Abstract
Leaching of major ions from acid precipitation in a subtropical forest was examined based on an experiment in four sample sites in Shaoshan City, Hunan Province, China, from January 2001 to June 2002. Results clearly show that when rain passed through the canopy, pH increased and the evidence of ion uptake was presented for SO42−, NO3−, Mg2+ and NH4+ ions, especially of NH4+ and NO3−. The percentages of dissolved SO42−, Ca2+ and Mg2+ show a decreasing trend with increasing rainfall. Percentages of leaching Ca2+, K+ and Cl− ions show an increasing trend as a function of increased pH values. The forest canopy in Shaoshan City has a strong effect on the uptake of SO42− and NO3− ions under acid rain conditions. The decreasing order of ions leaching in the forest canopy is as follows: K+ > Ca2+ > Cl− > Mg2+ > SO42− > NO3− > NH4+ > Na+.
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