Table 1.

Summary of the influence of monoculture species (Species), competition treatment: (mono or mix) and root order (1–5 Order) and their interactions on the root respiration, N, C/N ratio, root length, specific root area (SRA), specific root length (SRL), root diameter, root order biomass per branch, Cortical thickness, stele diameter and cortical stele ratio.

Source of variation	df	F	P	F	P	F	P	F	P	F	P	F	P
		Respiration		N		C/N		Length		SRL		SRA
Treatment	1	8.119	<0.047	2.629	0.119	1.656	<0.098	94.523	<0.001	47.192	<0.001	2.362	0.132
Species	1	478.743	<0.001	52.244	<0.001	82.058	<0.001	289.599	<0.001	41.798	<0.001	41.793	<0.001
Order	4	393.81	<0.000	248.977	<0.001	180.628	<0.001	681.321	<0.001	299.442	<0.001	44.458	<0.001
Treatment* species	1	3.826	<0.148	0.003	0.96	0.077	<0.62	6.417	<0.015	2.659	<0.111	3.183	0.082
Treatment* order	4	1.053	0.392	0.278	0.891	1.113	0.097	27.717	<0.001	5.859	<0.001	0.757	0.559
Species* order	4	18.568	<0.021	1.945	0.122	13.349	<0.001	76.939	<0.001	48.973	<0.001	7.315	<0.001
Treatment* species* order	4	2.829	<0.037	3.284	<0.020	5.239	<0.002	7.109	<0.001	2.479	0.059	0.363	0.834
		Diameter		Biomass/branch		Cortical thickness		Stele		Cortical stele ratio
Treatment	1	1.445	<0.931	72.149	<0.001	0.062	0.803	0.138	0.71	0.243	0.623
Species	1	36.595	<0.001	730.251	<0.001	55.555	<0.001	753.007	<0.001	131.951	<0.001
Order	4	215.773	<0.001	81.998	<0.001	0.013	0.908	76.604	<0.001	6.115	<0.015
Treatment* species	1	1.563	0.218	78.176	<0.001	0.909	0.342	1.861	0.174	0.598	0.441
Treatment* order	4	2.383	<0.326	17.861	<0.001	0.087	0.769	2.236	0.137	0.037	0.848
Species* order	4	4.674	<0.003	64.162	<0.001	2.528	0.114	60.046	<0.001	14.504	<0.001
Treatment* species* order	4	1.871	<0.312	15.06	<0.001	1.924	0.167	0.103	0.748	1.048	0.308

Shown are the degrees of freedom (df), F and P values (P < 0.0001, P < 0.001, P < 0.05,) of the respective variables and variables with significant influence are printed in bold (P < 0.05).