Table 6. Results of two-way ANOVA of the effect of the clipping treatment (C) and the harvesting seasons (H) (spring, summer, autumn) on the starch concentration and on the relative ¹³C content of the starch of two fine-root classes.

Significant effects (P<0.05) are given in bold. (-: data not available).

Starch	Labelling season	Fine-root class	Clipping (C)			Harvesting season (H)			C x H
			df	F	P	df	F	P	df	F	P
Concentration	-	New roots	1	0.67	0.418	2	25.05	<0.001	2	0.93	0.403
		≤0.5 mm	1	<0.01	0.973	2	6.01	0.005	2	0.32	0.731
Relative 13C content	Spring	New roots	1	2.81	0.116	2	11.87	0.001	2	0.48	0.632
		≤0.5 mm	1	7.13	0.016	2	2.39	0.121	2	0.76	0.483
	Summer	New roots	1	2.58	0.134	1	61.16	<0.001	1	0.84	0.377
		≤0.5 mm	1	0.09	0.771	1	0.67	0.434	1	2.00	0.188
	Autumn	New roots	1	3.00	0.134	-	-	-	-	-	-
		≤0.5 mm	1	0.19	0.668	-	-	-	-	-	-