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Vertical and horizontal profiles of redox potential were studied in two wetland forest ecosystems in Lahei, Central Kalimantan, Indonesia. Eh of the soil surface showed a clear correspondence to the surface micro-topography of a 40 cm difference in relative elevation. The lower inundated soil showed the low values of Eh (0-300 mV) and the higher emerged area showed the high values of Eh (>500 mV). The values of Eh changed clearly at the boundary between inundated and emerged soil. A vertical profile of Eh showed the difference between the plot in a peat swamp forest on well-developed peat, accumulated up to 7.5 m and the plot in a temporal wetland shrub community on 15-30 cm of peat layer, The Eh in the shrub community decreased from the top to a depth of 45 cm. However, the Eh in the peat swamp forest showed constant values from the top to a depth of 50 cm, and the values were > 400 mV. Constantly high values of Eh in the peat swamp forest would be due to aeration by aerenchyma of plants and to the low activity of microorganisms in the peat.

Vertical and Horizontal Distribution of Redox Potential of Soil in Wetland Forests in Lahei, Central Kalimantan, Indonesia