Root systems are not perfect circles, they adapt to hardscapes such as structures on deep footings or engineered roads. Simply put, to estimate root system loss, you must know where the roots are.
On most site plans, root systems are shown as perfect circles. This method is unscientific and misleading. The example shows a root zone drawn as a perfect circle, where roots are shown to extend under buildings and hardscapes.
The result is that root system loss is depicted as just 15%. At this low level of root loss, a tree might survive.
When boundaries to root growth are correctly outlined, the Tree Matrix Root Plotter depicts a more accurate root growth pattern. Because of the influence of hardscapes in this example, the Root Plotter predicts the same disruption would damage 38% of the root zone.
Tree Matrix Root Plotter predicts a 38% root loss, which can be highly impactful to most trees.
Our algorithm is derived from over 35 years of tree preservation experience, peer reviews and the most modern research into our 5 factor algorithm. It is validated by world reknowned experts.
The Tree Matrix algorithm has been vetted by leading researchers and experts in the field of arboriculture. While more research is needed in areas such as root growth patterns and the accumulated impact of root loss, the formula represents the most contemporary understanding of construction impacts on trees. The result is a highly accurate assessment of how construction will impact an existing tree.
The root plotter depicts the most accurate root growth patterns based on physical barriers to root expansion. In order to accomplish this the user must identify these barriers.
Our unique root plotter tool works to depict where tree roots are likely to exist. This is based on the anticipated Critical Root Zone (CRZ) of a tree with a particular diameter size at breast height. The area of this CRZ is calculated and expressed in square footage. When the user adds physical barriers to root growth, the root plotter automatically depicts the anticipated root system. This depiction is based on widely held understanding of rooting patterns. The user must also consider other factors that could deflect or attract roots, such as compacted soils that can inhibit root growth, or wetter soils that will attract root growth. The edit feature will allow the user to adjust the CRZ dimensions accordingly.
The Tree Matrix algorithm uses five parameters that affect the long-term survivability of trees following construction. The formula produces a score as a percent likelihood of survival. The range is from 0-100%. Here are the likely results given a particular survival score:
The Tree Matrix algorithm uses five parameters that affect the long-term survivability of trees following construction. The formula produces a score as a percent likelihood of survival. The range is from 0-100%. Here are the likely results given a particular survival score:
0-59% Survival scores in this range suggest that the tree will not survive the typical 3-5-year recovery period after impact. In this range, it is best to remove the tree.
60-64% Survival scores within this range have a low to moderate chance of survival. Pre- and post-construction treatments are essential to best insure survival.
65-69% Survival scores within this range suggest that survival is possible with pre- and post-construction treatments. Supplemental irrigation and insect and disease control will be required.
70-80% Scores in this range suggest that survival is likely, but that pre- and post-construction treatments will be necessary. Supplemental irrigation and insect and disease control is highly recommended.
81-90%, Scores in this range are good, and suggest that survival is likely. Irrigation may be applied based on the amount of natural rainfall, and the general water needs of the specific tree impacted. A permanent irrigation system would not be required. Insect and disease monitoring and control are beneficial.
91-100%, Scores in this range are excellent. It suggests that the tree should not display any signs of stress, or a loss of vigor. A permanent irrigation system would not be required. Insect and disease monitoring and control are beneficial, but not necessary.
Four of the five factors can be altered to increase survivability likelihood. Root zone loss can be reduced, tree condition can be improved, the season of impact altered and the number of 'sides' impacted around the tree can be adjusted.
Users can alter 4 of the 5 parameters used in our formula in order to increase the likelihood of tree survival. The percentage of roots lost can be decreased, season of impact can be directed to the dormant season, the tree’s condition can be improved prior to root pruning, and, finally, the number of sides impacted can be kept to a minimum. All options should be considered in the user’s attempt to reach a survival score of at least 70%. Trees with survival scores below 70% may survive, but it will require a higher degree of pre- and post-construction treatments.
