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Stem analysis data collected from dominant and codominant trees growing in loblolly (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) plantations were used to develop site index curves. These data were collected from loblolly and slash pine plantations growing in • Present address: Uplands Research Lab, Great Smoky Mountains National Park, Rt. 2 Box 260, Gatlinburg, TN 37738. the Post Oak Belt of East Texas. The height prediction curves were based on the Chapman-Richards function and will provide an indication of site productivity based an plantation age. South. J. Appl. For. 15(2):97-100. The Post Oak Belt of East Texas is an area of transition between the pine forest to the east and the prairies to the west. This area extends from the Red River southward, contiguous with the western edge of the pine forest and extending into Central Texas (Figure 1). The forests of this zone are dominated by post oak (Quercus stellata Wang.) and blackjack oak (Q. marilandica Muenchh.) in association with other dry site oaks, hickories (Carya spp.), and elms (Ulmus spp.) (Tharp 1939, Daubenmire 1978, Diamond et al. 1987). Pine does occur naturally in some areas of this zone. Loblolly pine (Pinus taeda L.) occurs in Bastrop, Caldwell, and Fayette counties (Tharp 1939). Shortleaf pine (P. echinata Mill.) occurs in isolated natural stands (Wilson and Hacker 1986, Wilson 1989) further to the north in Lamar and Franklin counties. The possibility of converting some of the land to pine has been postulated (Bray 1904, Walker 1972). Indeed, since 1930, many pine plantations were established with the majority between 1950 ;and 1965 (Hansen and Bilan

Site Index Curves for Loblolly and Slash Pine Plantations in the Post Oak Belt of East Texas