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| Titel |
Particulate matter fluxes in throughfall and stemflow under oak and pine
stands |
| VerfasserIn |
Carles Cayuela, Delphis Levia, Elisenda Sánchez-Costa, Jérôme latron, Pilar Llorens |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148759
|
| Publikation (Nr.) |
 EGU/EGU2017-13046.pdf |
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| Zusammenfassung |
| The atmospheric particulate deposition (APD) is one source of nutrients for forest
ecosystems. Forest canopies offer large deposition surfaces that can enhance the amount of
particles reaching the soil as throughfall or as stemflow. However, the influence of the forest
canopy on APD is still poorly known. In this study, we aim to compare the fluxes of APD
reaching the soil in an open field and below the canopy (via throughfall and stemflow) in
Pinus sylvestris L. (Scots pine) and Quercus pubescens Willd. (downy oak) stands located in
the Vallcebre research catchments (NE Spain, 42o 12’N, 1o 49’E). After every rainfall,
samples of each water flux were collected and filtered (0.45 μm pore size cellulose filters) to
determine the particulate matter fluxes. In addition, filters corresponding to 7 rainfall events
were selected to analyse the morphometric characteristics of particulates using a confocal
microscopy. The APD annual rates were: 66 kg ha−1 year−1 in the open field, 82 kg ha−1
year−1in throughfall for both species and 2.8 and 1.2 kg ha−1 year−1in stemflow
for pines and oaks respectively. At the event scale, APD in throughfall increased
with increasing rainfall volume and in stemflow with increasing funnelling ratio.
The flux of particulate matter in throughfall was strongly linked with the presence
or absence of foliage; being higher for oaks during the dormant season. On the
other hand, rainfall intensity and the time lag between rainfalls were important
factors determining the number of particles below the canopy. These results show
the importance of throughfall and stemflow regarding to the transfer of particulate
matter to the soil. Despite APD in stemflow per surface area was small, this flux
represents a hotspot of particulate matter that reaches the base of the trunks, and
is therefore of special interest to understand forest soils biogeochemical cycles. |
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