Variation in spring and autumn freezing resistance among and within Spanish wild populations of Castanea sativa

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Table VI

Pearson’s correlation coefficients between the field and damage traits and the geoclimatic parameters at origin.

Geoclimatic parameters^c	Field traits^a				Damage traits^b

	BB06		LF06		SD1		TB1		DBP1		SD2		TB2		DBP2
All populations (N = 6)
A	0.91	^*			0.91	^*	0.90	^*	0.91	^*
PE							–0.82	^*	–0.86	^*
TMMC	0.84	^*			0.90	^*	0.87	^*	0.90	^*
AMT			0.92	^*									0.96	^**	0.81	^*

Four northern populations (N = 4)
TMMF													–0.99	^**	–0.96	^*
ND0S	1.00	^***	0.95	^*	0.98	^*	0.98	^*	0.96	^*	0.99	^**
ND0A	0.98	^*			0.97	^*					0.99	^**

BB06, Bud burst in spring 2006; LF06, Leaf fall in autumn 2006.

SD1 and SD2: Spring and autumn stem damage, respectively; TB1 and TB2: Spring and autumn damage on terminal bud, respectively; DBP1 and DBP2: Spring and autumn damage on lateral buds (in percentage), respectively.

A: drought index; PE: min. monthly summer precipitation; TMMC: mean of max. temp. in month with highest mean; AMT: absolute maximum temp.; TMMF: mean of min. temp. in month with lowest mean; ND0S and ND0A: no. days with T < 0 °C in spring and in autumn, respectively. Significance levels.

^***

P < 0.001;

^**

P < 0.01;

P < 0.05.