Effect of simulated acid precipitation on algal fixation of nitrogen and carbon dioxide in forest soils

Productivity and Density of Soil Algae in an Agricultural System

“…Their results were reported as radioactivity taken up (counts per minute) rather than as absolute amounts of carbon fixed. Chang and Alexander (1983) reported actual C0 2 assimilation rates for soils that had been incubated in the light for 21 d to enhance the development of indigenous algae and then treated with varying amounts of simulated acid precipitation. Hunt and co-workers (1979) did a careful study of seasonal changes in algal numbers in field and forest soils and related the changes to environmental parameters.…”

Effects of acid-forming emissions on soil microorganisms and microbially-mediated processes /

“…Then, with intermittent periods of soil anaerobiosis (e.g., from heavy rains) the stage would be set for rapid denitrif ication Chang and Alexander (1983b) studied the effect of simulated acid rain at pH 3.5 and 5,6 on the rate of N2-fixation by indigenous soil algae. They found this particular N2-fixation pathway to be highly sensitive and noted a significant decrease in N2-fixation with increasing acidity.…”

The effects of acid deposition on forests /

“…This also helps to explain why the production associated with nodule nitrogen fixation does not inhibit the infection process (Tabatabai 1985). Chang and Alexander (1983) showed that soil algal nitrogen fixation is reduced by pH 3.5 "rain", perhaps through reduced photosynthesis because CO2 fixation is also reduced. Licher are notoriously sensitive to pollutants (Nieboer et al .…”