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DIVISION S-7—FOREST & RANGE SOILS

Root Development of Young Loblolly Pine in Spodosols in Southeast Georgia

^a 165 Boulevard Hébert, Université de Moncton—Campus d'Edmundston, Edmundston, New Brunswick E3V 2S8 Canada
^b Soil and Water Science Dep., 2169 McCarty Hall, Univ. of Florida, P.O. Box 110290, Gainesville, FL 32611-0290
^c School of Forest Resources and Conservation, Univ. of Florida, Gainesville, FL 32611
^d Departamento do Solos, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-000 Brazil

^* Corresponding author (nbc{at}mail.ifas.ufl.edu).

Determining fine-root dynamics is fundamental to forest soil nutrient management yet root development of fast-growing loblolly pine (Pinus taeda L.) is poorly documented. The objectives of this study were to (i) investigate the spatial and temporal root development of loblolly pine; (ii) evaluate the relationship between root length, number of roots exiting a trench face, and root mass densities; and (iii) determine if there is a relationship between fine root and foliage mass as well as root and shoot mass during the early stages of stand development. Thirteen forest sites in southeastern Georgia covering ages 1 to 4 yr old were used. Roots temporal and spatial distributions were investigated using a trench method. The value of N_X (# roots cm^–2) was measured in August/September during the first 4 yr of stand development. Root density depth distributions fit a natural logarithm relationship with soil depth. An empirical model for root development over time was developed. A two-dimensional evaluation of root development showed that roots were present in 13 to >60% of the soil volume from Year 1 to Year 4. Regressions between root length density, L_V (cm root cm^–3 soil), and N_X were weak until root mass and soil depth were included. Lastly, it was shown that the ratio of fine root mass/foliage mass was stable after the establishment phase, as was the ratio of root to shoot.

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