Sammanfattning

Understanding the mechanisms driving carbon dioxide (CO2) concentrations in inland waters is important to foresee CO(2)responses to environmental change, yet knowledge gaps persist regarding which processes are the key drivers. Here we investigated possible drivers across 13 Swedish lakes and streams where the partial pressure of CO2(pCO(2)) has increased over a 21-year period. Overall, we could not identify a single dominating mechanism responsible for the observedpCO(2)increase. In the 8 lakes, we found thatpCO(2)increased, driven either by a possible dissolved organic carbon (DOC) stimulation of microbial mineralization or by water color primary production suppression. In streams, the dominating mechanism for apCO(2)increase was either a change in the carbonate system distribution or a possible nutrient-driven decrease in primary production. This is the first study to demonstrate and explain consistent positivepCO(2)temporal trends in freshwater ecosystems, and our results should be taken into account when predicting future emission of CO(2)from inland waters.

Nyckelord

carbon dioxide; freshwater; inland water; mechanisms

Publicerad i

Inland Waters
2020, Volym: 10, nummer: 3, sidor: 360-372
Utgivare: TAYLOR & FRANCIS LTD

SLU författare

• Wallin, Marcus

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    
  • Uppsala universitet

UKÄ forskningsämne

Oceanografi, hydrologi, vattenresurser


Publikationens identifierare

DOI: https://doi.org/10.1080/20442041.2020.1740549

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/106936