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  • Hubbard Brook Experimental Forest: Oak seedling demography
  • Cleavitt, Natalie; Cornell University
  • 2023-10-04
  • Cleavitt, N. 2023. Hubbard Brook Experimental Forest: Oak seedling demography ver 1. Environmental Data Initiative. https://doi.org/DOI_PLACE_HOLDER (Accessed 2024-12-28).

  • Marked seedlings. Our dataset includes 1463 marked individual oak seedlings in 535 5m2 plots over the 20 transects. Overall, oak seedlings occurred in a third of the searched plots. Most plots had only one seedling (236 plots) and only 3% (16 plots) of the plots had 10 or more seedlings, with a maximum density of 3.4 seedlings m2. Cohort years 2011, 2015, 2017 and 2022 had a greater influx of seedlings, and our oldest seedling is estimated to be 30 years or older. For seedlings where initial height was measured in their year of germination (i.e., in 2011 or later) mean initial seedling height was 14.8 cm (SD = 6.51 cm) and there was a small but significant decline in initial seedling height with time (-0.23 cm/year, F1,1298 = 19.97, p=<0.0001). The size of first year seedlings as measured by both initial height (F1,760 = 25.2, p<0.001) and leaf number (F1,752 = 11.1, p=0.009) increased on average with distance into the valley. The mean distance of oak seedlings into the valley has not increased over the course of the study and remains centered around 800m from the east entrance.

    Plot environment. Study transects encompassed a full range of topographic positions in the lower valley. Hemlock dominance ranged from absent (5 transects) to dominant (greater than 50% of trees; 3 transects). Tree basal area around the plots ranged from 18.8 – 43.5 m2 ha-1. Light transmission was universally low (all ≤13% TT). Light transmission (F1,5916 = 139.3; r2: 0.157, p<0.0001), hemlock dominance (F1,5916 = 2024; r2: 0.255, p<0.0001), and oak seedling density (F1,5916 = 73.9; r2: 0.126, p<0.0001) all decreased with distance further west into the valley.

    These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.

  • N: 43.959      S: 43.914      E: -71.7022      W: -71.8062
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