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    Author(s): 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
    Date: 2018
    Source: Biogeochemistry
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (1.0 MB)

    Description

    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.

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    Citation

    Groffman, Peter M.; Driscoll, Charles T.; Durán, Jorge; Campbell, John L.; Christenson, Lynn M.; Fahey, Timothy J.; Fisk, Melany C.; Fuss, Colin; Likens, Gene E.; Lovett, Gary; Rustad, Lindsey; Templer, Pamela H. 2018. Nitrogen oligotrophication in northern hardwood forests. Biogeochemistry. 141(3): 523-539. https://doi.org/10.1007/s10533-018-0445-y.

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    Keywords

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

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https://www.fs.usda.gov/treesearch/pubs/57358