Angéli N, Dambrine E, Boudot J P, Nedeltcheva T, Guérold F, Tixier G, Probst A, Party J P, Pollier B, Bourrié G
Institut National de la Recherche Agronomique, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, Nancy, France.
Sci Total Environ. 2009 Jul 1;407(14):4378-86. doi: 10.1016/j.scitotenv.2009.02.008. Epub 2009 Feb 27.
In 1995, in the southwestern Vosges Mountains (NE France), 158 of 395 streams (40%) had a pH lower than 5.5 at baseflow. As elsewhere in Europe, acid deposition has decreased since the seventies, as has base cation deposition. In order to assess the response of streamwater to decreasing deposition, we compared their present chemical composition to their former composition. All comparisons showed a decrease in sulphate concentration, which was greater on granite than on sandstone. In addition calcium, magnesium and aluminium concentrations generally decreased. Acidity in streams draining granite decreased in spring, especially during the eighties; decreases were not observed on sandstone. Continuous monitoring of 5 streams since 1998 confirmed that Al concentrations decreased while changes in pH were small. Chemical trends in streams from the Vosges massif fell between those measured in Northern Europe and Central Europe. This study provides the first broad-scale overview of surface water acidification and recovery in France and emphasizes the need for continuous monitoring to assess long-term changes in aquatic ecosystems.
1995年，在法国东北部的西南孚日山脉，395条溪流中有158条（40%）在基流时pH值低于5.5。与欧洲其他地方一样，自70年代以来，酸性沉降物减少了，碱性阳离子沉降物也减少了。为了评估溪流水对沉降物减少的响应，我们将其当前的化学成分与以前的成分进行了比较。所有比较都显示硫酸盐浓度下降，花岗岩上的下降幅度大于砂岩上的。此外，钙、镁和铝的浓度总体上有所下降。排泄花岗岩的溪流中的酸度在春季下降，尤其是在80年代；砂岩上未观察到下降。自1998年以来对5条溪流的持续监测证实，铝浓度下降而pH值变化很小。孚日地块溪流的化学趋势介于北欧和中欧测量的趋势之间。这项研究首次对法国地表水酸化和恢复情况进行了广泛概述，并强调需要持续监测以评估水生生态系统的长期变化。
