Table 3.

Repeated measures analysis of the effect of functional group presence on the amount of N in total plant biomass. (Significant p-values are in bold. All significant effects are positive. A similar repeated measures analysis including all two-way interactions between functional groups did not reveal any additional interactions.)

	total plant N
effect	p-value	F	d.f.	den d.f.
C3 grasses	0.9323	0.01	1	157
C4 grasses	0.0077	7.3	1	157
forbs	0.8497	0.04	1	157
legumes	<0.0001	148.1	1	157
L×C4	0.5903	0.3	1	157
year (Y)	<0.0001	53.7	3.62	568.7
Y×C3	0.7984	0.4	3.62	568.7
Y×C4	0.0253	2.9	3.62	568.7
Y×F	0.7666	0.4	3.62	568.7
Y×L	<0.0001	25.4	3.62	568.7
Y×L×C4	0.0449	2.5	3.62	568.7