Consistent with other studies, evapotranspiration was greater in locations with a Spaghnum moss layer than in locations with a surface of peat soil. moss layer was present, a slow continuous net lateral input of water from the upstream catchment area supported the water table during drought periods, which was not observed in locations lacking Sphagnum. ![]() ![]() The timing and magnitude of the lateral flow differed considerably between locations with differing ecological conditions, indicating that shallow lateral flow is an important determining factor in the ecohydrological trajectory of a recovering bog system. As an initial demonstration of this method, a series of four microcosm experiments were set up in locations with differing ecological quality and land management histories, on a raised bog complex in the midlands of Ireland. Analysis of the difference in water table fluctuation inside and outside the microcosm experimental areas allowed the water balance to be constrained and the calculation of lateral flow and evapotranspiration. A novel method is presented using microcosms installed in the field to understand the dynamics of shallow lateral flow. An understudied aspect of peatland ecohydrology is how shallow lateral flow impacts local hydrological conditions and water balance, which are critical for peatland restoration success. The importance of characterizing the ecohydrological interactions in natural, damaged/drained, and restored bogs is underscored by the importance of peatlands to global climate change and the growing need for peatland restoration. The p values represent the significance of the difference in mean storativity inside and outside the microcosm, determined from a two sample t‐test of equal variance for each depth class. Storativity determined inside and outside the microcosms for various depth classes at the SBC and EC locations. Example of changes in water table inside and outside of the EC and SBC microcosms for a relatively dry period in April and May 2017. Adjustments in the EC net lateral flow and ET are estimated for the period when there was differential ET inside and outside of the microcosm due to differences in initial water table.įigure S4. This occurs notably in the June 6 rainfall event at Abbeyleix. Rainfall data is taken from the near‐by CarlowOak Park weather station, which may be different than the actual rainfall at Abbeyleixdue to spatial variation in rainfall. Aspects of the water balance, showing cumulative changes in rainfall and ET and resultant net changes in lateral flow and storage over time with respect to Apfor summer (April–August) 2018, as in Figure Figure7. ![]() Note the difference in scale in 2018 to capture the drought period.įigure S3. Hourly water table with respect to the spring (March) ground surface elevation at each of the sampling locations for the calendar years of (a) 2017 and (b) 2018. (b) Total monthly rainfall over the study period plotted together with the 2001–2017 mean monthly rainfall.įigure S2. Figure S1 (a) Average monthly temperature over the study period plotted together with calculated daily P‐M ET0.
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