Seasonal deposition of ferric hydroxide plaque on roots of wetland plants

摘要

In three wetlands in southeastern Ontario, ferric hydroxide was deposited on the roots ofTypha latifolia(maximum, 67ensp;times;ensp;103ensp;ppm); in four other wetlands, deposition was negligible (ensp;103ensp;ppm). Iron deposition was seasonal, with the peak period in Julyndash;August corresponding to peak biomass production of shoots. In one wetland whereCarex rostrataandPhragmites australisoccurred, seasonal plaque formation was similar. Plaque formation was not obviously related toEhand pH regimes.