
Seismic lines are a prominent disturbance in the boreal forest, characterized by clearcut lines between 1.5-10 meters wide, fragmenting the landscape. Due to increased use by wildlife, and frequently exhibiting low seedling recruitment and growth rates, seismic lines require further understanding to facilitate recovery. It is important to understand how soil hydrophysical and hydrologic properties are altered by seismic lines. This study quantified soil and hydrology properties on seismic lines at two sites south of Fort McMurray Alberta during 2021 and 2022. Water table levels were measured weekly, and were paired with measurements of bulk density, saturated hydraulic conductivity, porosity and specific yield. A snow study, completed in March of 2022, analyzed snow depth, density and snow water equivalent across seismic lines. Seismic lines caused compression in lowlands, and moss removal in uplands. Bulk density increased on seismic lines by 16% and 124% in lowland and upland ecosites respectively. Saturated hydraulic conductivity decreased on seismic lines by one order of magnitude for upland and lowland ecosites. Porosity decreased significantly at the rooting zone in upland ecosites. Specific yield decreased significantly at the surface of upland and lowland ecosites. Water table variability was increased on seismic lines, however depth to water table was more related to topographic position. Snow water equivalent was up to 90 mm higher than the natural area on East-West oriented lines and those which were widest. The results may provide information to researchers and industry partners on important ecosite factors which may limit seismic line recovery trajectories.
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