Origin, composition, and flux of dissolved organic carbon in the Hubbard Brook Valley
- State Univ. of New York College, Oswego (USA)
- Institute of Ecosystem Studies, Millbrook, NY (USA)
The concentration, composition, and flux of dissolved organic carbon (DOC) were measured in the Hubbard Brook Valley, New Hampshire. Data on precipitation, throughfall, soil solution, streamside seeps, stream water, and lake water are presented for 1976-1980. Characterization of DOC included analysis of phenolics, monomeric and polymeric carbohydrates, carboxylic acids, primary amines, and aldehydes. DOC concentrations increased with passage of water through the forest canopy and forest floor, decreased due to abiotic sorption in the mineral soil, and remained relatively low in most downstream ecosystems (streamside seeps, streams, and Mirror Lake). Average flux of DOC is estimated as 17, 47, 263, 54, 23, and 20 kg{center dot}ha{sup {minus}1}{center dot}yr{sup {minus}1} in precipitation, throughfall, soil solution (E, upper B, and B horizons), and streamflow, respectively. The composition of DOC, in particular the relative proportions of carbohydrates, appears to be related to the degree of biological activity at a given site in the landscape. Carbohydrates are particularly high in both absolute and relative terms in throughfall and lake water, which are the areas of highest photosynthetic activity within the terrestrial and aquatic ecosystems, respectively.
- OSTI ID:
- 5076040
- Journal Information:
- Ecological Monographs; (USA), Vol. 58:3; ISSN 0012-9615
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AQUATIC ECOSYSTEMS
CARBON CYCLE
TERRESTRIAL ECOSYSTEMS
ALDEHYDES
AMINES
CARBOHYDRATES
DISSOLVED GASES
FORESTS
NEW HAMPSHIRE
ORGANIC ACIDS
PHENOLS
SOIL CHEMISTRY
THROUGHFALL
WATER CHEMISTRY
AROMATICS
CHEMISTRY
ECOSYSTEMS
FEDERAL REGION I
FLUIDS
GASES
HYDROXY COMPOUNDS
NORTH AMERICA
ORGANIC COMPOUNDS
SOLUTES
USA
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)