Several methods are used to assess tree regeneration at HRF. We have sampled regeneration at several plot sizes with different strategies and size classes.
200 m² and 4 m² plots located on quadrat centers. In 200 m² plots all trees (saplings) 1.5-9.5 cm DBH are counted by species, condition and 1 cm size class. In 4 (located N, E, S, W) 4 m² plots all trees (seedlings and saplings) <1.5 cm DBH are counted by size class. Size classes are <0.1m tall; 0.1 – 0.49m tall; 0.5 – 2m tall; and >2m tall & <1.5cm DBH.
25 m² plots are located in 1997 canopy gaps and under canopy in similar soil types at the location of 1m² relevé plots (see Schumann, et al., 2003). All trees were counted by species and size class which included 0.5 – 2m tall; >2m tall & <1.5cm DBH; and one cm DBH classes from 1.5-9.5 cm. Additionally an assessment of damage is conducted, primarily focused on deer browsing but also insect damage such as white pine weevil.
S-10 plots are located in two west to east strips across the study area in the E and I blocks. Each strip is 10×600 m. Within this area all saplings (1.5-9.5 cm DBH) identified by species are measured and mapped to produce X,Y coordinates for each stem.
S-1 plots are the southernmost 1 m of the S-10 plots. The size classes measured are the same as 4 m² plots. Counts are completed each year in late July/early August at every 5th plot.