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There are many sources of nitrogen which eventually get deposited out of the atmosphere and onto the land/surface. Typically higher levels of nitrogen compounds are emitted near urban and roadway locations, raising the levels of nitrogen deposited on the nearby landscape. What are the ecological effects of moderately high (at least double background) and prolonged concentrations (10+ years) of nitrogen deposition on an ecosystem? Please be specific about which type of ecosystem your comments are intended.

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Would help to define magnitudes. Prolonged = decades? Moderately high = 5g/m2/y? –  David Jun 7 at 5:25
    
i tried to be more quantitative in some edits, hope that helps –  farrenthorpe Jun 11 at 4:52
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Up to a certain point, adding nitrogen to soil will increase plant growth. However, too much nitrogen will "burn" plants- stunting root growth and making the plant more susceptible to diseases. Unfortunately, I don't know at exactly what threshold nitrogen becomes "too much"- I suppose it would vary depending on the plants.

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Can you aqdd some references to your answer? –  Chris Jul 12 at 7:23
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