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 OJF  Vol.2 No.3 , July 2012
Crown Ratio and Relative Spacing Relationships for Loblolly Pine Plantations
Abstract: Two loblolly pine (Pinus taeda L.) culture/density studies were established in 1995-1998 across the Lower Coastal Plain and Upper Coastal Plain/Piedmont regions of the southern USA. Each installation contains 12 plots of loblolly pine planted at six levels of density from 741 to 4448 trees/ha in combination with two levels of cultural intensity, operational and intensive. The data from 37 viable installations were used to evaluate the crown ratio and relative spacing relationship of loblolly pine plantations. The effects of planting density, site quality, and cultural intensity on the relationship were investigated with a nonlinear mixed-effects modeling approach. The crown ratio and relative spacing relationship is exceedingly predictable. When loblolly pine plantation stands reached the average live crown ratio of 0.40, a critical point representing a generally acceptable level of tree vigor, the corresponding relative spacing index ranged from 0.11 to 0.20, mainly depending on initial planting density. The information about the crown ratio and relative spacing relationship would be useful for selecting the best intensity and timing of thinning.
Cite this paper: Zhao, D. , Kane, M. & Borders, B. (2012). Crown Ratio and Relative Spacing Relationships for Loblolly Pine Plantations. Open Journal of Forestry, 2, 101-115. doi: 10.4236/ojf.2012.23014.
References

[1]   Bennett, F. (1955). The effect of pruning on the height and diameter growth of planted slash pine. Journal of Forestry, 53, 636-638.

[2]   Dean, T. J. (1999). Using live-crown ratio to control wood quality: An example of quantitative silviculture. In J. D. Haywood (Ed.), Pro

[3]   ceedings of the Tenth Biennial Southern Silvicultural Research Con

[4]   ference (pp. 511-514). Asheville, NC: US Forest Service Southern Research Station.

[5]   Dean, T. J., & Baldwin, V. C. Jr. (1993). Using a density-management diagram to develop thinning schedules for loblolly pine plantations. Juneau, AK: USDA Forest Service.

[6]   Dean, T. J., & Baldwin. V. C. Jr. (1996). Growth in loblolly pine plan-tations as a function of stand density and canopy properties. Forest Ecology and Management, 82, 49-58. doi:10.1016/0378-1127(95)03694-6

[7]   Demers, C., Long, A., & Nowak, J. (2005). Thinning southern pines— A key to greater returns. Gainesville, FL: University of Florida, In

[8]   stitute of Food and Agricultural Science, Florida Cooperative Exten

[9]   sion Service.

[10]   Drew, T. J., & Flewelling, J. W. (1979). Stand density management: An alternative approach and its application to Douglas-fir plantations. Forest Science, 25, 518-532.

[11]   Dyer, M. E., & Burkhart, H. E. (1987). Compatible crown ratio and crown height models. Canadian Journal of Forest Research, 17, 572-574. doi:10.1139/x87-096

[12]   Harrington, T. B. (2000). Silvicultural approaches for thinning south

[13]   ern pines: method, intensity, and timing. Macon, GA: Georgia For

[14]   estry Commission.

[15]   Harrison, W. M., & Kane, M. (2008). PMRC Coastal Plain culture/ density study: Age 12 analysis. Athens, GA: University of Georgia, Warnell School of Forestry and Natural Resources.

[16]   Hasenauer, H., & Monserud, R. A. (1996). A crown ratio model for Austrian forests. Forest Ecology and Management, 84, 49-60. doi:10.1016/0378-1127(96)03768-1

[17]   Kanazawa, Y., Kiyono, Y., & Fujimori, T. (1985). Crown development and stem growth in relationship to stand density in even-aged pure stands (II): Clear-length model of Crytomeria japonica stands as a function of stand density and tree height. Journal of the Japanese Forest Society, 67, 391-397.

[18]   Kanazawa, Y., Kiyono, Y., & Fujimori, T. (1990). Relationship be

[19]   tween canopy depth and other dimensions of coastal Pinus thunbergii Parlat. forests in Japan. Tree Physiology, 7, 317-327.

[20]   Leites, L. P., Robinson, A. P., & Crookston, N. L. (2009). Accuracy and equivalence testing of crown ratio models and assessment of their impact on diameter growth and basal area increment predictions of two variants of the Forest Vegetation Simulator. Canadian Jour

[21]   nal of Forest Research, 39, 655-665. doi:10.1139/X08-205

[22]   Long, J. N. (1985). A practical approach to density management. For

[23]   estry Chronicle, 61, 23-17.

[24]   Monserud, R. A., & Sterba, H. (1996). A basal area increment model for individual trees growing in even

[25]   and uneven-aged forest stands in Austria. Forest Ecology and Management, 80, 57-80. doi:10.1016/0378-1127(95)03638-5

[26]   Newton, P. F. (2009). Development of an integrated decision-support model for density management within jack pine stand-types. Eco

[27]   logical Modelling, 220, 3301-3324. doi:10.1016/j.ecolmodel.2009.07.025

[28]   Parker, R. C. (1978). Investigations into the limits of stand density. Ph.D. Thesis, Athens, GA: University of Georgia.

[29]   Pinheiro, J. C., & Bates, D. M. (2000). Mixed-effects models in S and S-PLUS. New York: Springer-Verlag. doi:10.1007/978-1-4419-0318-1

[30]   Smith, D. M. (1988). The practice of silviculture. New York: John Wiley.

[31]   Temesgen, H., LeMay, V., & Mitchell, S. J. (2005). Tree crown ratio models for multi-species and multi-layered stands of southeastern British Columbia. Forestry Chronicle, 81, 133-141.

[32]   Wilson, F. G. (1946). Numerical expression of stocking in term of height. Journal of Forestry, 44, 758-761.

[33]   Wilson, F.G. 1979. Thinning as an orderly discipline: A graphic spac

[34]   ing schedule for red pine. Journal of Forestry, 77, 483-486.

[35]   Zhao, D., Kane, M., & Harrison, W. M. (2008). SAGS culture/density study: Results through age 10. Athens, GA: University of Georgia, Warnell School of Forestry and Natural Resources.

[36]   Zhao, D., Kane, M., & Borders, E. B. (2010). Development and appli

[37]   cations of the relative spacing model for loblolly pine plantations. Forest Ecology and Management, 259, 1922-1929. doi:10.1016/j.foreco.2010.02.003

[38]  

 
 
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