24 



that could have been sampled for each zone was 17. Some zones were 

 unsuitable for analysis due to disturbance or because they were too 

 narrow to support sampling areas (Appendix A) . Zone 5 was especially 

 susceptible to disturbance. In some cases Zone 5 was cleared because it 

 was dry enough to be farmed during the growing season. In other cases, 

 Zone 5 was too narrow because it was located near the toe of a slope. 

 Therefore, Zone 5 was sampled only at sites 3, 11, 12, and 14. 



FTI numbers were calculated for 74 tree species, 118 species of 

 saplings and shrubs, 31 species of woody vines, and 268 species of herbs 

 and woody seedlings, representing 312 different plant species. Because 

 some species occurred in more than one vegetative layer, the total num- 

 ber of species FTI numbers exceeded the total plant species identified. 



Appendix E contains a listing by stratum of the plant species 

 identified in this study and the calculated FTI numbers with standard 

 deviations provided for each species. 



FTI numbers were calculated for all plants identified by species 

 in this study, regardless of how frequently they occurred in the study. 

 The FTI numbers calculated for species with few occurrences may be sus- 

 pect. FTI numbers for some of the more commonly occurring species in 

 the study are listed in Table 4. These species can generally be found 

 along the moisture gradient in any bottomland hardwood forest in the 

 southeastern United States in roughly the order from wettest to driest 

 community as presented. Some species, such as Nuttall's oak, are common 

 in only part of the region, and not all species can be expected on the 

 same site due to the species' response to other environmental gradients. 



