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Limnological Effects of Wood Ash Application to the Subcatchments of Boreal, Humic Lakes

^a Univ. of Helsinki, Lammi Biological Station, FIN-16900 Lammi, Finland
^b Pirkanmaa Regional Environment Centre, P.O. Box 297, FIN-33101 Tampere, Finland

View larger version (24K): [in a new window]   Fig. 1. Water pH, alkalinity, conductivity, and PO4–P concentration of lake water in tank experiments 8 d after addition of wood ash.

View larger version (30K): [in a new window]   Fig. 2. Chlorophyll a and primary production (mean ± SD) 4 d after ash treatment in tank experiments.

View larger version (26K): [in a new window]   Fig. 3. Alkalinity, conductivity, and concentration of K in the brooks of Lake Nimetön in 1997–1999. Brook 1 flows from ash-treated peatland and the control brook from untreated peatland.

View larger version (25K): [in a new window]   Fig. 4. Water pH in the lakes (at depth 0–2 m) in 1997–1999.

View larger version (30K): [in a new window]   Fig. 5. Number of Rotatoria in the lakes before (1997) and after (1998) ash application.