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Table 4 Correlations (Pearson coefficients) between seasonal circulation atmospheric patterns (NAO, North Atlantic Oscillation; WeMO, Western Mediterranean Oscillation) and tree-ring width indices of the first two principal components of all tree-ring width chronologies (PC1, PC2) and P. nigra local chronologies for the period 1901–2009

From: Growth response to climate and drought change along an aridity gradient in the southernmost Pinus nigra relict forests

  

Principal components

Sites

Patterns

Season (year) (months)

PC1

PC2

TL

AL

FI

MA

MG

NAO

Autumn (t-1) (SON)

−0.23

−0.01

−0.22

−0.08

−0.08

−0.12

−0.15

 

Winter (t-1) (DJF)

0.04

0.13

0.11

0.09

0.06

−0.03

−0.04

 

Spring (t) (MAM)

0.13

−0.10

0.11

0.02

0.15

0.09

0.13

 

Winter-spring (t) (FMA)

0.21

−0.02

0.20

0.11

0.14

0.15

0.18

WeMO

Autumn (t-1) (SON)

0.01

0.01

0.04

−0.04

−0.21

0.07

−0.10

 

Winter (t-1) (DJF)

0.08

0.12

0.14

0.13

0.03

0.13

0.07

 

Spring (t) (MAM)

0.11

0.02

0.09

0.09

0.05

0.14

0.07

 

Winter-spring (t) (FMA)

0.12

0.01

0.12

0.08

0.08

0.10

0.08

  1. The growth is related with circulation atmospheric patterns for the year of tree-ring formation (t) and the previous one (t − 1). Bold values are significant (P < 0.05). Sites’ codes are as in Table 1
  2. Seasons: SON September–October–November, DJF December–January–February, MAM March–April–May, FMA February–March–April
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Annals of Forest Science

ISSN: 1297-966X