Response of understory trees to canopy gaps in a 150-year-old northern hardwood forest

TitleResponse of understory trees to canopy gaps in a 150-year-old northern hardwood forest
Publication TypeJournal Article
Year of Publication1989
AuthorsRoberts MRichard, Jolls CL, Banfield M.E
JournalBulletin of the Ecological Society of America
VolumeSuppl. 70
Pagination244(Abstr
KeywordsUNDERSTORY VEGETATION
Abstract

Twelve natural treefall gaps were studied to determine the role of gaps in the recruitment and growth of tree species in the Colonial Point Hardwoods. Paired 20 m x 20 m plots were placed in each gap and under a standing tree of the same species and diameter as the gapmaker. Understory trees were censused in three height classes: <1m, 1-3 m, and 3-10m. Radial growth after the date of gap formation was measured on increment cores from trees in the 3-10 m class in each plot. For individual species and all species combined, there were no significant differences between gaps and controls in density for any height class (paired sample t-test, p < 0.05). Radial growth was significantly greater in the gaps than in the controls for Fagus grandifolia but not for Acer saccharum (ANOVA, p < 0.05). These results indicate that growth release of exisiting understory trees may occur in gaps but recruitment may not be increased.