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Ammonia air-surface exchange in an unfertilized hay field in the southeastern U.S.
Citation:
WALKER, JR., J. T., J. Matthew, J. O. BASH, E. Nemitz, AND W. Robarge. Ammonia air-surface exchange in an unfertilized hay field in the southeastern U.S. In Proceedings, Nitrogen and Global Change, Key Findings – Future Challenges, Edinburgh, SCOTLAND, April 11 - 15, 2011. European Science Foundation, Strasbourg Cedex, France, 2 p., (2011).
Impact/Purpose:
conference paper
Description:
There is growing interest in the U.S. to derive total nitrogen deposition budgets for natural environments in support of critical loads approaches for managing ecosystem health. The contribution of NH3 to nitrogen dry deposition currently represents a significant uncertainty in such budgets, owing to a general lack of data from which to derive site specific annual fluxes and for development and testing of flux algorithms suitable for regional air quality models. We measured NH3 bi-directional exchange over an unfertilized grass field managed for hay production. Objectives were to examine the influence of management practices (cutting and removal of cuttings) on fluxes and to assess the relative importance of soil versus foliage processes with respect to the net canopy-scale flux.
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