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A long-term field experiment was initiated to simulate chronic atmospheric N deposition, a widespread phenomenon in industrial regions of the world. Eight years of experimental nitrate ( $${\text{NO}}_{\text{3}}^-- $$ ) additions (3 g $${\text{NO}}_{\text{3}}^-- $$ -N m−2 per year) to four different northern hardwood forests located along a 500 km geographic gradient dramatically increased...
Human activity has substantially increased atmospheric NO 3− deposition in many regions of the Earth, which could lead to the N saturation of terrestrial ecosystems. Sugar maple (Acer saccharum Marsh.) dominated northern hardwood forests in the Upper Great Lakes region may be particularly sensitive to chronic NO 3− deposition, because relatively moderate experimental increases (three times ambient)...
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