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Title: Assessment of Nitrogen deposition effects and empirical critical loads of Nitrogen for ecoregions of the United States
Author: Pardo, L.H.; Robin-Abbott, M.J.; Driscoll, C.T., eds.
Publication: Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 291 p.
Key Words: air pollution, atmospheric N deposition, critical nitrogen loads, biodiversity, nitrate leaching, nitrogen saturation, plant nitrogen concentration, natural resource protection, vegetation type conversion
Abstract: 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 1 to 39 kg N ha-1 y-1. 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 different life forms: diatoms, lichens and bryophytes, mycorrhizal fungi, herbaceous plants and shrubs, trees.
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