Effects of simulated acidic rain and lead on the biomass,nutrient status,and heavy metal content of Pleurozium schreberi(Brid.)Mitt

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  • EFFECTS OF SIMULATED ACIDIC RAIN AND LEAD ON THE BIOMASS, NUTRIENT STATUS, AND HEAVY METAL CONTENT OF <i>PLEUROZIUM SCHREBERI</i> (BRID.) MITT.
  • Effects of simulate

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<p>  A 2-year field perturbation experiment to investigate the effects and interaction of simulated acidic rain (pH 5.0, 4.0, 3.0) and lead (0, 50, and 1000 ppb Pb) on the boreal bryophyte Pleurozium schreberi (Brid.) Mitt. in a Pinus banksiana Lamb. forest was designed. No effect of lead or interaction of lead with acidity was found at the end of the experiment. Significant effects (p < 0.01, Duncan's New Multiple Range Test) were observed at pH 3.0 during the second year. As compared to the control, the biomass (kg/ha) of the green P. schreberi layer was reduced by 49.9%; Ca was reduced by 64% (ppm) or 80% (kg/ha), Mg by 40% (ppm) or 69% (kg/ha). Changes in heavy metal content are contrasting: Pb content increased significantly with increasing Pb levels in the simulated acidic rain; Zn and Cu levels increased, but Mn levels decreased at pH 3.0 as compared to the controls. Decreased nutrient retention by the bryophyte layer as a result of increased acid precipitation might affect tree productivity and post-fire successional stages.</p>

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