Growth, chlorophyll and stress measurements for the Dublin maple trees with and without root crown excavationz.
Growthy/chlorophyll/stress measurement | Treatment | |
---|---|---|
Excavation Mean (SD) | No excavation Mean (SD) | |
2005 trunk diameter (cm) | 0.6 (0.3) | 0.8 (0.7) |
2006 trunk diameter (cm) | 0.7 (0.3) | 0.6 (0.4) |
2007 trunk diameter (cm) | 0.1 (0.2) | 0.1 (0.2) |
2005 tree height (cm) | 13.6 (20.8) | 19.7 (22.6) |
2006 tree height (cm) | 17.6 (23.3) | 15.2 (23.1) |
2007 tree height (cm) | 20.9(21.4) | 16.0 (18.5) |
2005 canopy width (cm) | 13.6 (15.5) | 19.7 (14.8) |
2006 canopy width (cm) | 25.5 (23.2) | 19.7 (20.3) |
2007 canopy width (cm) | 15.1 (33.2) | 12.7 (25.4) |
2004 twig extensionx (cm) | 4.9 (3.8) | 8.0 (6.3) |
2005 twig extensionw (cm) | 5.1 (3.5) | 7.0 (5.6) |
2006 twig extension (cm) | 10.8 (8.5) | 8.8 (11.3) |
2005 chlorophyll | 14.7 (5.4) | 13.6 (4.9) |
2006 chlorophyll | 20.2 (7.2) | 19.0 (4.7) |
2007 chlorophyllx | 9.3 (5.5) | 15.1 (11.1) |
2004 early fall colorv | 4.0 (0.7) | 4.0 (0.7) |
↵z Root crown excavation included girdling root removal for approximately 20% of the trees.
↵y Growth measurements except twig extension are increase in growth from the previous year.
↵x Analysis of variance significant at P < 0.01.
↵w Analysis of variance significant at P < 0.05.
↵v Scale of 1–5; 1 = red leaves, 5 = green leaves.
SD = Standard deviation.