BLM REA CYR 2013 Current Distribution of Lowland Woody Wetland

Some of the CYR rasters intentionally do not align or have the same extent. These rasters were not snapped to a common raster per the authors' discretion. Please review selected rasters prior to use. These varying alignments are a result of the use of differing source data sets and all products derived from them. We recommend that users snap or align rasters as best suits their own projects. - The Lowland Woody Wetland CE occurs throughout the boreal regions of Alaska on flat to gently sloping valley bottoms, abandoned floodplains, and other lowland terrain. Soils are poorly drained, acidic, nutrient poor, and often have a well-developed peat layer. Permafrost is discontinuous with extensive thermokarst. This CE is characterized by coniferous wetlands and associated sedge-shrub bogs and fens forming a mosaic of forested and non-forested wetland types. Picea mariana is the dominant conifer, though Larix laricina may be locally common, especially on less acidic sites. The tree canopy is typically 10–30%, and trees are stunted and slow-growing. The shrub canopy is composed of low and dwarf shrubs including Rhododendron groenlandicum, Rhododendron tomentosum, Andromeda polifolia, Betula nana, B. glandulosa, Empetrum nigrum, Vaccinium vitis-idaea, V. uliginosum, Dasiphora fruticosa, and Chamaedaphne calyculata. Sedges and cottongrass are often abundant the understory andinclude Carex bigelowii, C. pluriflora, Eriophorum vaginatum, E. angustifolium. Other common herbaceous species are Rubus chamaemorus, Calamagrostis canadensis, and Equisetum spp. The moss layer is continuous and typically includes Sphagnum spp., Hylocomium splendens, and Pleurozium schreberi. Lichens, such as Cladina spp., are common in older stands. Lowland woody wetland was derived from the Woody Wetlands class of the National Landcover Database (2011). Lowland woody wetland is a current distribution dataset.