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- W2088334522 abstract "Climate-related shifts in forest composition and chemistry will likely affect the quantity and quality of dissolved organic matter (DOM) entering inland waters, and consequently, carbon dioxide (CO 2 ) evasion. We examined the photodegradation of DOM derived from 2 common riparian plant species ( Populus tremuloides and Salix alba ) grown at ambient (360 ppm) and elevated (720 ppm) atmospheric CO 2 concentrations. Rates and total photolytic CO 2 production were determined for sterilized leachates ranging from 5 to 100 mg L −1 dissolved organic carbon (DOC). Based on multiple regression analysis, DOC concentration, followed by plant species, best predicted the rate and total flux of CO 2 . Photolytic CO2 production increased linearly with DOC concentration; however, the 5 mg L −1 treatment had the greatest rate per unit carbon, suggesting a self-shading effect of increasing DOC. The atmospheric CO2 conditions under which the plants were grown had no statistically significant effect, despite observed differences in CO 2 fluxes between ambient and elevated Populus leachates. Fluorescence data suggest differences in photolytic CO 2 production among treatments are related to differences in plant chemistry within the humic fraction. Thus, the magnitude of the photolytic CO 2 flux from fresh waters in the future will depend primarily on climate-related changes in the quantity of terrestrial DOM inputs and secondarily by DOM source." @default.
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- W2088334522 date "2014-04-01" @default.
- W2088334522 modified "2023-09-24" @default.
- W2088334522 title "Alterations in the photomineralization of allochthonous DOM related to elevated atmospheric CO2" @default.
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- W2088334522 doi "https://doi.org/10.5268/iw-4.2.626" @default.
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