The effect of microtopography and vegetation on the catchment of airborne particles measured by remanent magnetism |
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Authors: | Frank Oldfield Ann Brown Roy Thompson |
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Institution: | 1. Department of Geography, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, England;2. Department of Geophysics, University of Edinburgh, Edinburgh, EH9 3JZ, Scotland |
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Abstract: | Measurements of saturation isothermal remanent magnetization (SIRM) for recent ombrotrophic peats show that the rate of deposition of magnetic particulates from the atmosphere varies strongly in response to the persistent, small-scale, spatial changes in vegetation and microtopography characteristic of many raised bogs. Hummock environments may trap over an order of magnitude more magnetic particulates than do Sphagnum lawns and pools. These results, thought to reflect the interception of subhorizontally moving particles by the hummock forming plants, have potentially important implications for studies of pollen deposition (“influx”) rates in peat. |
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