Abstract
Treatment of Norway spruce forest with artificial acid rain at extreme pH values decreased the pH of the needle litter. Extractable cellulase activity showed a low correlation with litter pH and none with moisture. The respiration was correlated with a second degree polynomial of the moisture. When cellulase was included in the multiple regression, with respiration as the dependent variable, the correlation was improved. It is indicated that acid precipitation has a small effect on biological activity in the litter measured as respiration and cellulase.
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