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Titolo:
SOURCES AND FLOWPATHS OF DISSOLVED ORGANIC-CARBON DURING STORMS IN 2 FORESTED WATERSHEDS OF THE PRECAMBRIAN SHIELD
Autore:
HINTON MJ; SCHIFF SL; ENGLISH MC;
Indirizzi:
GEOL SURVEY CANADA,601 BOOTH ST OTTAWA ON K1A 0E8 CANADA UNIV WATERLOO,DEPT EARTH SCI WATERLOO ON N2L 3G1 CANADA WILFRID LAURIER UNIV,DEPT GEOG & ENVIRONM STUDIES WATERLOO ON N2L 3C5CANADA
Titolo Testata:
Biogeochemistry
fascicolo: 2, volume: 41, anno: 1998,
pagine: 175 - 197
SICI:
0168-2563(1998)41:2<175:SAFODO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOIL-WATER; GROUNDWATER; CATCHMENT; STREAM; DYNAMICS; MATTER;
Keywords:
CARBON CYCLING; DISSOLVED ORGANIC CARBON (DOC); FORESTED CATCHMENTS; NUTRIENT EXPORT; PRECAMBRIAN SHIELD STREAMS; STORM RUNOFF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Hinton et al., "SOURCES AND FLOWPATHS OF DISSOLVED ORGANIC-CARBON DURING STORMS IN 2 FORESTED WATERSHEDS OF THE PRECAMBRIAN SHIELD", Biogeochemistry, 41(2), 1998, pp. 175-197

Abstract

Dissolved organic carbon (DOG) concentrations and export were studiedin two small catchments in central Ontario to examine DOC sources andto assess the hypothesis that organic matter adjacent to the stream is a significant contributor of DOC during storms. Different DOC dynamics and exports were observed according to the depth of the riparian water table. In Harp 4-21, riparian flowpaths were predominantly throughA and upper B soil horizons and riparian soils contributed between 73and 84% of the stream DOC export during an autumn storm. In Harp 3A, riparian flowpaths were predominantly through lower B horizons. Consequently, riparian soils were less important and hillslopes contributed more than 50% of the stream DOC export in subcatchments without wetlands during storms. Wetlands and adjacent soils contributed significantly to DOC export in Harp 3A; 8% of the total catchment area exported 32to 46% of the storm runoff DOG. DOC export dynamics in wetlands and riparian soils were distinctly different. In wetlands, transport was affected by leaching and flushing of DOC at the wetland surface leading to lower DOC concentrations with successive storms. In riparian soils,groundwater flowpaths were more important and stronger positive relationships between discharge and DOC concentration were observed. Precipitation, throughfall and stemflow were minor sources of stream DOC during storms and contributed less than 20% of the total export.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:21:47