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Plant and Soil

, Volume 373, Issue 1–2, pp 955–965 | Cite as

Jack pine foliar δ15N indicates shifts in plant nitrogen acquisition after severe wildfire and through forest stand development

  • Stephen D. LeDucEmail author
  • David E. Rothstein
  • Zhanna Yermakov
  • Susan E. Spaulding
Regular Article

Abstract

Background and aims

Natural abundance of the stable nitrogen (N) isotope 15N can elucidate shifts in plant N acquisition and ecosystem N cycling following disturbance events. This study examined the potential relationship between foliar δ15N and depth of plant N acquisition (surface organic vs. mineral soil) and nitrification as conifer stands develop following stand-replacing wildfire.

Methods

We measured foliar δ15N along an 18-site chronosequence of jack pine (Pinus banksiana) stands, 1 to 72 years in age post-wildfire. Foliar δ15N was compared to total δ15N of the organic (Oe + Oa) and mineral (0–15 cm) soil horizons, and organic horizon N mineralization and nitrification as functions of total mineralization.

Results

Foliar δ15N declined with stand age, yet wildfire effects were heterogeneous. Jack pine seedlings on burned, mineral soil patches in the youngest stand were significantly more enriched than those on unburned, organic patches (P = 0.007). High foliar values in the youngest stands relative to mineral-horizon δ15N indicate that nitrification also likely contributed to seedling enrichment.

Conclusions

Our results suggest jack pine seedlings on burned patches obtain N from the mineral soil with potentially high nitrification rates, whereas seedlings on unburned patches and increasingly N-limited, mature jack pine acquire relatively more N from organic horizons.

Keywords

Chronosequence Fire Jack pine Nitrogen 15Nitrification 

Notes

Acknowledgments

Personnel of the USDA-Forest Service and the Michigan Department of Natural Resources provided access to field sites and logistical help. We thank A. Buell, A. Esper, M. Cook, G. Smith, S. Tourtellot and many others for field and lab assistance. We also gratefully acknowledge Chris Clark, Jana Compton and two anonymous reviewers, whose comments greatly improved the quality of this manuscript. This project was supported by funding from the Michigan Botanical Society, Michigan State University’s Biogeochemistry Environmental Research Initiative, the Sustainable Michigan Endowed Project and the Land Policy Institute at Michigan State University. Disclaimer: The views expressed in this paper are those of the authors and do not necessarily represent the views or policies of the U.S. Environmental Protection Agency.

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Copyright information

© Springer Science+Business Media B.V. (outside the USA) 2013

Authors and Affiliations

  • Stephen D. LeDuc
    • 1
    • 2
    Email author
  • David E. Rothstein
    • 1
  • Zhanna Yermakov
    • 1
    • 3
  • Susan E. Spaulding
    • 1
    • 4
  1. 1.Department of Forestry and the Ecology, Evolutionary Biology and Behavior ProgramMichigan State UniversityEast LansingUSA
  2. 2.National Center for Environmental AssessmentUS Environmental Protection AgencyWashingtonUSA
  3. 3.Chicago Park DistrictChicagoUSA
  4. 4.Department of Earth and Planetary ScienceUniversity of California-BerkeleyBerkeleyUSA

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