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Cherrybark oak 7-year growth response in intermixed species, competitive neighborhoods

Author(s):

Martin R. Schubert
Wayne K. Clatterbuck
John M. Zobel

Year:

2020

Publication type:

General Technical Report (GTR)

Primary Station(s):

Southern Research Station

Source:

e–Gen. Tech. Rep. SRS–253. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station

Description

In 2009, 6.5 acres on the University of Tennessee’s Cumberland Forest in Morgan County, TN, were identified for hardwood afforestation. Twenty-seven plots were planted in one of three species of hardwoods: yellow-poplar (Liriodendron tulipifera), black cherry (Prunus serotina), and sweetgum (Liquidambar styraciflua) at three spacings. Cherrybark oak (Quercus pagoda) was intermixed in these plantings such that each oak was completely surrounded by a competitor species. These unique, species-specific neighborhoods act on oak growth and development particular to variations in competitor crown architecture. After 7 years, oak survival ranged from 84.8 percent in 6-foot by 6-foot sweetgum plots to 100 percent survival in the 10-foot by 10-foot yellow-poplar plots. Oak diameter at breast height (d.b.h.) showed significant effects within spacing (p = 0.0002) and species (p = 0.0015), but not their interaction (p = 0.9110). Total mean cherrybark oak d.b.h. was 1.6 inches, ranging from 1.4 inches in the 6-foot by 6-foot yellow-poplar plots to 2.17 inches in the black cherry 10-foot by 10-foot plots. There were significant effects of spacing on cherrybark oak height growth (p = 0.0164) but no significant differences at the species level (p = 0.2410) or in the interaction of spacing and species (p = 0.7451). Comparisons of mean plot heights by spacing indicates significant cherrybark oak height differences between the 10-foot by 10-foot spacing (16.6 feet) and the 6-foot by 6-foot spacing (13.4 feet; p = 0.0091) but not between the 6-foot by 6-foot and 8-foot by 8-foot (14.9 feet; p = 0.3901) or the 8-foot by 8-foot and 10-foot by
10-foot spacings (p = 0.2905).

Citation

Schubert, Martin R.; Clatterbuck, Wayne K.; Zobel, John M. 2020. Cherrybark oak 7-year growth response in intermixed species, competitive neighborhoods. In: Bragg, Don C.; Koerth, Nancy E.; Holley, A. Gordon, eds. 2020. Proceedings of the 20th biennial southern silvicultural research conference. e–Gen. Tech. Rep. SRS–253. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 193-199.

Publication Notes

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  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
https://www.fs.usda.gov/treesearch/pubs/61481