The soil calcium levels decrease as more acid rain reacts with forest ground. If you thought calcium was only good for strong teeth and bones, think again.
Calcium is also good for the trees.
Calcium levels in forest soils, important in helping trees ward off stresses such as temperature changes and insect defoliation, have decreased in the eastern United States, according to a report by the U.S. Geological Survey, Department of the Interior. The scientists believe acid rain is to blame. At 10 different sites, scientists are beginning to see reduced resistance to defoliation by insects and low winter temperatures by sugar maples and red spruce trees. The researchers believe reduced soil calcium levels are to blame. Calcium in the soil works to neutralize acid rain.