Table 1

	Colonization Structure
	Vesicles				Arbuscules
Effect	Variance Component	Error df	F	p	Variance Component	Error df	F	p
Date	0.002	10	6.88	0.003	0.002	10	2.98	0.050
Site	0.000	9	0.96	0.354	0.001	10	7.99	0.019
Sample(Site)	< 0.001	290	1.98	0.097	< 0.001	290	1.32	0.263
Subsample(Sample)	0.000	290	0.94	0.501	0.000	290	0.50	0.889
Date x Site	< 0.001	290	3.08	0.001	0.001	290	4.86	< 0.001
Residual	0.003				0.005
	Hyphae				Total
Effect	Variance Component	Error df	F	p	Variance Component	Error df	F	p
Date	0.006	10	4.88	0.010	0.006	10	4.99	0.009
Site	< 0.001	10	2.83	0.122	< 0.001	11	2.62	0.134
Sample(Site)	< 0.001	290	1.54	0.191	< 0.001	290	1.99	0.096
Subsample(Sample)	0.000	290	0.62	0.797	0.000	290	0.46	0.916
Date x Site	0.003	290	7.48	< 0.001	0.003	290	7.11	< 0.001
Residual	0.006				0.006

Table 1: Analysis of variance for effects of date, site, sample, subsample, and date x site interaction on percent root colonization of cheatgrass by AMF structures.