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This report synthesizes current research relating atmospheric nitrogen (N) deposition to effects on terrestrial and aquatic ecosystems in the United States and to identify empirical critical loads for atmospheric N deposition. The report evaluates the following receptors: freshwater diatoms, mycorrhizal fungi and other soil microbes, lichens, herbaceous plants, shrubs, and trees. The main responses reported fell into two categories: (1) biogeochemical; and (2) individual species, population, and community responses. The range of critical loads for nutrient N reported for U.S. ecoregions, inland surface waters, and freshwater wetlands is presented. This range spans the range of N deposition observed over most of the country. The empirical critical loads for N tend to increase in the following sequence for four different life forms: diatoms, lichens and bryophytes, mycorrhizal fungi, herbaceous plants, shrubs, trees.
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Subjects
Water, Nitrogen compounds, Ecology, Atmospheric deposition, Pollution, AirPlaces
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Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States
2011, U.S. Dept. of Agriculture, Forest Service, Northern Research Station
in English
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"May 2011"--P. [2] of cover.
Includes bibliographical references.
Also available on the World Wide Web.
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