BMP - Tree Inventories - 24

standard. Such standards are designed to
provide universal terms to ensure clarity and
consistency in arboriculture.
The basic maintenance treatments
(activities) may be listed as follows:
*	 Remove or Take Down. This is
the removal of a tree with a final
cut at the base of the tree. It may
also include stump removal. The
reasons for removal range widely
from mandatory removal of high-risk
trees to optional removal as the best
long-term management strategy for
lower-risk trees.
*	 Transplant. Remove a small tree
that was not planted in the correct
location by transplanting to another
site, rather than cutting at the base.

Figure 11. National pruning
standard-American National
Standard for Tree Care Operations-Pruning (A300, Part 1-2008)

*	 Clean. Cleaning is the removal of
dead, diseased, or broken branches. It is important to specify a minimum
size, such as 2 in (5 cm), for such a maintenance determination.
*	 Raise. Trees with this maintenance value require pruning to remove
low branches that interfere with pedestrian or vehicular traffic, lines
of sight, lawn maintenance, or come into contact with structures. The
urban forest manager should provide the clearances required by local
code; lacking this information, 8 ft (2.4 m) over sidewalks and 14 ft
(4.3 m) over roads may be substituted. For grounds maintenance,
a minimum clearance for riding mowers can be specified, typically
7 ft (2.1 m).
*	 Structural prune. This is selective pruning to improve tree and
branch architecture. It is typically done on young trees to provide
for future strong structural development and improve health with
better air circulation.
*	 Thin. This is the selective removal of live branches to reduce branch
density. Thinning is done to reduce tree density, increase wind and
light penetration, eliminate crossing branches, and clear excessive
sprout development.
24
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