Environmental Engineering Reference
In-Depth Information
Figure 4.7
Decrease in lake pH as
inferred from the diatom population
structure. The graphs represent changes
which have occurred over the period
from pre-industrial times until about
1980 to 1985, and indicate the
percentage of lakes in each region in
which the pH has declined by specific
amounts
Source:
Form Charles
et al.
(1990)
lead to a reduction in lake acidity is perhaps
reflected in rising pH values in some lakes in
Britain and Scandinavia, but the data are as yet
too limited to provide conclusive results (Last
1989; Mason 1990).
presence of soot from the burning of fossil fuels
supports the industrial origin of the increased
acidity (Last 1989). The corollary, that decreased
acid emissions from industrial activities should
