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acid deposition research acid precipitation acid precipitation's acid rain acidic properties acidification addition ADIRONDACK affected by acid air pollutants aluminum aquatic ecosystems aquatic systems assessing atmospheric deposition average pH Brook Experimental Forest buffer Burlington calcium chemical chemistry concentration of hydrogen contain nutrients decline Delaware deposition monitoring determine the relationship dieback dry deposition Durham effects of acid effects on terrestrial emissions encourage the leaching entire tree forest environment forest growth forest management Forest soils forest system gases Hampshire high-elevation Hubbard Brook Experimental hydrogen ions impact of acid lakes and streams leaf surface magnesium man-made normal Northeastern Station Parsons Pennsylvania phenomenon potassium Project Leader Research rainfall Reproduction and Regeneration Researchers at Orono scientists soil particles species storm events Studies are underway sulfur and nitrogen sulfur ion term acid terrestrial and aquatic trace elements trace metals underway to determine University Park urban forests USDA Forest watersheds West Virginia Wet and dry