Great Smoky Mountains National Park (GSNP)

Great Smoky Mountains National Park (GSNP)

2011 – present

Great Smoky Mountains National Park supports old-growth and successional stands initiated as recently as the time of park establishment in 1934.  Much of the landscape was logged or farmed into the early 20th century.  Vegetation ranges from hardwood/pine stands at low elevation through northern hardwoods and spruce-fir at the highest elevations.  Moisture gradients span xeric Pine-dominated stands to cove and riparian hardwood sites with especially high tree diversity.  Our plots were established in 2010 to better understand dynamics at higher elevations than we had access to elsewhere in the Southeast.  Paul Super at NPS facilitated permitting and field sampling logistics.

Monthly effective precipitation over the last five years (left) and annual values since 1960 (right). At left are shown winter surpluses in blue and summer deficits in orange. At right are annual anomalies in minimum winter temperature and annual deficit.
tree_years seed_count
amelLaev 198 3
amelUNKN 1008 2
betuLent 12 84
caryOvalGlab 12 0
cornAlte 6 0
faguGran 18 0
fraxAmer 24 2
fraxPenn 12 0
liriTuli 12 0
oxydArbo 6 0
piceRube 6 0
prunSero 354 10
querAlba 54 21
querCocc 0 16
querPrin 186 77
querRubr 342 699
querUNKN 0 255
querVelu 96 5
robiPseu 12 0
tiliAmer 48 54
tsugCana 456 0

GSNP-PK at Purchase Knob is our lowest elevation site in the park, with a mixed hardwood canopy and sparse understory.  It is a 45 min hike from the NPS office at Purchase Knob.  Some trees at this site had tags; we were unable to determine who studied this stand in the past.

Wind damage at Nolan Divide
tree_years seed_count
abieFras 7110 182
amelLaev 72 0
betuAlle 1074 16752
betuLent 84 2866
betuUNKN 0 1143
ilexMont 186 24
piceRube 8220 9138
prunPens 96 0
prunSero 0 36
sorbAmer 1446 0
tsugCana 12 0

GSNP-ND at Nolan Divide is dominated by spruce-fir.  Wind damage is everywhere on this east-facing slope, with interrupted canopy and substantial regeneration.  It is accessed from the road leading up to Clingman’s Dome.

tree_years seed_count
abieFras 1500 3954
piceRube 546 4952

GSNP-CD at Clingman’s Dome is a short-statured spruce-fir stand interrupted by a dense shrub understory.  This stand lies west of the Appalachian trail.

Climate data include our own sensor data here and the compilation of Fridley (2009, J Appl Meteorol Climatol 48:1033).

Circles are proportional to stem diameter. Squares are proportional to seed count. The symbol ‘+’ indicates a seed trap that contained no seeds.

At left are stem and seed trap counts for two years, including Picea rubens and Abies balsamea, at Nolan Divide.  Many Picea are reproductive, with Abies dominating the regeneration stage.

Black bear foraging in mountain ash canopy on Clingman’s Dome.