Six hardwood tree species (Betula papyrifera, Populus tremuloides, Acer saccharum, Fagus grandifolia, Pinus strobus, Prunus serotina)

Sefcik, L.T., Zak, D.R. and Ellsworth, D.S. 2007. Seedling survival in a northern temperate forest understory is increased by elevated atmospheric carbon dioxide and atmospheric nitrogen deposition. Global Change Biology 13: 132-146.

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