Numéro |
J. Phys. IV France
Volume 107, May 2003
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Page(s) | 427 - 430 | |
DOI | https://doi.org/10.1051/jp4:20030332 |
J. Phys. IV France 107 (2003) 427
DOI: 10.1051/jp4:20030332
Effects of forest fire and fire-fighting operations on water chemistry in Tyresta National Park, Stockholm, Sweden
H. Eriksson, F. Edberg and H. BorgInstitute of Applied Environmental Research, Stockholm University, 10691 Stockholm, Sweden
Abstract
After a large forest fire in Tyresta National Park, Sweden, monitoring programs were started to study the
consequences on the biology and chemistry in the burned area. To study the effects on the water chemistry, four
brooks in the same water system were chosen for further studies. Samples were also taken in a limed lake
downstream the brooks. The sites were sampled 10 times each year, starting the month after the fire, and a range of
chemical analyses where performed. Pre-fire data exists for 2 of the brooks and the lake due to former studies in
the area. In the brooks drastic changes of the water chemistry were seen immediately after the fire. pH in the
brooks deereased with up to 2 pH-units from over 6 to about 4,5 and labile inorganic aluminium increased to over
400
g/l in the most affected brooks. Other determined metals and nutrients in the brooks also increased. In the
lake no changes in pH or aluminium were measured, but significant (p
<0,01) increases of chloride, sulphate,
magnesium, potassium, sodium, manganese, zinc and cadmium where observed.
© EDP Sciences 2003