Table S1.

Key characteristics of the eddy covariance sites used in the study

AttributeHowland (US-Ho1)Parker Tract (US-NC2)Wind River (US-WRC)
Latitude45.2041°N35.8031°N45.8205°N
Longitude68.7402°W76.66791°W121.9519°W
Dominant speciesHemlock (Tsuga canadensis) and spruce (Picea rubens)Loblolly pine (Pinus taeda)Douglas fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla)
Contribution of deciduous species∼11% by cover∼35–50% by LAI; P. taeda semideciduousNegligible (primarily understory species)
Biomass, t⋅C⋅ha−1120 ± 4740–6594
Peak LAI, m2⋅m−24.54.0–4.38.6
Age, y11018450
Height, m201656
Soil typeGlacial till, fine sandy loamHistosolMesic well-drained loam
Elevation, m603372
MAT, °C5.3179.5
MAP, mm1,0701,3202,450