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Patterns and dynamics of dissolved organic carbon (DOC) in boreal streams: The role of processes, connectivity, and scaling

Laudon, Hjalmar; Berggren, Martin LU ; Ågren, Anneli; Buffam, Ishi; Bishop, Kevin; Grabs, Thomas; Jansson, Mats and Köhler, Stephan (2011) In Ecosystems 14(6). p.880-893
Abstract (Swedish)
Abstract in Undetermined

We bring together three decades of research from a boreal catchment to facilitate an improved mechanistic understanding of surface water dissolved organic carbon (DOC) regulation across multiple scales. The Krycklan Catchment Study encompasses 15 monitored nested research catchments, ranging from 3 to 6900 ha in size, as well as a set of monitored transects of forested and wetland soils. We show that in small homogenous catchments, hydrological functioning provides a first order control on the temporal variability of stream water DOC. In larger, more heterogeneous catchments, stream water DOC dynamics are regulated by the combined effect of hydrological mechanisms and the proportion of major... (More)
Abstract in Undetermined

We bring together three decades of research from a boreal catchment to facilitate an improved mechanistic understanding of surface water dissolved organic carbon (DOC) regulation across multiple scales. The Krycklan Catchment Study encompasses 15 monitored nested research catchments, ranging from 3 to 6900 ha in size, as well as a set of monitored transects of forested and wetland soils. We show that in small homogenous catchments, hydrological functioning provides a first order control on the temporal variability of stream water DOC. In larger, more heterogeneous catchments, stream water DOC dynamics are regulated by the combined effect of hydrological mechanisms and the proportion of major landscape elements, such as wetland and forested areas. As a consequence, streams with heterogeneous catchments undergo a temporal switch in the DOC source. In a typical boreal catchment covered by 10-20% wetlands, DOC originates predominantly from wetland sources during low flow conditions. During high flow, the major source of DOC is from forested areas of the catchment. We demonstrate that by connecting knowledge about DOC sources in the landscape with detailed hydrological process understanding, an improved representation of stream water DOC regulation can be provided. The purpose of this study is to serve as a framework for appreciating the role of regulating mechanisms, connectivity and scaling for understanding the pattern and dynamics of surface water DOC across complex landscapes. The results from this study suggest that the sensitivity of stream water DOC in the boreal landscape ultimately depends on changes within individual landscape elements, the proportion and connectivity of these affected landscape elements, and how these changes are propagated downstream. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dissolved organic carbon, scaling, connectivity, boreal forest, Krycklan catchment, hydrology
in
Ecosystems
volume
14
issue
6
pages
880 - 893
publisher
Springer
external identifiers
  • scopus:80052489380
ISSN
1432-9840
DOI
10.1007/s10021-011-9452-8
language
English
LU publication?
no
id
eb387c53-c03d-423f-906c-ee355843fca4 (old id 2225861)
date added to LUP
2011-12-16 14:03:44
date last changed
2017-11-12 03:38:35
@article{eb387c53-c03d-423f-906c-ee355843fca4,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
We bring together three decades of research from a boreal catchment to facilitate an improved mechanistic understanding of surface water dissolved organic carbon (DOC) regulation across multiple scales. The Krycklan Catchment Study encompasses 15 monitored nested research catchments, ranging from 3 to 6900 ha in size, as well as a set of monitored transects of forested and wetland soils. We show that in small homogenous catchments, hydrological functioning provides a first order control on the temporal variability of stream water DOC. In larger, more heterogeneous catchments, stream water DOC dynamics are regulated by the combined effect of hydrological mechanisms and the proportion of major landscape elements, such as wetland and forested areas. As a consequence, streams with heterogeneous catchments undergo a temporal switch in the DOC source. In a typical boreal catchment covered by 10-20% wetlands, DOC originates predominantly from wetland sources during low flow conditions. During high flow, the major source of DOC is from forested areas of the catchment. We demonstrate that by connecting knowledge about DOC sources in the landscape with detailed hydrological process understanding, an improved representation of stream water DOC regulation can be provided. The purpose of this study is to serve as a framework for appreciating the role of regulating mechanisms, connectivity and scaling for understanding the pattern and dynamics of surface water DOC across complex landscapes. The results from this study suggest that the sensitivity of stream water DOC in the boreal landscape ultimately depends on changes within individual landscape elements, the proportion and connectivity of these affected landscape elements, and how these changes are propagated downstream.},
  author       = {Laudon, Hjalmar and Berggren, Martin and Ågren, Anneli and Buffam, Ishi and Bishop, Kevin and Grabs, Thomas and Jansson, Mats and Köhler, Stephan},
  issn         = {1432-9840},
  keyword      = {dissolved organic carbon,scaling,connectivity,boreal forest,Krycklan catchment,hydrology},
  language     = {eng},
  number       = {6},
  pages        = {880--893},
  publisher    = {Springer},
  series       = {Ecosystems},
  title        = {Patterns and dynamics of dissolved organic carbon (DOC) in boreal streams: The role of processes, connectivity, and scaling},
  url          = {http://dx.doi.org/10.1007/s10021-011-9452-8},
  volume       = {14},
  year         = {2011},
}