Effects of land-use and atmospheric input on stream and soil chemistry: field results and long-term simulation at Mont-Lozere (Cevennes National Park, Southern France)
1992; Elsevier BV; Volume: 119; Linguagem: Inglês
10.1016/0048-9697(92)90264-s
ISSN1879-1026
AutoresPatrick Durand, Colin Neal, F. Lelong, Jean‐François Didon‐Lescot,
Tópico(s)Odor and Emission Control Technologies
ResumoAbstract The main results of a 9-year study of three mountain Mediterranean ecosystems (grassland, beech and spruce forests) are presented. Atmospheric inputs are influenced both by anthropogenic acidic oxides and by Saharan alkaline dust. The streams are moderately acidic (pH 5.8), and the concentrations show irregular but limited variations with flow. The stream draining the spruce catchment exhibits the highest concentrations. The MAGIC model has been applied to evaluate the long-term changes in soil and water quality with forest development and changing SO2 emissions. The simulations suggest that the forested catchments are currently acidifying much more rapidly than the grassland catchment, In the broadleaf ecosystem, the acidification is mainly due to a high biological uptake: a rapid recovery is predicted even if proposed reductions in SO2 emissions are not enacted. For the conifer catchment, the model shows a prolonged decline of soil and water quality without emission reduction: a slow recovery is implied with 60% emission reduction. The results show the relative importance of biological uptake and atmospheric scavenging processes for beech and spruce vegetation, respectively.
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