Nitrate and dissolved organic carbon mobilization in response to soil freezing variability

Colin B. Fuss, Charles T. Driscoll, Peter M. Groffman, John L. Campbell, Lynn M. Christenson, Timothy J. Fahey, Melany C. Fisk, Myron J. Mitchell, Pamela H. Templer, Jorge Durán, Jennifer L. Morse

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Reduced snowpack and associated increases in soil freezing severity resulting from winter climate change have the potential to disrupt carbon (C) and nitrogen (N) cycling in soils. We used a natural winter climate gradient based on elevation and aspect in a northern hardwood forest to examine the effects of variability in soil freezing depth, duration, and frequency on the mobilization of dissolved organic carbon (DOC) and nitrate (NO3 ) in soils over the course of 2 years. During a winter with a relatively thin snowpack, soils at lower elevation sites experienced greater freezing and especially variable freeze/thaw cycles, which in turn led to greater leaching of DOC from the organic horizon during the following growing season. In contrast to several previous field manipulation studies, we did not find changes in soil solution NO3 concentrations related to soil freezing variables. Our results are consistent with a soil matrix disturbance from freezing and thawing which increases leachable C. These results build upon previous laboratory experiments and field manipulations that found differing responses of DOC and NO3 following soil freezing, suggesting that mobilization of labile C may suppress NO3 losses through microbial immobilization of N. This research highlights the importance of studying natural variation in winter climate and soil freezing and how they impact soil C and N retention, with implications for surface water runoff quality.

Original languageEnglish (US)
Pages (from-to)35-47
Number of pages13
JournalBiogeochemistry
Volume131
Issue number1-2
DOIs
StatePublished - Dec 1 2016

Keywords

  • Climate change
  • Northern hardwood forest
  • Snow
  • Soil frost
  • Soil water
  • Winter

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

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  • Cite this

    Fuss, C. B., Driscoll, C. T., Groffman, P. M., Campbell, J. L., Christenson, L. M., Fahey, T. J., Fisk, M. C., Mitchell, M. J., Templer, P. H., Durán, J., & Morse, J. L. (2016). Nitrate and dissolved organic carbon mobilization in response to soil freezing variability. Biogeochemistry, 131(1-2), 35-47. https://doi.org/10.1007/s10533-016-0262-0