively and quantitatively, acting as a source of NH4+-N and a sink of NO3−-N. Pollen appears to play a more complex role in nutrient cycling than previously thought. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Biogeochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10533-023-01082-3
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        Text: English
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