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Showing 1–4 of 4 results
Advanced filters: Author: Ashley M. Helton Clear advanced filters

  • About a quarter of the nitrogen added to the biosphere is exported from rivers to the ocean or inland basins, indicating substantial sinks for nitrogen must exist in the landscape. Data from nitrogen stable isotope tracer experiments across 72 streams suggests that the total uptake of nitrate is related to ecosystem photosynthesis, and that denitrification is related to ecosystem respiration. A stream network model demonstrates that excess nitrate in streams elicits a disproportionate increase in the fraction of nitrate that is exported to receiving waters and reduces the relative role of small versus large streams as nitrate sinks.

    • Patrick J. Mulholland
    • Ashley M. Helton
    • Suzanne M. Thomas
    Research
    Nature
    Volume: 452, P: 202-205

  • River networks play an important role in biogeochemical processes of the earth system. Here the authors show that cumulative river network function increases faster than watershed size for many biogeochemical processes, particularly at higher river flow, indicating large rivers contribute disproportionately to network function in the Earth System.

    • Wilfred M. Wollheim
    • Tamara K. Harms
    • Jacques C. Finlay
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-9

  • Groundwater discharge generates streamflow and influences stream thermal regimes. Classifying more than 1700 streams across the US by using an empirically-based approach the study shows that the vulnerability of streams to stressors depends on the aquifer source-depth of groundwater discharge

    • Danielle K. Hare
    • Ashley M. Helton
    • Martin A. Briggs
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-10

  • An increase in stream temperature leads to a convergence of metabolic balance, overall decline in net ecosystem productivity, and higher CO2 emissions from streams, according to analyses of temperature sensitivity of stream metabolism across six biomes.

    • Chao Song
    • Walter K. Dodds
    • Ford Ballantyne IV
    Research
    Nature Geoscience
    Volume: 11, P: 415-420