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Dissolved organic carbon characteristics in boreal streams in a forest-wetland gradient during the transition between winter and summer

Ågren, Anneli; Buffam, Ishi; Berggren, Martin LU ; Bishop, Kevin; Jansson, Mats and Laudon, Hjalmar (2008) In Journal of Geophysical Research - Biogeosciences 113(G3). p.11-03031
Abstract
The character and quantity of dissolved organic carbon (DOC) were studied in nine small boreal streams and adjacent soils during two years, with focus on the spring snowmelt period. The streams cover a forest-wetland gradient, spanning from 0% to 69% wetland coverage. Lower values of the absorbance ratio measured at 254 nm and 365 nm (A(254)/A(365)), in both soil plots and streams, indicated that wetland-derived DOC had higher average molecular weight than forest DOC. Higher SUVA(254) ( DOC specific ultraviolet absorption at 254 nm) in wetland runoff indicated more aromatic DOC from wetlands than forests. During low flow, the stream DOC character was sensitive to the forest-wetland proportion of the catchment, and when wetland coverage... (More)
The character and quantity of dissolved organic carbon (DOC) were studied in nine small boreal streams and adjacent soils during two years, with focus on the spring snowmelt period. The streams cover a forest-wetland gradient, spanning from 0% to 69% wetland coverage. Lower values of the absorbance ratio measured at 254 nm and 365 nm (A(254)/A(365)), in both soil plots and streams, indicated that wetland-derived DOC had higher average molecular weight than forest DOC. Higher SUVA(254) ( DOC specific ultraviolet absorption at 254 nm) in wetland runoff indicated more aromatic DOC from wetlands than forests. During low flow, the stream DOC character was sensitive to the forest-wetland proportion of the catchment, and when wetland coverage exceeded 10%, the streams appeared to be dominated by wetland-derived DOC. During the spring snowmelt period, the character changed to lower molecular weight and more aliphatic DOC, particularly in streams with a high proportion of forest in the catchment. The forested soil solutions had higher A(254)/A(365) in the surface horizons that were hydrologically activated during the high flow events, while wetland soil solution had relatively low A(254)/A(365) at all depths. Consequently forest soils contributed more to stream DOC concentration during snowmelt that during winter low flow. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NORTHERN SWEDEN, CHEMICAL-COMPOSITION, PRECAMBRIAN SHIELD, BACTERIAL-GROWTH, SOIL FROST, LAKE WATER, MATTER, EXPORT, CATCHMENTS, RIVER
in
Journal of Geophysical Research - Biogeosciences
volume
113
issue
G3
pages
11 - 03031
publisher
American Geophysical Union
external identifiers
  • scopus:69649094091
ISSN
2169-8953
DOI
10.1029/2007JG000674
language
English
LU publication?
no
id
01f601d9-7382-4bd8-a852-09624f56bbe7 (old id 3055067)
date added to LUP
2012-11-27 15:59:28
date last changed
2017-09-10 03:45:53
@article{01f601d9-7382-4bd8-a852-09624f56bbe7,
  abstract     = {The character and quantity of dissolved organic carbon (DOC) were studied in nine small boreal streams and adjacent soils during two years, with focus on the spring snowmelt period. The streams cover a forest-wetland gradient, spanning from 0% to 69% wetland coverage. Lower values of the absorbance ratio measured at 254 nm and 365 nm (A(254)/A(365)), in both soil plots and streams, indicated that wetland-derived DOC had higher average molecular weight than forest DOC. Higher SUVA(254) ( DOC specific ultraviolet absorption at 254 nm) in wetland runoff indicated more aromatic DOC from wetlands than forests. During low flow, the stream DOC character was sensitive to the forest-wetland proportion of the catchment, and when wetland coverage exceeded 10%, the streams appeared to be dominated by wetland-derived DOC. During the spring snowmelt period, the character changed to lower molecular weight and more aliphatic DOC, particularly in streams with a high proportion of forest in the catchment. The forested soil solutions had higher A(254)/A(365) in the surface horizons that were hydrologically activated during the high flow events, while wetland soil solution had relatively low A(254)/A(365) at all depths. Consequently forest soils contributed more to stream DOC concentration during snowmelt that during winter low flow.},
  author       = {Ågren, Anneli and Buffam, Ishi and Berggren, Martin and Bishop, Kevin and Jansson, Mats and Laudon, Hjalmar},
  issn         = {2169-8953},
  keyword      = {NORTHERN SWEDEN,CHEMICAL-COMPOSITION,PRECAMBRIAN SHIELD,BACTERIAL-GROWTH,SOIL FROST,LAKE WATER,MATTER,EXPORT,CATCHMENTS,RIVER},
  language     = {eng},
  number       = {G3},
  pages        = {11--03031},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research - Biogeosciences},
  title        = {Dissolved organic carbon characteristics in boreal streams in a forest-wetland gradient during the transition between winter and summer},
  url          = {http://dx.doi.org/10.1029/2007JG000674},
  volume       = {113},
  year         = {2008},
}