Ordination and Classification of Bottomland Forest in the Lower Mississippi Alluvial Plain


Edward E. Dale, Jr.

Additional Authors:

Stewart Ware and Ben Waitman


June – 2007


Bottomland Forest, Mississippi, Alluvial Plain

Ordination and cluster analysis of 90 sampled bottomland forest stands yielded 12groups of stands (community types). Stands and groups were arranged in a Y-shaped pattern across the ordination. A Quercus nigra group and a Q. phellos group occurred along a “less flooded” arm ofthe Y. A Populus deltoides-Acer negundo group, an A. negundo group, and a Celtis laevigata-Carya illinoensis-Ulmus americana group occurred along the “often flooded, flowing water” arm of the Y, with the last group overlapping a Q. texana-Fraxinus pennsylvanica group near the middle of the ordination. A Liquidambar styraciflua group extended between the “less flooded” and the “flowing water” arms of the Y. The “often flooded, standing water” base of the Y had a Taxodium distichum group and a Nyssa aquatica-Planera aquatica-T. Distichum group, with Cephalanthus occidentalis important in the understory in both groups. Two overlapping groups at the center of the ordination tied together the three arms of the Y. These were a Q. Lyrata group and a Carya aquatica-Forestiera acuminata group. All groups except the Acer negundo group contained stands from multiple locations in two different states, suggesting generality of these combinations of species in this region.