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Causes of episodic acidification in Alpine streams

Lepori, Fabio, Barbieri, Alberto and Ormerod, Stephen James 2003. Causes of episodic acidification in Alpine streams. Freshwater Biology 48 (1) , pp. 175-189. 10.1046/j.1365-2427.2003.00972.x

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SUMMARY 1. Despite their global importance as mountain landscapes, the effect of acid deposition on running waters in the Alps is still incompletely described. The acid–base status of 30 clearwater streams in Canton Ticino (Switzerland) was therefore assessed at low and high flow across a south/north gradient of acid deposition in 2000. 2. At low flow, no stream was acidic, alkalinity being ≥29 μeq L−1 and pH ≥6.4. However, NO3– was present in streamwater at these flows in concentrations that suggested anthropogenic enrichment, and its concentration correlated with spatial patterns of N deposition from the atmosphere. 3. Severe loss of alkalinity occurred in most streams at high flow during snowmelt (spring) or rainstorms (spring and autumn). Autumn episodes were because of dilution of streamwater alkalinity by rainwater. By contrast, spring episodes involved dilution and NO3– titration, the increase in nitrate being correlated with patterns of N deposition. SO42– declined during most episodes. 4. High NO3– leaching at low flow suggests that catchment soils in Canton Ticino are approaching saturation in N. These data are among the first to illustrate that NO3– can drive episodic acidification in Europe, paralleling locations in north-eastern United States.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Wiley-Blackwell
ISSN: 0046-5070
Last Modified: 04 Jun 2017 06:45

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