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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