Shi-Jean Susana Sung
Research Plant Physiologist
2500 Shreveport Highway
Pineville, LA 71360
Contact Shi-Jean Susana Sung
The primary thrust of current research is in the areas of longleaf pine seedling production, field establishment, and field performance with emphasis on root system architecture, sapling physical stability (e.g., wind firmness), stem sinuosity, and physiologcial and growth response to prescribed burns. The long-term effects of container types and sizes on longelaf pine are being evaluated. Different strategies including nursery fertilization rate and site preparation methods are being explored to enhance the acceleration of stem growth to reduce resisdence time of the grass stage. Effects of sivilcultural management practices are studied on longleaf pine, slash pine and Ponderosa pine stands.
- Physiology of forest species including longleaf pine, Ponderosa pine, oaks, and American chestnut.
- Seedling and tree root system architecture.
- Tree responses to climate changes such as drought, flood, and heat and infestation of insects and diseases.
- Physiology, biochemistry, morphology, and silviculture of loblolly pine, sweetgum, northern red oak, white oak, souther red oak, and cherrybark oak.
- Nursery protocols and artificial regeneration strategies for loblolly pine and several oak species.
- The seasonal dynamics of carbon sink and source relationship in loblolly pine, oaks, sweetgum, and longleaf pine.
- The adaptive and maintenance intermediately sugar metabolic pathways in agriculture and horticulture crops and forest trees.
- Phosphorus fertilization and mycorrhizal colonization in pines and sweetgum.
- Herbicides and weed biology.
Why This Research is Important
With increasing interests from the public and private sectors of forest professionals and land owners to restore, improve, and maintain longleaf pine ecosystems in its natural range across southern U.S, many aspects of longelaf biology and physiology are either unknown or mis-leading. For example, a longleaf pine seedling can emerge from the grass stage (> 12 cm in height) within 1 to 4 years after planting. Seedlings tend to stay in the grass stage longer if they are shaded by competing vegetation. Restoration has to come from the artificial regeneration if there is no longleaf on site or the natural regeneration is not feasible. Although more than 85% of longleaf pine planted is from the container stock, there remain many issues with container-grown stock. Sapling windfirmness, or lack of it, is one. Bareroot seedlings have a narrow window of planting (< 7 days from lifting) and survive poorly in drought. But they possess a root system similar to that of the naturally regenerated seedlings and are more wind firm compared to the container stock.
- Auburn University, Ph.D. Agronomy and Soils, 1982
- Virginia Polytechnic Institute and State University, M.S. Plant Physiology and Weed Science, 1977
- National Chung-Hsing University, Taichung, Taiwan, B.S. Botany, 1975
Featured Publications & Products
- Sword Sayer, Mary Anne; Sung, Shi-Jean Susana; Haywood, James D. 2011. Longleaf Pine Root System Development and Seedling Quality in Response to Copper Root Pruning and Cavity Size.
- Leduc, Daniel J.; Haywood, James D.; Sung, Shi-Jean Susana. 2011. Comparing Planting Tools for Container Longleaf Pine.
- Sung, Shi-Jean Susana; Kormanik, Paul P.; Zarnoch, Stanley J. 2010. White oak epicotyl emergence and 1-0 seedling growth from surgically altered germinating acorns.
- Sung, Shi-Jean Susana; Haywood, James D.; Sword-Sayer, Mary A.; Connor, Kristina F.; Scott, D. Andrew. 2010. Effects of container cavity size and copper coating on field performance of container-grown longleaf pine seedlings.
- Otrosina, W. J.; Kliejunas, J. T.; Sung, S. S.; Smith, S.; Cluck, D. R. 2008. Studies on black stain root disease in ponderosa pine. pp. 236-240. M. Garbelotto & P. Gonthier (Editors). Proceedings 12th International Conference on Root and Butt Rots of Forest Trees..
Publications & Products
- Haywood, James D.; Leduc, Daniel J.; Sung, Shi-Jean S. 2013. Comparing seven planting tools for container-grown longleaf pine seedlings.
- Sung, Shi-Jean Susana; Zarnoch, Stanley J.; Haywood, James D.; Leduc, Daniel; Sword-Sayer, Mary A. 2013. Developmental dynamics of longleaf pine seedling flushes and needles.
- Leduc, Daniel J.; Sung, Shi-Jean S.; Wharton, Kristi. 2012. Assessing the leaning, bending, and sinuosity of sapling-size trees.
- Haywood, James D.; Sung, Shi-Jean Susana; Sword Sayer, Mary Anne. 2012. Copper Root Pruning and Container Cavity Size Influence Longleaf Pine Growth through Five Growing Seasons.
- Sung, Shi-Jean S.; Leduc, Daniel J.; Haywood, James D.; Eberhardt, Thomas L.; Sword Sayer, Mary Anne; Zarnoch, Stanley J. 2012. Methodology and preliminary results of evaluating stem displacement and assessing root system architecture of longleaf pine saplings.
- Black, Clayton C.; Sung, Shi-Jean S.; Toderich, Kristina; Voronin, Pavel Yu. 2010. Applying photosynthesis research to increase crop yields.
- Connor, K.F.; Brockway, D.G.; Haywood, J.D.; Goelz, J.C.G.; Sword-Sayer, M.A.; Sung, S-JS.; Walker, J.L. 2007. Restoring and managing longleaf pine ecosystems in the southern United States: Southern Research Station Unit SRS-4158.
- Kormanik, Paul P.; Sung, Shi-Jean S.; Kormanik, Taryn L. 2004. Growing, selecting, and establishing 1-0 Quercus rubra and Q alba seedlings for rapid growth and early acorn production on forested lands in the southeastern United States..
- Kormanik, Paul P.; Sung, Shi-Jean S.; Kormanik, Taryn L.; Zarnoch, Stanley J.; Schlarbaum, Scott E.; Tibbs, Tom. 2002. Artificial regeneration of northern red oak (Quercus rubra) on high quality mesic sites: early results characterizing nursery production, early juvenile growth, and acorn production.
- Kormanik, Paul P.; Sung, Shi-Jean S.; Zarnoch, Stanley J.; Tibbs, G. Thomas. 2002. Artificial regeneration of northern red oak and white oak on high-quality sites: effect of root morphology and relevant biological characteristics.
- Otrosina, William J.; Sung, Shi-Jean S.; Zarnoch, Stanley J.; Sullivan, Brian T.; Walkinshaw, Charles H. 2002. Root disease and other unforeseen variables that confound restoration efforts.
- Kormanik, Paul P.; Kormanik, Taryn L.; Sung, Shi-Jean S.; Zarnoch, Stanley L. 1999. Nitrogen levels, top pruning, and lifting date affect nursery development and early field performance of loblolly pine seedlings.
- Kormanik, Paul P.; Muse, H.D.; Sung, S.J. 1991. Impact of nursery management practices on heritability estimates and frequency distributions of first-order lateral roots of loblolly pine..