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Table 1 Drought tolerance classes for common tree species of the Northeastern U.S. as described in Niinemets and Valladares (2006), Gustafson and Sturtevant (2013), and Peters et al. (2015)

From: Are Northeastern U.S. forests vulnerable to extreme drought?

Species Drought tolerance
Niinemets and Valladares (2006)
(Numeric scale 1 to 5)
Gustafson and Sturtevant (2013)
(No numeric scale)
Peters et al. (2015)
(Numeric scale − 3 to 3)
Abies balsamea Very intolerant (1.0) Somewhat intolerant Intolerant (− 2)
Acer rubrum Intolerant (1.8) Somewhat tolerant Somewhat tolerant (1)
Acer saccharum Intolerant (2.3) Somewhat tolerant Somewhat intolerant (− 1)
Betula allegheniensis Somewhat tolerant (3.0) Somewhat intolerant Somewhat intolerant (− 1)
Betula lenta Somewhat tolerant (3.0) Intolerant (− 2)
Betula papyrifera Intolerant (2.0) Intolerant Intolerant (− 2)
Carya ovata Somewhat tolerant (3.0) Somewhat intolerant (− 1)
a Castanea dentata Somewhat tolerant (3.0) Somewhat tolerant (1)
Fagus grandifolia Intolerant (1.5) Somewhat intolerant (− 1)
Fraxinus americana Intolerant (2.4) Somewhat tolerant Somewhat intolerant (− 1)
Fraxinus nigra Intolerant (2.0) Intolerant Intolerant (− 2)
Fraxinus pennsylvanica Tolerant (3.9) Somewhat intolerant (− 1)
Larix laricina Intolerant (2.0) Somewhat tolerant Somewhat tolerant (1)
Picea glauca Somewhat tolerant (2.9) Somewhat intolerant Somewhat intolerant (− 1)
Picea mariana Intolerant (2.0) Somewhat tolerant Intolerant (− 2)
Picea rubens Somewhat tolerant (2.5) Tolerant Intolerant (− 2)
Pinus banksiana Tolerant (4.0) Tolerant Tolerant (2)
Pinus strobus Intolerant (2.3) Tolerant Very intolerant (− 3)
Populus grandidentata Somewhat tolerant (2.5) Intolerant Intolerant (− 2)
Populus tremuloides Intolerant (1.8) Intolerant Intolerant (− 2)
Prunus serotina Somewhat tolerant (3.0) Somewhat tolerant Tolerant (2)
Quercus alba Tolerant (3.6) Tolerant Somewhat tolerant (1)
Quercus rubra Somewhat tolerant (2.9) Tolerant Somewhat tolerant (1)
Quercus velutina Somewhat tolerant (3.0) Tolerant (2)
Thuja occidentalis Somewhat tolerant (2.7) Somewhat intolerant Intolerant (− 2)
Tilia americana Somewhat tolerant (2.9) Somewhat tolerant Somewhat intolerant (− 1)
Tsuga canadensis Very intolerant (1.0) Somewhat intolerant Intolerant (− 2)
a Ulmus americana Somewhat tolerant (2.9) Intolerant (− 2)
  1. aSpecies that were common to the Northeastern U.S. prior to twentieth century, but are less common due to widespread mortality caused by fungal diseases
  2. Numeric scales are listed below each citation, and scores are listed in parenthesis if provided. Tolerance classifications and scores for Niinemets and Valladares (2006) and Peters et al. (2015) were obtained from appendices, and tolerance classifications for Gustafson and Sturtevant (2013) were obtained directly from the paper (see Table 2). We revised tolerance classifications of Niinemets and Valladares (2006) by replacing the term “moderately” with “somewhat” to maintain consistency among studies