International Journal of Forestry Research

Research Article

Understory Vegetative Diversity of Post-Thinned Pine Plantations Treated with Fertilizer, Fire and Herbicide in East Texas

Table 5

Site-specific understory measures of alpha diversity, cherokee ridge, and sweet union research sites, east Texas, USA. *significantly different from all other treatments within column; ⁺significantly different from the other site from analysis of various test proc GLM (SAS, ver 8).


Treatment	Shannon index of diversity		Species richness		Species evenness

All plots	Cherokee	Sweet	Cherokee	Sweet	Cherokee	Sweet
All plots	ridge	union	ridge	union	ridge	union

Control	0.91	0.94	16	17	0.76	0.77
Fertilized, unburned	0.73	0.81	16	11*	0.61	0.79
Unfertilized, burned	0.82	0.96	17	18	0.67	0.77
Fertilized, burned	0.79	0.92	17	17	0.66	0.74
Unfertilized, burned, herbicide	0.87	0.91	16	19	0.74	0.73
Fertilized, unburned, herbicide	0.81	0.86	14⁺	17	0.72	0.69
Unfertilized, burned, herbicide	0.88	0.88	18⁺	21*	0.70	0.67
Fertilized, burned, herbicide	0.76	0.91	15	23*	0.65	0.67

Upland plots

Control	1.01*	0.98	18	18	0.80*	0.80
Fertilized, unburned	0.77	0.75*	16	11*	0.65	0.76
Unfertilized, burned	0.73	0.93	16	18	0.61	0.75
Fertilized, burned	0.76	0.92	19	17	0.61	0.74
Unfertilized, burned, herbicide	0.86	0.91	16	19	0.73	0.73
Fertilized, unburned, herbicide	0.78	0.87	14⁺	18	0.69	0.69
Unfertilized, burned, herbicide	0.85	0.78*	18⁺	22*	0.68	0.58*
Fertilized, burned, herbicide	0.81	0.89	16	22*	0.69	0.66*