Spatiotemporal controls on the delivery of dissolved organic matter to streams following a wildfire

Roebuck, J. Alan; Bladon, Kevin D.; Donahue, David; Graham, Emily B.; Samantha, Grieger,; Morgenstern, Karl; Norwood, Matthew J.; Wampler, K.A.; Erkert, Lisa; Renteria, Lupita; Danczak, Robert E.; Fricke, Susan; Myers‐Pigg, Allison

doi:10.1002/essoar.10511361.1

Cited by 2 publications

(2 citation statements)

References 59 publications

(75 reference statements)

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“…Data to support the findings for this research are available both in the Supporting Information and on Zenodo (Roebuck et al, 2023).…”

Section: Data Availability Statementsupporting

confidence: 58%

Hydrobiogeochemical Controls on the Delivery of Dissolved Organic Matter to Boreal Headwater Streams

Roebuck,

Prestegaard,

Gaviria

et al. 2023

Water Resources Research

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Understanding controls on the delivery of dissolved organic matter (DOM) from terrestrial to aquatic systems is key for constraining carbon balances and fluxes in boreal headwater catchments. The largest export of DOM generally occurs during intense periods of water delivery to the landscape (e.g., rain events); however, the timing and magnitude of DOM is complicated by geomorphological, hydrometeorological, and biogeochemical variability. To better assess mechanisms controlling the delivery of DOM to boreal streams, DOM was investigated in two morphologically distinct catchments of an experimental forest watershed in western Newfoundland, one dominated by low relief wetlands and the other by steep hillslopes. The DOM was compared during two fall storms of similar magnitude but contrasting moisture conditions during the autumn transition. Variable concentrations and optical character highlighted antecedent conditions are important for the delivery of DOM to boreal streams. Concentration‐discharge relationships with stream hydrograph separation analysis suggest preferential flowpaths through shallow mineral horizons as a key pathway for delivery of DOM in the hillslope dominated catchment compared to rapid input from near‐stream wetlands in the low relief catchment. Loss of DOM via preferential pathways suggests an additional mechanism for surface soil carbon loss not directly informed by lateral flow and soil hydrology, which has important implications for our conceptualization and modeling of carbon fluxes in boreal systems. These results suggest watershed scale responses of DOM in boreal headwater catchments are complex, and better linkages between catchment scale hydrology and landscape hydrobiogeochemistry are required to constrain terrestrial to aquatic carbon fluxes in boreal landscapes.

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“…Data to support the findings for this research are available both in the Supporting Information and on Zenodo (Roebuck et al, 2023).…”

Section: Data Availability Statementsupporting

confidence: 58%

Hydrobiogeochemical Controls on the Delivery of Dissolved Organic Matter to Boreal Headwater Streams

Roebuck,

Prestegaard,

Gaviria

et al. 2023

Water Resources Research

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“…Individual sample International Generic Sample Numbers (IGSNs) are provided in Data Set . A comprehensive data package that accompanies this work is freely available on ESS‐DIVE (Roebuck et al., 2022).…”

Section: Data Availability Statementmentioning

confidence: 99%

Spatiotemporal Controls on the Delivery of Dissolved Organic Matter to Streams Following a Wildfire

Roebuck

Bladon

Donahue

et al. 2022

Geophysical Research Letters

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Fire regimes in the western US are changing, with patterns in burn area and burn severity becoming disconnected from historical fire regimes (Haugo et al., 2019). These shifting fire patterns are of increasing concern for watershed biogeochemical processes when considering the known impacts of wildfire on water quality and aquatic ecosystem health, which can persist for years post-fire (Bladon et al., 2014;Emelko et al., 2016;Niemeyer et al., 2020). The intermediate-and long-term influences of wildfires on water quality are diverse across affected watersheds Santos et al., 2019;Sherson et al., 2015). Post-fire stream water chemistry, for example, is thought to result from an interplay between biogeochemical and hydrologic processes impacted by fire, such as water availability and soil water repellency (Niemeyer et al., 2020). In fact, the environmental fate of fire-impacted materials-also termed pyrogenic organic matter (PyOM)-is thought to be determined by its first interactions in water post-fire (Masiello & Berhe, 2020). The short-term hydrological response to fires is also regionally dependent. For example, high hydrological connectivity between hillslopes and streams in highland regions of the western US accelerates the delivery of water to streams post-fire (Hallema et al., 2017). This immediate hydrologic response is dependent on a complexity of factors that alter the chemical and physical properties of the watershed soils, including burn severity (Moody et al., 2016).

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Spatiotemporal controls on the delivery of dissolved organic matter to streams following a wildfire

Cited by 2 publications

References 59 publications

Hydrobiogeochemical Controls on the Delivery of Dissolved Organic Matter to Boreal Headwater Streams

Hydrobiogeochemical Controls on the Delivery of Dissolved Organic Matter to Boreal Headwater Streams

Spatiotemporal Controls on the Delivery of Dissolved Organic Matter to Streams Following a Wildfire

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