Biogeochemistry

, Volume 76, Issue 2, pp 373–394 | Cite as

Export of DOM from Boreal Catchments: Impacts of Land Use Cover and Climate

Article

Abstract

Dissolved organic matter (DOM) is an important fraction in carbon (C) and nutrient budgets for aquatic ecosystems and can have broad effects on food webs and nutrient cycling. To look at the role land use cover and climate might play in DOM transport from the boreal region, the export of total organic carbon (TOC), total organic nitrogen (TON) and dissolved organic phosphorus (DOP) was estimated for Finnish main rivers and their sub-catchments, altogether 86 catchments, situated between latitudes 60° N and 69° N and covering 297,322 km2, 88% of the total area of Finland. On an average, 94% of the TOC, 90% of the total nitrogen (TN) and 40% of the total phosphorus (TP) in Finnish rivers was in a dissolved form. The majority of the DOM export from Finnish catchments consists of organic C. The TOC export increased with increasing peatland proportion (r = 0.39, p = 0.003), while TON export increased with the increasing percentage of agricultural land (r = 0.60, p <0.001). Although upstream lakes covered only on average 9% of the catchment area, they were the most important predictor for TOC, TON and DOP export (r = −0.83, r = −0.82 and r = −0.61, respectively). The higher the upstream lake percentage, the lower the export indicating organic matter retention in lakes.

Keywords

Carbon Fluxes Nitrogen Organic matter Phosphorus River basins 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Tuija Mattsson
    • 1
  • Pirkko Kortelainen
    • 1
  • Antti Räike
    • 1
  1. 1.Finnish Environment InstituteHelsinkiFinland

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