Relationship of Forest Vegetation to Soils on Geological Formations of the Oklahoma Gulf Coastal Plain

Portions of this paper were recently presented at the Cross Timbers Symposium at the Botany 2005 Symposium in Austin, Texas. I have come to realize the importance of this data as a baseline for the composition of forests in the Gulf Coastal Plain. Since the data were collected about 40 years ago, many changes have occurred including our expanding population, increase in rural housing, construction of pipelines, and clearing for pasture and cultivation. Many of the sites studied have been modified or completely disappeared. Another important change is the tremendous expansion of Juniperus virginiana (red cedar) due to absence of fire. In the sampling of these 13 forests 40 years ago, this species was found in only one stand, and as a sapling. Other invasive plants include Ligustrum sinense (privet), an evergreen shrub that can expand into clones by underground roots, and the invasive vine Lonicera sempervirens (Japanese honeysuckle) which is controlled in many areas by cattle grazing. Both of these species will continue to expand and affect our native flora.