BMP - Tree Risk Assessment - 71

Tree and site conditions that can indicate the potential for root-related structural problems:
* Crown dieback, thinning, or decline. Root decay can restrict the
movement of water and nutrients into the crown, which can lead to
crown dieback, thinning, or decline. This may take years to become
apparent after root damage.
* Evidence of trenching, grade changes, compaction, or other root
or soil disturbance may be seen as depressed lines on the soil surface,
sharp drop-offs, or other changes in levels; areas that lack vegetation;
or mounds of soil. New pavement or foundation near a tree can also
indicate that roots have been damaged.
* Soil mounding or cracking is associated with a leaning trunk and
may indicate that the roots are lifting the soil. Dry soil may also have
cracks that are unrelated to tree movement.
* Restricted soil space. If rooting area is restricted by structures,
soil compaction, impermeable soil layers, excessive soil water, or
a high water table, the root system may not develop well enough to
adequately anchor the tree.
* Excessive soil moisture. If the soil is frequently saturated due to
flooding, high water table, or other conditions, soil cohesion and shear
strength may be reduced, resulting in a loss of the anchoring ability
of the roots. A change in soil hydrology from site preparation work
can also affect soil moisture levels.
* Soil erosion. Loss of soil due to wind or water flow can reduce root
contact with the soil and compromise the effect of reaction wood
development.

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BMP - Tree Risk Assessment

Table of Contents for the Digital Edition of BMP - Tree Risk Assessment

Table of Contents
BMP - Tree Risk Assessment - Cover1
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BMP - Tree Risk Assessment - Table of Contents
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