© 1974 by Institute of Chartered Foresters
Effect of Water-table Level on Nitrogen Mineralization in Peat
The Macaulay Institute for Soil Research Craigiebuckler, Aberdeen
The effect of drainage on the mineralization of nitrogen in peat has been investigated using samples from a field experiment in which the water table has been artificially maintained at different levels in five plots for a period of 7 years. Samples cut from the o–10 cm horizon were incubated in the laboratory at 30 °C for 120 days in a moist condition (aerobic) and also in a completely waterlogged state (anaerobic). The results of anaerobic incubation indicate that lowering the water-table level to 18 cm significantly decreases the amount of nitrogen mineralized but that further lowering of the water level reverses the position, mineral nitrogen increasing significantly at least to a water-table depth of 34 cm; the position regarding samples incubated under aerobic conditions is more complex but can be explained on the basis of samples containing a mixture of aerated and non-aerated material.
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