Atmospheric deposition to the edge of a spruce forest in Denmark
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Atmospheric deposition was measured during 1 year at the forest edge of a Norway spruce stand in Denmark. Inside the forest the deposition of H+, Ca2+, Mg2+, Na+, K+, Cl−, NO3−, NH42 and SO42− with canopy throughfall varies with the distance from the forest edge. The deposition at the edge is found to be 10–20 times as high as deposition to an open field and 2–8 times as high as deposition inside the stand. An exponential decrease in deposition as a function of the distance from the forest edge is found. Increased deposition of K+ and non-sea salt Mg2+, which mainly originates as a result of leaching from the needles may be explained by a larger leaf area index (LAI) at the forest edge. Deposition of particulate substances, especially Na+, Cl−, Mg2+ and to some extent SO42−, NH4+ and NO3− is increased much more than the LAI, which we believe to be caused by changes in wind movements at the forest edge.
|Publication status||Published - 1989|