Relationships of climate and cell features in stems and roots of black spruce and balsam fir

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Table IV

Results of analysis of covariance including principal component factors (PC1 and PC2), species (black spruce and balsam fir) and tree part (stem and roots).

	Earlywood			Latewood

	Lumen area	Cell diameter	Wall thickness	Lumen area	Cell diameter	Wall thickness
PC1	0.63	1.97	0.07	0.34	0.07	2.29
PC2	7.92^*	7.07^*	0.00	0.08	0.48	0.68
Species	231.96^****	159.41^****	4.86^*	12.15^**	2.33	15.69^**
Tree part	3.92	22.72^***	30.37^***	39.75^****	24.23^***	12.60^**

Asterisks indicate significant differences where

= p < 0.05,

^**

= p < 0.01,

^***

= p < 0.001

and

^****

= p < 0.0001.