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Environmental chemistry

Is acidification still an ecological threat?

Abstract

There has been a significant reduction in anthropogenic acid deposition in Europe and North America, and now we need to gauge the rate and extent of ecosystem recovery. Stoddard et al.1 have reported a widespread aquatic recovery from acidification in European ecosystems in response to a fall in sulphate deposition. But many sites in central Europe are showing a significant delay in aquatic recovery from acidification, or even no recovery at all, and only some of them show biological recovery of waters or a recovery from soil acidification. Ecosystem management still needs to consider the consequences of acidification.

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Figure 1: Nutrient cation concentration (where C represents the sum of the Ca2+, Mg2+, K+ and Na+ ion concentrations) in throughfall (precipitation below forest canopy; triangles) and streams (circles) at the catchments Lange Bramke (top) and Lehstenbach (bottom) in Germany.

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Alewell, C., Manderscheid, B., Meesenburg, H. et al. Is acidification still an ecological threat?. Nature 407, 856–857 (2000). https://doi.org/10.1038/35038158

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