Phosphorus Availability Promotes Bacterial DOC-Mineralization, but Not Cumulative CO₂-Production.

ABSTRACT: The current trend of increasing input of terrestrially derived dissolved organic carbon (DOC) to boreal freshwater systems is causing increased levels of carbon dioxide (CO₂) supersaturation and degassing. Phosphorus (P) is often the most limiting nutrient for bacterial growth and would thus be expected to increase overall mineralization rates and CO₂ production. However, high carbon (C) to P ratios of terrestrially derived DOC could also cause elevated cell-specific respiration of the excess C in heterotrophic bacteria. Using data from a survey of 75 Scandinavian lakes along an ecosystem gradient of DOC, we estimated in situ CO₂ production rates. These rates showed a unimodal response with DOC-specific CO₂ production negatively related to

SUBMITTER: Allesson L 

PROVIDER: S-EPMC7541949 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature