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Titel |
Differential stemflow generation due to crown structural interactions with wind-driven rainfall |
VerfasserIn |
John Van Stan, Courtney Siegert, Delphis Levia, Carrie Scheick |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250074544
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Zusammenfassung |
Meteorological influences on the variability of stemflow generation can affect the hydrology,
ecology and soil chemistry of wooded ecosystems, yet the effects of directional wind-driven
rainfall on differential stemflow production remain relatively un-researched. This
study examines the correspondence of directional wind-driven inclined rainfall with
stemflow generation in individual tree crowns utilizing multiple correspondence
analysis (MCA) and intrastorm observations at 5 min monitoring intervals. In general,
preferential stemflow generation at Fair Hill was observed during episodes of inclined
rainfall driven by wind from the east to north-northeast (33.76-101.25 deg.). This
was supported by MCAs which produced significant correspondences between
stemflow production and periods of inclined wind-driven rainfall for nearly all
monitored storm events. Intrastorm plots of stemflow production from dominant and
subcanopy trees of each codominant species (Fagus grandifolia Ehrh. (American beech)
and Liriodendron tulipifera L. (yellow poplar)) also verified this correspondence.
Interspecific canopy characteristics of L. tulipifera and F. grandifolia affected crown
position, canopy structural characteristics, and, thus, the canopy’s response to inclined
precipitation. The greater vertical canopy depth observed for F. grandifolia trees
enabled them to more efficiently capture inclined rainfall for enhanced stemflow
production; whereas, the greater horizontal surface area of L. tulipifera canopies enhanced
their droplet capture efficiency and subsequent stemflow generation for periods of
un-inclined rainfall. As inclined wind-driven rainfall occurred within a majority of rain
events at this site, preferential stemflow production may be a significant process to
consider when examining the spatial distribution of canopy-derived water fluxes to
the forest floor of wooded catchments under similar meteorological conditions. |
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