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| Titel |
Scaling of increased dissolved organic carbon inputs by forest clear-cutting - What arrives downstream? |
| VerfasserIn |
Jakob Schelker, Karin Öhman, Stefan Löfgren, Hjalmar Laudon |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099284
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| Publikation (Nr.) |
 EGU/EGU2014-15047.pdf |
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| Zusammenfassung |
| Forest clear-cutting has been found to significantly increase concentrations of dissolved
organic carbon (DOC) in boreal first-order streams. Here, we address the questions of 1) how
the additional inputs of DOC by upstream forest harvesting affect downstream locations
within a stream network and 2) what catchment area has to be harvested to cause a significant
downstream increase in DOC concentration. We combined the use of primary data from a
paired-catchment experiment, clear-cut history of a nested stream network derived from
satellite images with a mixing-model approach in order to quantify the importance
of upstream clear-cuts on two downstream sites with different catchment sizes.
Modeled [DOC] agreed well with the measured concentrations in the smaller, 8.7 km2
catchment located above a larger wetland area, but discrepancies occurred for the
larger 22.9 km2 catchment located downstream of the wetland. Estimates of the
critical area (Acritical) needed to be harvested to cause a significant impact on
downstream DOC concentrations was quantified to be 11% for p |
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