Abstract
About 15 and 9% of rainfall were intercepted by the top- and sub-canopy layer, respectively. Although seasonal base cations concentrations in the sub-throughfall were higher than those in throughfall, the calculated base cations leached from the sub-canopy was significantly low relative to that in the top-canopy. The uptakes of H + and NH + in the top-canopy were significantly higher than the sub-canopy, suggesting that the acidity buffering processes mainly took place in the top-canopy. Annual mean dry deposition of Ca 2+ accounted for 53.1% of its annual total deposition, which was higher than that of Mg 2+ (28.2%) and K + (29.8%). The annual dry deposition of NH + amounted to 30.6% of its annual total deposition. The annual total deposition of base cations was similar to the total deposition of inorganic nitrogen (NH + -N, NO − -N), which were 26.2 and 26.5% of annual total
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