from Part IV - Nutrient dynamics in tropical montane cloud forests
Published online by Cambridge University Press: 03 May 2011
ABSTRACT
Fog water, fog drip, and rainfall chemistry were examined at a seasonal tropical rain forest site in Xishuangbanna, south-west China between November 2001 and October 2002. During this period, radiation fog occurred on 204 days, with a total duration of 1949 hours of which 1618 hours (37% of the total time) occurred during the dry season (November to April). Mean pH values of fog water, fog drip, and rain were 6.78, 7.30, and 6.13, respectively. The ion with the highest concentration in both fog and rain water was bicarbonate (HCO3–), followed by calcium, magnesium, and ammonium. Concentrations of nitrate, HCO3–, ammonium, calcium, and potassium in fog water collected in the latter half of the dry season were significantly higher (p < 0.05) than earlier in the dry season. Ionic concentrations in fog drip were higher than those in fog water, except for ammonium and hydrogen. This is attributed to the washing-off of dust and ash-derived nutrients deposited on the leaves and by the leaching of alkaline ions from the leaves. Dry deposition of ash and dust is most probably related to biomass burning and road construction activity.
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