Section 14
Chapter 13,806

Radial growth of forest trees in the Georgia Piedmont

Jackson, L.W.R.

Ecology 33(3): 336-341


ISSN/ISBN: 0012-9658
DOI: 10.2307/1932829
Accession: 013805647

Species studied on the Georgia Forestry School exptl. forest at Athens, Georgia, were Pinus echinata, P. taeda, P. carabaea. P. palustris. P. ponderosa. Taxodium distichum, Juniperus virginiana. Ulmus alata. U. parvifolia, Cornus florida, Diospyros virginiana. Acer rubrum, Liquidambar styraciflua. Carya tomentosa. Liriodendron tulipifera, Castanea dentata. Fagus grandifolia. Quercus alba, Q. stellata. Q. borealis and Q. falcata. Radial changes in growth of stem at breast height were measured at 2-week intervals with a Daubenmire type of dendrometer. Results of the study revealed differences in time of start of growth, length of growing season and the minimum number of days required to attain 50% of total seasonal growth. Number of days from Jan. 1 to start of growth ranged from 70-79 days for persimmon to 140-149 days for baldcypress and sweetgum. Minimum number of days required to attain 50% of total growth ranged from 40-49 days for winged elm to 100-109 days for eastern red cedar. Length of growing season or "grand period" ranged from 70-79 days for red maple to 200-209 days for eastern red cedar. Radial growth of the hardwood species was completed by Aug. 29. Growth of the conifers continued until October 2 or 21. Growth of the conifers started as the new shoots began to elongate. Growth of hardwood species did not start until leaves were full grown. A reversal in the trend of radial growth of 13 of the 21 species occurred between July 21 and August 21. This was probably due to shrinkage resulting from the depletion of soil moisture stored from winter and spring rainfall.

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