Name
Moss recovery five years following wildfire in a peatland and rock barrens landscape
Description
Peatlands are large carbon stores, and play an important role in climate regulation; however with climatic warming and increasing wildfire severity, frequency, and area burned, these carbon sinks are at risk. The eastern Georgian Bay region is a diverse landscape of peatlands, upland forests, and rock barrens. A large wildfire burned > 11,000 ha in this region in 2018; differences in organic soil depth were linked to burn severity, where shallow peatlands and peat deposits were more vulnerable to wildfire than deeper peat-filled depressions. To assess vegetation recovery five years after the Parry Sound 33 wildfire, we estimated moss, lichen, and vascular plant cover in four key landscape units (peatland middle, peatland margin, upland forest, rock barrens). Five years post-fire, Polytrichum spp. abundance was greater than fire moss (Ceratodon purpureus) abundance in rock barrens (mean = 25.7% and 6.1%, respectively), and ground cover in upland forests was dominated by Polytrichum spp. (54.1%). Overall Sphagnum moss cover did not differ between peatland margins and middles, yet the abundance by Sphagnum section did, with greater cover of Sphagnum section Sphagnum mosses in peatland middles compared to margins (47.4% and 27.2%, respectively). This poster will discuss vegetation community composition five years post-fire, with a focus on moss recovery and net primary productivity in relation to peat burn severity and site hydrological conditions.