Table 1 P-values for effect of the factors: Time, CO₂ treatment, block, time × CO₂, and time × block, on the biomass (Total, Grasses, and Forbs & Legumes) examined by repeated measures ANOVA.

PFG	Factors	H1			H2
PFG	Factors	1998–2005	2006–2013	1998–2013	1998–2005	2006–2013	1998–2013
Total	Time	0.033^*	0.019^*	0.015^*	0.026^*	0.099	0.051
	CO₂	n.s.	0.108	n.s.	n.s.	0.007^**	n.s.
	Block	0.047^*	n.s.	n.s.	n.s.	0.054	n.s.
	Time × CO₂	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	Time × Block	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
Grasses	Time	0.026^*	0.032^*	0.006^**	0.023^*	0.013^*	0.032^*
	CO₂	0.004^**	0.053	0.005^**	0.016^*	n.s.	0.070
	Block	0.002^**	0.032^*	0.002^**	0.047^*	n.s.	n.s.
	Time × CO₂	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	Time × Block	n.s.	n.s.	n.s.	n.s.	0.039^*	n.s.
Forbs & Legume	Time	0.016^*	0.017^*	0.019^*	0.071	n.s.	0.039^*
	CO₂	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	Block	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	Time × CO₂	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	Time × Block	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.

The effect was assessed for each harvest (H1 and H2) and the rmANOVA model was used at the full time series, as well as the two half time sections as suggested by³⁸. For significant effect at P < 0.05, one asterisk was marked, while for P < 0.01, we use two asterisks. ‘n.s.’ indicated non-significant effect at P > 0.1.

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