The potential of forest soils to sequestration atmospheric carbon has both environmental and economic implications. However, there is little information on soil carbon dynamics in response to forest management at the process or microbiotic level. Loblolly pine (Pinus taeda L.) is the major species grown under intensive plantation culture in the southern United States, and estimates of carbon storage in the aboveground woody biomass of these pine forests is accomplished through well established mensuration techniques. Unfortunately, measuring belowground increases in soil carbon pools is problematic, due to variability in carbon forms as well as the spatial and temporal variability of soil microbial activity that is responsible for carbon sequestration or efflux. To achieve a better understanding of how loblolly pine influences soil carbon contents, a greenhouse study using two soil textural classes and two fertilization rates was established to measure soil carbon enrichment via rhizodeposition. This study is being conducted to measure and characterize soil carbon changes under controlled conditions. After six months of growth, some differences in carbon allocation aboveground and belowground across treatments already were observed. Seedlings in a loam medium did not experience greater total biomass production from fertilization. Also, the allocation of carbon to roots, foliage, and stem biomass differed between soil textures and fertility. When changes in soil carbon from loblolly pine rhizodeposition were examined, the loam medium had a slight increase in organic carbon, but the sand medium did not have an enrichment of carbon compared with the controls.