Growth of Eucalyptus saligna in a thinning trial at Waipoua.

Authors: M. J. Williamson
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1981, Issue N.Z.J.For. 26(2) 1981, pp 245-250, Aug 1981
Publisher: New Zealand Institute of Forestry

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Abstract: At age 10 years from planting, a stand of Eucalyptus saligna Sm. on a fertile site in Waipoua State Forest in Northland attained a mean height of 26.0 m, and a mean diameter at 1.4 m of 34.3 cm in plots in which stand density had been reduced to 100 stems/ha at age 7 years. In plots with less severe thinning treatments, mean diameters at age 10 years were 29.3 cm. Early heavy thinning thus achieved a good response in diameter growth, but branches were bigger and the green crown lower in the heaviest thinned plots. Mean annual volume increment including bark was estimated to be 35 m3/ha/yr in plots thinned from 760 stems/ha to 400 stems/ha at age 7 years, and then to 200 stems/ha at age 10 years.

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