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Light, moderate, or heavy grazing did not affect total herbage production in rotationally burned slash pine plantations approaching the first pulpwood thinning. However, carpetgrass tended to replace pinehill bluestem in the composition in proportion to grazing intensity. Grazing since tree regeneration has not affected tree crown cover, but heavy grazing reduced tree basal area. Increased tree dominance decreased herbage production, as predicted by earlier studies. Much southern forest range is subjected to concentrated use. The same tract of land is often intensively managed for timber, grazed yearlong, and hunted heavily, year after year. Such management practices as livestock grazing, timber establishment and growth, and prescribed burning often cause major changes in the plant community. Knowing what plant changes to expect will aid planning for effective resource use. Seasonal grazing effects on southern bluestem (Andropogon “pp.) ranges have been reported (Duvall 1962; Duvall and Linnartz 19h7), as have yearlong grazing effects on slash pine (Pinus elliothi) plantations S-10 years old (Pearson and Whitaker 1974b). Several aspects of herbaceous understory-tree overstory relationships have also been studied, including herbage quality (Wolters 1973), prescribed burning (Grelen I97h), and plantation age (Pearson and Whitaker 1974a). This paper reports some effects of grazing and tree overstory development in 13to 16-year old rotationally burned slash pine plantations before their first pulpwood thinning.

Grazing and Overstory Effects on Rotationally Burned Slash Pine Plantation Ranges