Table 3.

Results of ANOVA to evaluate relative contribution of substrate, physiognomy and interactions of substrate and physiognomy to explaining variation in NRI and NTI.

		df	Mean square	F-value	Pr > F
NRI	Substrate	1	21.18	3.81	0.0576	NS
	Physiognomy	1	20.48	3.68	0.0617	NS
	Substrate∗physiognomy	1	4.05	0.73	0.3981	NS
	Error	43	5.57
NTI	Substrate	1	0.01	0.00	0.9847	NS
	Physiognomy	1	16.22	6.23	0.0165	∗
	Substrate∗physiognomy	1	1.03	0.40	0.5320	NS
	Error	43	2.60

^∗p < 0.05.