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Variability in runoff fluxes of dissolved and particulate carbon and nitrogen from two watersheds of different tree species during intense storm events

Title
Variability in runoff fluxes of dissolved and particulate carbon and nitrogen from two watersheds of different tree species during intense storm events
Authors
Lee, Mi-HeePayeur-Poirier, Jean-LionelPark, Ji-HyungMatzner, Egbert
Ewha Authors
박지형
SCOPUS Author ID
박지형scopus
Issue Date
2016
Journal Title
BIOGEOSCIENCES
ISSN
1726-4170JCR Link1726-4189JCR Link
Citation
vol. 13, no. 18, pp. 5421 - 5432
Publisher
COPERNICUS GESELLSCHAFT MBH
Indexed
SCIE; SCOPUS WOS scopus
Abstract
Heavy storm events may increase the amount of organic matter in runoff from forested watersheds as well as the relation of dissolved to particulate organic matter. This study evaluated the effects of monsoon storm events on the runoff fluxes and on the composition of dissolved (<0.45 mu m) and particulate (0.7 mu m to 1 mm) organic carbon and nitrogen (DOC, DON, POC, PON) in a mixed coniferous/deciduous (mixed watershed) and a deciduous forested watershed (deciduous watershed) in South Korea. During storm events, DOC concentrations in runoff increased with discharge, while DON concentrations remained almost constant. DOC, DON and NO3-N fluxes in runoff increased linearly with discharge pointing to changing flow paths from deeper to upper soil layers at high discharge, whereas nonlinear responses of POC and PON fluxes were observed likely due to the origin of particulate matter from the erosion of mineral soil along the stream benches. The integrated C and N fluxes in runoff over the 2-month study period were in the order of DOC>POC and NO3-N > DON > PON. The integrated DOC fluxes in runoff during the study period were much larger at the deciduous watershed (16 kg Cha(-1) / than at the mixed watershed (7 kg C ha(-1) /, while the integrated NO3-N fluxes were higher at the mixed watershed (5.2 kg N ha(-1) / than at the deciduous watershed (2.9 kg N ha(-1) /. The latter suggests a larger N uptake by deciduous trees. Integrated fluxes of POC and PON were similar at both watersheds. The composition of organic matter in soils and runoff indicates that the contribution of near-surface flow to runoff was larger at the deciduous than at the mixed watershed. Our results demonstrate different responses of particulate and dissolved C and N in runoff to storm events as a combined effect of tree species composition and watershed specific flow paths.
DOI
10.5194/bg-13-5421-2016
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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