Phosphorus has generally been considered more important than nitrogen in determining the biomass of phytoplankton and the trophic state of the system as a whole (Schindler 1977, Schindler 1978, OECD 1982).
Effects of acid deposition on standing waters are largely confined to oligotrophic lakes which tend to occur in catchments underlain by lithologies (rock types) such as granites, sandstones and schists which have low weathering rates. In these systems, base cation supply from weathering may be insufficient to balance deposited acidity. Acidification is therefore rarely likely to affect mesotrophic to eutrophic lakes or canals as base cation supply is sufficient to buffer effects of acidification.
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