The Isaiah Creek study area (52º 39' N, 120º 55' W) is located on the North Arm of Quesnel Lake, approximately 50 km northeast of Horsefly, B.C. It is situated in the Central Cariboo Forest District, and falls within an area zoned for "modified harvest" to protect caribou habitat. The main study site is an area of 73 ha that includes a group selection treatment unit and a control unit that will remain unlogged. The study site is situated within a 147-ha cutblock that also includes a clearcut unit to the west and a unit to the east that will be logged using the single-tree selection silvicultural system.
The main study site is located on a southwest-facing bench with rolling topography at 1100-1240 m. It is in the Quesnel variant of the wet cool subzone of the ICH (ICHwk2). The main tree canopy is dominated by western redcedar (Thuja plicata) and western hemlock (Tsuga heterophylla), with smaller components of Douglas-fir (Pseudotsuga menziesii), hybrid spruce (Picea glauca x engelmannii) and subalpine fir (Abies lasiocarpa). Vaccinium ovalifolium, V. membranaceum, Pachystima myrsinites, Taxus brevifolia, and Oplopanax horridus occur frequently in the shrub layer. Common herbs include Cornus canadensis, Tiarella trifoliata, Rubus pedatus, Gymnocarpium dryopteris, Athyrium filix-femina, and Dryopteris expansa. Moss cover is typically high, and includes species such as Rhytidiopsis robusta, Pleurozium schreberi, and Hylocomium splendens.
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