The National Park Service (NPS) is a United States agency established in 1916, that works with all
national parks and memorials across the nation. This report series evaluates the relative sensitivity
of National Park Service parks and inventory & monitoring networks to potential acidification effects
caused by atmospheric nitrogen (nitrate and ammonium) and sulfur (sulfate) deposition. In terrestrial
ecosystems, acidification depletes soil nutrients and mobilizes aluminum, affecting plant health and
growth. In lakes and streams, acidification harms fish, amphibians, and aquatic insects. This is one of
their reports.
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