Nitrogen oligotrophication in northern hardwood forests

Peter M. Groffman, 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

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1-17
Number of pages17
JournalBiogeochemistry
DOIs
StateAccepted/In press - May 12 2018

Keywords

  • Carbon
  • Climate change
  • Dissolved organic carbon
  • Hubbard Brook Experimental Forest
  • Nitrogen

ASJC Scopus subject areas

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

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