Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.5194/bg-10-905-2013 |
| Titel (primär) | Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements |
| Autor | Strohmeier, S.; Knorr, K.-H.; Reichert, M.; Frei, S.; Fleckenstein, J.H. |
| Quelle | Biogeosciences |
| Erscheinungsjahr | 2013 |
| Department | HDG |
| Band/Volume | 10 |
| Seite von | 905 |
| Seite bis | 916 |
| Sprache | englisch |
| UFZ Querschnittsthemen | RU2; |
| Abstract | Concentrations of dissolved organic carbon (DOC) in runoff from catchments are
often subject to substantial short-term variations. The aim of this study was to
identify the compartmental sources of DOC in a forested catchment and the causes
for short-term variations in runoff. Furthermore, we investigated the
implication of short-term variations for the calculation of annual runoff
fluxes. High frequency measurements (30 min intervals) of DOC in runoff, of
discharge and groundwater table were conducted for one year in the 4.2
km2 forested Lehstenbach catchment, Germany. Riparian wetland soils
represent about 30% of the catchment area. The quality of DOC was investigated
by three dimensional fluorescence excitation-emission matrices in samples taken
from runoff, deep groundwater and shallow groundwater from the riparian wetland
soils. The concentrations of DOC in runoff were highly variable at an hourly to
daily time scale, ranging from 2.6 mg L−1 to 34 mg L−1
with an annual average of 9.2 mg L−1. The concentrations were
positively related to discharge, with a counter clockwise hysteresis. Relations
of DOC to discharge were steeper and the degree of hysteresis larger in the
summer/fall than in the winter/spring period. Dynamics of groundwater table,
discharge, DOC concentrations and DOC quality parameters indicated that DOC in
runoff originated mainly from the riparian wetland soils, both under low and
high flow conditions. The annual export of DOC from the catchment was 84 kg C
ha−1 yr−1 when calculated from the high frequency
measurements. If the annual export was calculated by simulated samplings of
>2 days intervals substantial deviations resulted. Predicted changes in precipitation and discharge patterns as well as generally increasing temperatures likely will cause raising DOC exports from this catchment. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13502 |
| Strohmeier, S., Knorr, K.-H., Reichert, M., Frei, S., Fleckenstein, J.H. (2013): Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements Biogeosciences 10 , 905 - 916 10.5194/bg-10-905-2013 |
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