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- W2029105824 abstract "Simulated raindrops of pH 5.6 or 3.2 were sprayed on four boreal forest plant species in situ, and raindrops were subsequently collected from their leaves for chemical analysis. The purpose was to understand better the changes involved in foliar neutralisation of acidic raindrops. The species used were Cornus canadensis, Aralia nudicaulis, Maianthemum canadense, and Acer spicatum. Samples were analysed for Ca 2+ , Mg 2+ , Na + , K + , [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], Cl − , and F − , as well as pH. Changes in leaf raindrop ion concentrations were greater when sprayed with the pH 3.2 than with the pH 5.6 rain. Both increases and decreases in ion concentration were found, indicating leaching and (or) dissolution of particulates on the leaf or retention by the canopy, respectively. Rapid changes in ion concentrations suggest surface deposits play an important role in leaf raindrop neutralisation. Increases in [Ca 2+ ] and [Mg 2+ ] in raindrops with greater neutralisation are evidence that cation exchange may also be occurring (r 2 = 0.170 and 0.321, respectively, at pH 3.2; p < 0.01). There were significant negative correlations between changes in [H + ] and changes in[Formula: see text], [Formula: see text], and [Formula: see text] (r 2 = 0.562, 0.525, and 0.297, respectively, at pH 3.2;p < 0.01). Most of the other ions measured also showed significant correlations with changes in [H + ], but generally the correlation could account for only a small percentage of the observed results (low r 2 ). Dry deposition was also measured." @default.
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- W2029105824 date "1988-12-01" @default.
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- W2029105824 title "Chemical changes in simulated raindrops following contact with leaves of four boreal forest species" @default.
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- W2029105824 doi "https://doi.org/10.1139/b88-332" @default.
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