Article Figures & Data
Figures
- Figure 1.
Aerial view of the 3 measurements utilized to predict root regrowth in our study include: Treatment, which denotes 1 of the 3 levels of trenching damage inflicted on the trees 5 years prior to the study, with the treatments being trenching at distances of 3, 6, and 12 times the DBH from the tree’s base; Cut Root CSA, representing the cross-sectional area of the root cut during trenching, derived from the average of 2 perpendicular diameter measurements; and Distance, indicating the Euclidean distance from the cut root to the nearest point on the base of the tree. Given the relationship between distance and treatment, these factors were analyzed separately in conjunction with cut root CSA to determine which offered greater predictive power.
- Figure 2.
Average cross-sectional area of roots that regrew 5 years post-trenching (yes, n = 519) compared to those that did not (no, n = 38). Error bars represent standard error.
- Figure 3.
Average distance from the cut root to the base of the tree (cm) of roots that regrew 5 years post-trenching (yes, n = 519) compared to those that did not (no, n = 38). Error bars represent standard error.
- Figure 4.
Histogram depicting the number roots emerging from each cut root assessed in this study. A total of 557 cut roots were remeasured for this study with each root producing an average of 3.1 new roots.
- Figure 5.
Average root CSA regrowth percentage by treatment. Regrowth was determined by dividing the combined cross-sectional area of all new roots by the cross-sectional area of the originating cut root and then multiplying the result by 100. ‘Treatments’ denote trenching activities where roots were cut at distances of 3, 6, and 12 times the diameter of the respective tree. Error bars represent standard error.
- Figure 6.
Relationship between the cross-sectional area of the root cut during trenching and the percentage of root regrowth observed 5 years later. Regrowth was calculated by dividing the combined cross-sectional area of all new roots by the cross-sectional area of the original cut root, then multiplying the result by 100. A linear trend line is included for reference; however, the relationship was not significant (P-value = 0.066) when factored into models with other predictors.
- Figure 7.
Relationship between the distance between the trunk and the cut root end and the percentage of root regrowth observed 5 years later. Regrowth was calculated by dividing the combined cross-sectional area of all new roots by the cross-sectional area of the original cut root, then multiplying the result by 100. A linear trend line is included for reference. The relationship was significant (P-value = 0.002) when modeled with cut root cross sectional area (P-value = 0.125). R2 for the above fitted line is 0.03.
Tables
- Table 1.
Percentage of tree roots that either regrew after cutting or did not regrow separated by initial trenching treatments.
Trenching treatment Root regrowth 3× DBH 6× DBH 12× DBH Yes 239 (92.3%) 223 (93.7%) 57 (95%) No 20 (7.7%) 15 (6.3%) 3 (5.0%)
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