TABLE 1.

Summary of species richness and diversity estimates^a

Switchgrass	Time of sampling	Diversity index		Richness index
		Shannon	Simpson	ACE	Chao
None (NIC)	T0	3.69	2.95	411	315
Untreated	Initial enrichment	2.39 ± 0.13	1.76 ± 0.02	261 ± 87	161 ± 43
	Passage 1	2.08 ± 0.18	1.68 ± 0.21	104 ± 22	87 ± 15
	Passage 2	1.94 ± 0.22	1.43 ± 0.14	189 ± 60	125 ± 32
	Passage 3	2.20 ± 0.15	1.77 ± 0.21	143 ± 37	99 ± 11
	Passage 4	1.91 ± 0.06	1.49 ± 0.03	109 ± 52	68 ± 9
	P	<0.022	>0.05	<0.0324	<0.0105
AFEX pretreated	Initial enrichment	2.44 ± 0.23	1.84 ± 0.2	217 ± 113	156 ± 73
	Passage 1	2.21 ± 0.17	1.63 ± 0.12	167 ± 28	87 ± 15
	Passage 2	2.34 ± 0.25	1.80 ± 0.38	132 ± 27	125 ± 32
	Passage 3	2.27 ± 0.16	1.75 ± 0.19	186 ± 127	99 ± 11
	Passage 4	2.30 ± 0.17	1.85 ± 0.25	147 ± 30	68 ± 9
	P	>0.679	>0.812	>0.715	>0.387
IL pretreated	Initial enrichment	1.99 ± 0.06	1.41 ± 0.09	216 ± 95	111 ± 23
	Passage 1	1.48 ± 0.22	0.81 ± 0.25	102 ± 5	91 ± 19
	Passage 2	1.77 ± 0.09	0.98 ± 0.08	179 ± 87	117 ± 47
	Passage 3	1.77 ± 0.13	0.98 ± 0.08	123 ± 65	100 ± 42
	Passage 4	1.49 ± 0.25	0.95 ± 0.35	82 ± 16	64 ± 9
	P	<0.0194	>0.13	>0.142	>0.34

^aThe P values from an analysis of variance are listed.