Carbon cycle
Hydrophilic freshwater DOM biodegrades fastest
Open access · cc by · source: Europe PMC
Across a Swedish stream and two lakes, the most water-loving DOM fractions lost 12–25% of DOC in 150 days versus 6–15% for hydrophobic fractions.
Key findings
Hydrophilic fractions (U and 1) were most labile; hydrophobic fractions were most refractory; the pattern held at all three sites; pooling fractions did not show a strong priming effect.
Methodology
Split DOM from a humic stream, a clearwater lake, and a eutrophic lake on C18 by hydrophobicity, then incubated fractions 150 days and tracked DOC loss and composition.
Limitations
Three Uppland waters cannot represent all inland waters, and MS still under-samples the most hydrophilic molecules.
How this study connects
Role on claims
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Across a Swedish stream and two lakes, the most water-loving DOM fractions lost 12–25% of DOC in 150 days versus 6–15% for hydrophobic fractions.
Evidence for the claim as stated.
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