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.
How this study connects
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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.
Study at a glance
- Design
- Animal / in-vitro — C18 hydrophobicity fractions of freshwater DOM incubated 150 days with DOC-loss tracking
- N
- N=3 · Three sites (humic stream, clearwater lake, eutrophic lake); 114 samples (3 sites × 6 samples × fractions)
- Population
- Freshwater dissolved organic matter from Swedish stream and lake waters
- Outcome
- Hydrophilic DOM fractions lost 12–25% of DOC in 150 days versus 6–15% for hydrophobic fractions
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Inspect source passages
Hydrophilic freshwater DOM biodegrades fastest
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Incubations ran for 150 days.
bi-weekly over 150 days
Did the pattern depend on site type?
differences in biodegradability emerged that were common for all sites
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.
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