The Saint John Upland Biophysical Region is part of the Adirondack-New England Mixed Forest-Coniferous Forest-Alpine Meadow Province and the White Mountains Ecoregion Section. There are 3 Forest Provinces, 6 Ecoregion Sections, and 19 Biophysical Regions in Maine.
Province: Adirondack-New England Mixed Forest-Coniferous Forest-Alpine Meadow
The Adirondack-New England Mixed Forest-Coniferous Forest-Alpine Meadow Province has a modified continental climatic regime with long, cold winters and warm summers. Annual precipitation evenly distributed. Landscape is mountainous and was previously glaciated. Forest vegetation is a transition between boreal on the north and broadleaf deciduous to the south.
Ecoregion Section: White Mountains
The White Mountains Section has a maturely dissected, irregular highland characterized by clusters of low, rounded mountains and scattered monadnocks with many glacial features. Rock formations include sedimentary quartzite, slate, and schist with extensive area of igneous rocks including granites, diorite, gabbro, and basalt. Forest vegetation consists of spruce-fir, maple-beech-birch, and aspen-birch cover types.
Biophysical Region: Saint John Upland
The Saint John Upland is 98% forested with the prevalent cover types being a tie with spruce-fir at 46% and maple-beech-birch at 45%.
The top three tree species in this region (based on the stocking of live trees per average forested acre) are:
- Balsam Fir (48 trees per acre)
- Red Spruce (23 trees per acre)
- Northern White Cedar (16 trees per acre)
This graph shows major tree species/species groups, live tree stocking (trees/acre), and how much they contribute to the overall stocking for the Saint John Upland Biophysical Region:
Check out the other 6 bioregions in the Adirondack-New England Mixed Forest-Coniferous Forest-Alpine Meadow Province and the White Mountains Ecoregion Section:
- International Boundary Plateau
- Maine Central Mountains
- White Mountains
- Mahoosuc Rangeley Lakes
- Connecticut Lakes
- Western Maine Foothills