Futter, Martyn
- Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
Sammanfattning
Are small lakes passive pipes transporting terrigenous organic carbon (dissolved organic carbon [DOC]), or chimneys for CO2 release in the landscape? Using a unique combination of 30-yr measurements, sediment dating and modeling of a small humic lake and its catchment in southeast Norway, we calculated lateral DOC fluxes and in-lake retention. Concentrations and fluxes rose significantly, driven by declining sulfur deposition and increased precipitation. In-lake retention (% of inputs) declined because of higher discharge and lower residence times. DOC removal rates were not sensitive to residence time. Modeled in-lake DOC removal was driven primarily by microbial metabolism and, secondarily, by flocculation, suggesting that the likely fate of lake-retained DOC is CO2 evasion to the atmosphere. Precipitation was the overriding landscape control on DOC fluxes and retention. In a wetter climate, small northern lakes will, on balance, function more as pipes than chimneys, with increasing lateral DOC fluxes but little change in CO2 production.
Publicerad i
Limnology and Oceanography Letters
2018, volym: 3, nummer: 3, sidor: 275-284
Utgivare: WILEY
SLU författare
Valinia, Salar
- Norsk Institutt for Vannforskning (NIVA)
UKÄ forskningsämne
Oceanografi, hydrologi, vattenresurser
Publikationens identifierare
- DOI: https://doi.org/10.1002/lol2.10077
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/112423