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Dissolved organic carbon in streams within a subarctic catchment analysed using a GIS/remote sensing approach

Author:
  • Pearl MZOBE
  • Martin Berggren
  • Petter Pilesjö
  • Erik Lundin
  • David Olefeldt
  • Nigel T. Roulet
  • Andreas Persson
Publishing year: 2018-07-06
Language: English
Pages:
Publication/Series: PLoS ONE
Volume: 13
Issue: 7
Document type: Journal article
Publisher: Public Library of Science

Abstract english

Climate change projections show that temperature and precipitation increases can alter the exchange of greenhouse gases between the atmosphere and high latitude landscapes, including their freshwaters. Dissolved organic carbon (DOC) plays an important role in greenhouse gas emissions, but the impact of catchment productivity on DOC release to subarctic waters remains poorly known, especially at regional scales. We test the hypothesis that increased terrestrial productivity, as indicated by the normalized difference vegetation index (NDVI), generates higher stream DOC concentrations in the Stordalen catchment in subarctic Sweden. Furthermore, we aimed to determine the degree to which other generic catchment properties (elevation, slope) explain DOC concentration, and whether or not land cover variables representing the local vegetation type (e.g., mire, forest) need to be included to obtain adequate predictive models for DOC delivered into rivers. We show that the land cover type, especially the proportion of mire, played a dominant role in the catchment’s release of DOC, while NDVI, slope, and elevation were supporting predictor variables. The NDVI as a single predictor showed weak and inconsistent relationships to DOC concentrations in recipient waters, yet NDVI was a significant positive regulator of DOC in multiple regression models that included land cover variables. Our study illustrates that vegetation type exerts primary control in DOC regulation in Stordalen, while productivity (NDVI) is of secondary importance. Thus, predictive multiple linear regression models for DOC can be utilized combining these different types of explanatory variables.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 1932-6203
E-mail: andreas [dot] persson [at] nateko [dot] lu [dot] se

Senior lecturer

Dept of Physical Geography and Ecosystem Science

+46 46 222 42 62

GIS-centrum 103

16

Senior lecturer

Centre for Geographical Information Systems (GIS Centre)

+46 46 222 42 62

16

Teaching staff

Dept of Physical Geography and Ecosystem Science

16

Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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