Predicting the export and concentrations of organic carbon, nitrogen and phosphorus in boreal lakes by catchment characteristics and land use: A practical approach

Marjo Palviainen, Ari Laurén, Samuli Launiainen, Sirpa Piirainen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The majority of C, N and P in boreal lakes are in organic form. Organically bound nutrients are released through biodegradation or photodegradation which affects the water quality, eutrophication and greenhouse gas emissions of lakes. We tested whether open land-use data combined with land-use-specific export coefficients can be used to predict total organic carbon (TOC), dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) loading and lake water concentrations. Using data from 12 lake catchments in eastern Finland, we found that land use and management of the catchment explained a substantial proportion of the variations in TOC (r (2) = 0.78), DON (r (2) = 0.55) and DOP (r (2) = 0.80) concentrations between lakes. The computation does not account for in-lake processes, which are reflected as mismatch between the predicted and observed concentrations. However, this simple practical approach is useful in ranking lakes according to their water quality. The results indicated that natural sources dominate TOC, DON and DOP exports; the background leachings accounted for 57-99 %, 48-96 % and 55-99 % of TOC, DON and DOP export, respectively. The proposed method has promise as a practical decision support tool for assessing the impacts of land use on water quality. The results showed that possibilities to control TOC, DON and DOP loading to surface waters are limited to catchments where the peatland proportion is low and anthropogenic sources significant.
Original languageEnglish
JournalAmbio
Volume45
Issue number8
Pages (from-to)933-945
Number of pages13
ISSN0044-7447
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 4112 Forestry
  • 1172 Environmental sciences
  • Carbon
  • Land use
  • Organic nitrogen
  • Organic phosphorus
  • Specific export coefficient
  • Water quality
  • DITCH NETWORK MAINTENANCE
  • ATMOSPHERIC DEPOSITION
  • TERRESTRIAL CARBON
  • STREAM
  • MATTER
  • FINLAND
  • WATER
  • FORESTS
  • SOILS
  • METABOLISM

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