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| Titel |
Organic carbon efflux from a deciduous forest catchment in Korea |
| VerfasserIn |
S. J. Kim, J. Kim, K. Kim |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 4 ; Nr. 7, no. 4 (2010-04-28), S.1323-1334 |
| Datensatznummer |
250004670
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| Publikation (Nr.) |
 copernicus.org/bg-7-1323-2010.pdf |
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| Zusammenfassung |
| Soil infiltration and surface discharge of precipitation are critical
processes that affect the efflux of Dissolved Organic Carbon (DOC) and
Particulate Organic Carbon (POC) in forested catchments. Concentrations of
DOC and POC can be very high in the soil surface in most forest ecosystems
and their efflux may not be negligible particularly under the monsoon
climate. In East Asia, however, there are little data available to evaluate
the role of such processes in forest carbon budget. In this paper, we
address two basic questions: (1) how does stream discharge respond to storm
events in a forest catchment? and (2) how much DOC and POC are exported from
the catchment particularly during the summer monsoon period? To answer these
questions, we collected hydrological data (e.g., precipitation, soil
moisture, runoff discharge, groundwater level) and conducted hydrochemical
analyses (including DOC, POC, and six tracers) in a deciduous forest
catchment in Gwangneung National Arboretum in west-central Korea. Based on
the end-member mixing analysis of the six storm events during the summer
monsoon in 2005, the surface discharge was estimated as 30 to 80% of the
total runoff discharge. The stream discharge responded to precipitation
within 12 h during these storm events. The annual efflux of DOC and POC from
the catchment was estimated as 0.04 and 0.05 t C ha−1 yr−1,
respectively. Approximately 70% of the annual organic carbon efflux
occurred during the summer monsoon period. Overall, the annual efflux of
organic carbon was estimated to be about 10% of the Net Ecosystem carbon
Exchange (NEE) obtained by eddy covariance measurement at the same site.
Considering the current trends of increasing intensity and amount of summer
rainfall and the large interannual variability in NEE, ignoring the organic
carbon efflux from forest catchments would result in an inaccurate
estimation of the carbon sink strength of forest ecosystems in the monsoon
East Asia. |
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