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Soil Science Society of America Journal Abstract - WETLAND SOILS

Modeling the Subsurface Hydrology of Mer Bleue Bog

 

This article in SSSAJ

  1. Vol. 74 No. 2, p. 680-694
     
    Received: Apr 20, 2009


    * Corresponding author(s): Dimitre.Dimitrov@NRCan-RNCan.gc.ca
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doi:10.2136/sssaj2009.0148
  1. Dimitre D. Dimitrov *a,
  2. Robert F. Grantb,
  3. Peter M. Lafleurc and
  4. Elyn R. Humphreysd
  1. a Canadian Forest Service, Northern Forestry Centre, 5320 122nd Street, Edmonton, AB, Canada, T6H 355
    b Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB, Canada, T6G 2H1
    c Geography Dep. Trent Univ. Peterborough, ON, Canada, K9J 7B8
    d Dep. of Geography and Environmental Studies, Carleton Univ. Ottawa, ON, Canada, K1S 5B6

Abstract

In this study, the ecosys model was used to simulate the hydrology of the Mer Bleue bog, Ontario, Canada, with seasonally varying water tables in the upper 1 m. The soil profile was divided into three zones of peat (fibric, hemic, and sapric). In the model, large, readily drained macropore fractions in the fibric peat caused low water-holding capacity and high infiltration rates, in contrast to hemic and sapric peat, with small macropore fractions, high water-holding capacities, and low infiltration rates. Model results for peat water contents, θ, and water table depths, Z, were tested with continuous hourly measurements from 2000 to 2004 using time domain reflectometry probes and piezometers. Within the zone of pronounced water table variation, the θ and Z modeled with the Hagen–Poiseuille equation for macropore flow and Richards' equation for peat matrix flow corresponded better to the measured θ and Z (regression slopes between 0.62 and 1.03, intercepts between −0.05 and 0.02 m3 m−3, and R 2 between 0.40 and 0.56), than did the modeled θ and Z with Richards' equation alone (regression slopes between 0.33 and 1.43, intercepts between 0.11 and 0.22 m3 m−3, and R 2 between 0.27 and 0.41). The Richards equation alone, even when parameterized with extremely high or low bulk saturated hydraulic conductivities of fibric peat, modeled slower infiltration, greater water retention, and lower Z than measured. The implications of macropore flow might be of great importance for peatland hydrology, therefore this experimental and modeling work should be extended to other wetlands as well.

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