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Biogeochemistry

, Volume 141, Issue 3, pp 523–539 | Cite as

Nitrogen oligotrophication in northern hardwood forests

  • Peter M. GroffmanEmail author
  • Charles T. Driscoll
  • Jorge Durán
  • John L. Campbell
  • Lynn M. Christenson
  • Timothy J. Fahey
  • Melany C. Fisk
  • Colin Fuss
  • Gene E. Likens
  • Gary Lovett
  • Lindsey Rustad
  • Pamela H. Templer
Article

Abstract

While much research over the past 30 years has focused on the deleterious effects of excess N on forests and associated aquatic ecosystems, recent declines in atmospheric N deposition and unexplained declines in N export from these ecosystems have raised new concerns about N oligotrophication, limitations of forest productivity, and the capacity for forests to respond dynamically to disturbance and environmental change. Here we show multiple data streams from long-term ecological research at the Hubbard Brook Experimental Forest in New Hampshire, USA suggesting that N oligotrophication in forest soils is driven by increased carbon flow from the atmosphere through soils that stimulates microbial immobilization of N and decreases available N for plants. Decreased available N in soils can result in increased N resorption by trees, which reduces litterfall N input to soils, further limiting available N supply and leading to further declines in soil N availability. Moreover, N oligotrophication has been likely exacerbated by changes in climate that increase the length of the growing season and decrease production of available N by mineralization during both winter and spring. These results suggest a need to re-evaluate the nature and extent of N cycling in temperate forests and assess how changing conditions will influence forest ecosystem response to multiple, dynamic stresses of global environmental change.

Keywords

Climate change Carbon Dissolved organic carbon Hubbard Brook Experimental Forest Nitrogen 

Notes

Acknowledgements

This research was supported by grants from the U.S. National Science Foundation programs in Ecosystem Studies, Long-Term Ecological Research and Long-Term Ecological Research in Environmental Biology and from the Andrew W. Mellon Foundation. J.D. was supported by a Fulbright fellowship of the Spanish Ministry of Education and by a FCT Research Fellowship of the Portuguese Ministry of Education and Science (SFRH/BDP/87966/2012).

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Peter M. Groffman
    • 1
    • 8
    Email author
  • Charles T. Driscoll
    • 2
  • Jorge Durán
    • 3
  • John L. Campbell
    • 4
  • Lynn M. Christenson
    • 5
  • Timothy J. Fahey
    • 6
  • Melany C. Fisk
    • 7
  • Colin Fuss
    • 8
  • Gene E. Likens
    • 8
  • Gary Lovett
    • 8
  • Lindsey Rustad
    • 4
  • Pamela H. Templer
    • 9
  1. 1.Advanced Science Research Center at the Graduate CenterCity University of New YorkNew YorkUSA
  2. 2.Department of Civil and Environmental EngineeringSyracuse UniversitySyracuseUSA
  3. 3.Department of Life Sciences, Centre for Functional EcologyUniversity of CoimbraCoimbraPortugal
  4. 4.USDA Forest Service Northern Research StationDurhamUSA
  5. 5.Vassar CollegePoughkeepsieUSA
  6. 6.Department of Natural ResourcesCornell UniversityIthacaUSA
  7. 7.Department of ZoologyMiami UniversityOxfordUSA
  8. 8.Cary Institute of Ecosystem StudiesMillbrookUSA
  9. 9.Department of BiologyBoston UniversityBostonUSA

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