Seasonal transformations of dissolved organic matter and organic phosphorus in a polymictic basin: Implications for redox-driven eutrophication
نویسندگان
چکیده
Redox-driven internal phosphorus (P) loading from lake sediments is a key process for propagating and sustaining cyanobacterial blooms in freshwater lakes. Missisquoi Bay Lake Champlain, VT regularly experiences driven by P as well seasonal transitions, but the response of dissolved organic matter (DOM) to these changing conditions has previously not been investigated this system seldom other redox-dynamic freshwaters. In study, Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) employed explore transformation distribution DOM, including (DOP), spring 2017 winter 2018 along with high-frequency geochemical monitoring. DOM was largely composed allochthonous compounds unique molecules autochthonous sources greater proportions N,S-containing formulae after early summer bloom season during winter. compositions late more aliphatic season, while between aromatic similarities two seasons. contrast, DOP all seasons were highly dissimilar suggested compartmentalized water column, where riverine that degraded transport surface waters absent benthic DOP. Additional sediment core incubation experiments implemented study effects short-term oxygen limitation on composition better constrain potential redox-based drivers their mobility column. Short-term incubations an increase new compounds, little change suggesting selective mobilization microbial iron(III) manganese(IV) reduction. Together, detailed FT-ICRMS data show, first time, how various respond physical freshwaters, demonstrating cycle settings likely impact nutrient bioavailability.
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ژورنال
عنوان ژورنال: Chemical Geology
سال: 2021
ISSN: ['0009-2541', '1872-6836']
DOI: https://doi.org/10.1016/j.chemgeo.2021.120212