Table 1 Analysis of variance results of total plant biomass, plant shoot biomass, plant root biomass, plant survival, biomass of gram-positive bacteria, biomass of gram-negative bacteria, biomass of fungi, phenol oxidase activity, polyphenol oxidase activity, and total PAHs residuals as affected by CO₂, O₃, plant functional group richness (FGR), and all interactions.

	CO₂		O₃		FGR		CO₂ × O₃		CO₂ × FGR		O₃ × FGR		CO₂ × O₃ × FGR		Error df
	F-value	P-value	F-value	P-value	F-value	P-value	F-value	P-value	F-value	P-value	F-value	P-value	F-value	P-value	Error df
Total plant biomass	0.55	0.458	5.55	0.020	3.30	0.041	0.06	0.806	1.42	0.244	0.34	0.707	0.86	0.428	100
Plant shoot biomass	0.02	0.896	6.39	0.013	4.18	0.018	0.39	0.534	1.34	0.267	0.62	0.541	1.32	0.270	100
Plant root biomass	1.96	0.165	4.09	0.046	2.42	0.094	<0.01	0.934	1.27	0.285	0.18	0.836	0.44	0.642	100
Plant survival	<0.01	0.931	3.80	0.054	4.88	0.010	4.27	0.041	0.24	0.786	1.03	0.362	0.66	0.518	100
Gram-positive bacteria	6.39	0.013	45.72	<0.001	7.92	<0.001	11.63	0.001	3.09	0.032	2.12	0.104	1.06	0.371	82
Gram-negative bacteria	0.06	0.815	7.72	0.007	11.82	<0.001	1.92	0.169	2.17	0.097	0.91	0.441	0.53	0.666	82
Fungi	0.61	0.437	2.89	0.093	3.37	0.022	0.01	0.906	0.95	0.419	1.91	0.135	0.92	0.437	82
Phenol oxidase activity	1.94	0.167	0.21	0.646	3.91	0.012	15.58	<0.001	1.69	0.176	2.77	0.047	2.92	0.039	80
Polyphenoloxidase activity	17.38	<0.001	70.11	<0.001	137.96	<0.001	22.18	<0.001	4.66	0.005	1.92	0.133	0.32	0.814	80
Total PAHs	79.37	<0.001	59.41	<0.001	0.31	0.818	42.95	<0.001	0.13	0.944	0.45	0.718	1.84	0.147	79

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