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Based upon these sources, we classified common tree species in the study area into seven classes: soft maple (Acer negundo, Acer saccharinum, Acer pensylvanicum and Acer rubrum) /birch (Betula spp. ), aspen/alder/cottonwood/willow (Populus, Alnus and Salix spp. ), hard maple (Acer saccharum, Acer plantanoides and Acer nigrum)/oak (Quercus spp. )/hickory (Carya spp. )/beech (Fagus spp. ), other hardwood, cedar (Chamaecyparis spp. )/larch (Larix spp. ), spruce (Picea spp.) and pine (Pinus spp.).
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