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The emerging role of drought as a regulator of dissolved organic carbon in boreal landscapes

Author

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  • Tejshree Tiwari

    (Swedish University of Agricultural Sciences)

  • Ryan A. Sponseller

    (Umea University)

  • Hjalmar Laudon

    (Swedish University of Agricultural Sciences)

Abstract

One likely consequence of global climate change is an increased frequency and intensity of droughts at high latitudes. Here we use a 17-year record from 13 nested boreal streams to examine direct and lagged effects of summer drought on the quantity and quality of dissolved organic carbon (DOC) inputs from catchment soils. Protracted periods of drought reduced DOC concentrations in all catchments but also led to large stream DOC pulses upon rewetting. Concurrent changes in DOC optical properties and chemical character suggest that seasonal drying and rewetting trigger soil processes that alter the forms of carbon supplied to streams. Contrary to expectations, clearest drought effects were observed in larger watersheds, whereas responses were most muted in smaller, peatland-dominated catchments. Collectively, our results indicate that summer drought causes a fundamental shift in the seasonal distribution of DOC concentrations and character, which together operate as primary controls over the ecological and biogeochemical functioning of northern aquatic ecosystems.

Suggested Citation

  • Tejshree Tiwari & Ryan A. Sponseller & Hjalmar Laudon, 2022. "The emerging role of drought as a regulator of dissolved organic carbon in boreal landscapes," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32839-3
    DOI: 10.1038/s41467-022-32839-3
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    References listed on IDEAS

    as
    1. Jan Karlsson & Pär Byström & Jenny Ask & Per Ask & Lennart Persson & Mats Jansson, 2009. "Light limitation of nutrient-poor lake ecosystems," Nature, Nature, vol. 460(7254), pages 506-509, July.
    2. Lluís Gómez-Gener & Anna Lupon & Hjalmar Laudon & Ryan A. Sponseller, 2020. "Drought alters the biogeochemistry of boreal stream networks," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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