Exchange of Ca2+, Mg2+ and K+ and uptake of H+, NH4+ for the subtropical forest canopies influenced by acid rain in Shaoshan forest located in Central South China

A total of ten 30m × 30m, researching plots in Shaoshan forest from January to December of 2001 is used for this study in Hunan Province. The atmospheric deposition, the total canopy leaching, the exchange of base cations (Ca2+, Mg2+ and K+), and the uptake of H+ and NH4+ by the canopies are estimated and quantified. The research results show that the maximal element in the total canopy leaching is Ca2+, the minimum is Mg2+ and the mid K+, with …