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Table 2 Summary of the linear mixed-effects models of below-crown hydraulic resistance (rbc) and the percent contribution of below-crown hydraulic resistance to whole-tree hydraulic resistance (%rbc) as a function of defoliation class and season

From: Below-ground hydraulic constraints during drought-induced decline in Scots pine

Parameter

Log(rbc)

sqrt(%rbc)

R2(m,c) = 0.28, 0.89

R2(m,c) = 0.51, 0.82

Intercept

− 1.62 ± 0.47***

4.84 ± 0.56**

Non-defoliated

− 0.41 ± 0.67 (ns)

ni

Spring

0.33 ± 0.09***

 

Summer

1.28 ± 0.09***

2.16 ± 0.54*

Non-defoliated: spring

− 0.04 ± 0.14 (ns)

 

Non-defoliated: summer

0.60 ± 0.14***

ni

  1. The coefficients indicate the difference between each level of a given variable and its reference level (‘defoliated’ for defoliation class and ‘winter’ for season, except for %rbc where the reference season was ‘spring’). The values are the coefficient estimates ± 1 SE. R2(m,c) refers to marginal and conditional R2 values, respectively
  2. ns no significant differences, ni not included in the model
  3. **0.001 < P < 0.01; ***P < 0.001
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Annals of Forest Science

ISSN: 1297-966X