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Table 3 Analysis of covariance tables for comparison between species including DBH as a covariate for mean slenderness, diameter, length, and cumulative diameter of secondary branches on three individuals of seven angiosperm species (listed in the text)

From: Factors affecting branch failures in open-grown trees during a snowstorm in Massachusetts, USA

  

Slenderness

Diameter

Cumulative diameter

Length

Source

DF

MS

F

p

MS

F

p

MS

F

p

MS

F

p

Species

6

44

1.23

0.394

5.90E-05

0.64

0.698

0.002

1.47

0.312

0.117

1.43

0.323

DBH

1

361

10.2

0.015

1.00E-02

113

<0.001

0.142

125

<0.001

14.8

181

<0.001

DBH*Species

6

71

2

0.193

1.60E-04

1.75

0.24

0.004

3.12

0.081

0.32

3.91

0.049

Best-fit line

 

67 – 17 × DBH

0.02 + 0.19 × DBH

0.01 + 0.59 × DBH

2.39 + 12.2 × DBHy

           

2.39 + 5.01 × DBHx

r 2

 

0.86

  

0.97

  

0.97

  

0.99

  
  1. ‘*’ Indicates an interaction between main effects.
  2. Excepting branch length, one best-fit line described the relationship between DBH and each response variable for all species.
  3. yGreen ash, London planetree, red oak, Liberty elm.
  4. xRed maple, honeylocust, littleleaf linden.