Monday, 6 February 2006 - 3:30 PM

This presentation is part of: Soils--II

Sustainability of Planted Loblolly Pine on a Remediated Brine-Contaminated Soil.

Benjamin C. McNally and Kenneth W. Farrish. Stephen F. Austin State University, P.O. Box 6109, SFA Station, Nacogdoches, TX 75962-6109

Oilfield brines are considered one of the most recognized forms of nonpoint source pollution in the oil producing areas of the United States. The primary effects of brine contaminating lands are the degradation of soil structure and the alteration of the osmotic gradient that normally occurs between plant roots and the soil. The accumulated salts in the soil reverse the osmotic gradient that exists between the soil and plant roots. In severe cases this activity can cause the established plants to die due to the roots being unable to uptake water and nutrients. The deficiency of plant life will result in a salt scar that is expensive to remediate. The brine contaminated soils suffer long-term effects on its physicochemical properties such as changes in sodium adsorption ratio (SAR), soil reaction (pH), infiltration rate (IR), bulk density (BD), hydraulic conductivity, and electrical conductivity (EC). The contaminated soils are then more susceptible to erosion and compaction due to the dispersion of the soil matrix. Remediated efforts have been established on an oilfield brine contaminated site in Springhill, Louisiana there are concerns for the sustainability of the planted loblolly pines. The survival and growth of the pine seedlings might be negatively effected by the possible migration of Na+ ions to the upper portions of the soil profile through evapotranspiration and decreased amount of infiltrating water. A proposed study is monitoring the health and growth of the planted pines for two years, and monitoring soil conditions for one complete season. The monitoring effort will relate soil parameters such as electrical conductivity (EC), sodium adsorption ratio (SAR), organic matter content, and pH to the overall survival and growth of the planted loblolly pine. In addition sodium uptake will be determined in the loblolly pines.


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