Temporal changes in growth-layer patterns of plantation-grown red oak and red pine

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Abstract
The radial and longitudinal patterns of ring width were examined in the stems of dominant and intermediate red oak (Quercusrubra L.) and red pine (Pinusresinosa Ait.) in a 50-year-old plantation on a fine sandy soil. Patterns in red pine conform to those of plantation-grown conifers, which are characterized by a marked difference in width between the upper (maximum width) and lower (minimum width) parts of the growth layer. Except for the first decade from planting, overall patterns in the oak differed from those of the pine, and this is attributed primarily to differing branch development. Longitudinal changes in width were much less in the oak growth layers, so radial and ring-number sequences were relatively similar. Periods of reduced height increment in the oak, which were not as evident in the pine, tended to be associated with a reduction in ring width in the upper stem relative to the lower stem.
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