Abstract
Spruce-fir forests extend along the Appalachian Mountains of eastern North America from 35° to 49° N. This montane vegetation differs from boreal spruce-fir forest in that it is dominated by Picea rubens, has a higher vascular species richness, has wind, rather than fire, dominated dynamics, and has a mean annual temperature above 2 °C. Using field reconnaissance, remote sensing, and literature review we described and modeled the latitude-elevation relationship for Appalachian spruce-fir. The elevation of the sprucefir/deciduous forest ecotone decreases from 1,680 m at 35° N to 150 m at 49° N, while the elevation of treeline (spruce-fir/tundra ecotone) decreases from 1,480 m at 44° N to 550 m at 55° N. Linear regressions gave latitude-elevation relationships of −100 m/lo Latitude for the spruce-fir/deciduous forest ecotone and −83 m/lo Latitude for treeline. These values compare to literature reports of −54 to −230 m/lo Latitude and are most similar to values reported from eastern Asia. The latitude-elevation relationship for eman July temperature ( −94 to −121 m/lo Latitude) was more similar to the slopes of these ecotones than is the slope for mean annual temperature ( −170 to −220 m/lo Latitude). The spruce-fir/deciduous forest ecotone was correlated with a mean July temperature of approximately 17 °C. Treeline was correlated with a mean July temperature of approximately 13 °C.
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Cogbill, C.V., White, P.S. The latitude-elevation relationship for spruce-fir forest and treeline along the Appalachian mountain chain. Vegetatio 94, 153–175 (1991). https://doi.org/10.1007/BF00032629
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DOI: https://doi.org/10.1007/BF00032629