Recovery of forest soils from Acid Rain in the Hubbard Brook Experimental Forest, New Hampshire, USA

Meanwhile, SO2 emissions, the most important precursor of Acid Rain, declined sharply since the 1980s. However, our knowledge how much improvement has been achieved for forest soils is limited. Supply of historically lost base cations may help to define and to evaluate soil recovery from Acid Rain over time. It is hypothesized that additions of base and acid cations affect soil recovery. Pre-treatment (1995) and early treatment data (1996-1999: control, CaCl2 treated and Al2Cl3 treated plots) of soil (only 1995) and soil solution will be compared with snapshots during the summers 2012 and 2022.