Dimension measurement data from four roots growing under concrete sidewalk between two foam protection layers. Offset measurements relative to root pith were measured as radius to edge in horizontal (defined by foam panel interface) and vertical (perpendicular to defined horizontal plane) directions. Left and right horizontal were defined by view from proximal end of the root section toward the distal end of the collected root sample.
| TREE label | A | B | ||
|---|---|---|---|---|
| ROOT label | 1 | 2 | 1 | 2 |
| Section (5 cm) count | 35 | 23 | 19 | 28 |
| Mean (S.E.) root vertical diameter (mm) | 31 (1.1) | 35 (1.4) | 31 (0.7) | 52 (0.6) |
| Mean up (+) versus down (−) vertical growth offset as % (S.E.) | −27 (3.7) | −22 (4.6) | −27 (3.3) | −31 (2.7) |
| Mean (S.E.) root horizontal diameter (mm) | 35 (1.4) | 45 (2.9) | 25 (0.7) | 60 (1.7) |
| Mean left (+) versus right (−) horizontal growth offset as % (S.E.) | 8 (5.2) | −13 (6.0) | 2 (4.2) | 2 (3.3) |
| Mean (S.E.) vertical-horizontal dia. growth differential (mm) | −3.3 (1.5) | −10.1 (3.0) | 5.5 (1.0) | −8.1 (2.0) |