Forestry Terms - N,O -
NATURAL STAND (NATURAL REGENERATION) - A stand of trees grown from natural seed fall or sprouting.
NET ANNUAL GROWTH -Increase in volume of trees during a specified year. Components of
net annual growth include the
increment of net volume of trees at the beginning of the specified year that survive to
the year s end, plus the net volume of trees
reaching the minimum size class during the year, minus the volume of trees that died
during the year, and minus the net volume of
trees that become rough or rotten trees during the year.
NONCOMMERCIAL SPECIES -Tree species in which small size, poor form, or inferior quality
is typical. These species do not normally develop into trees suitable for conventional
forest products.
NUTRIENTS - Elements necessary for growth and reproduction. Primary plant nutrients are nitrogen, phosphorus, and potassium.
ODOR TYPE AND CONCENTRATION: The threshold ambient concentration at which certain pollutants are odoriferous to humans.
OLD GROWTH: See STAND CONDITION.
ONGROWTH: See TREE HISTORY.
ON THE STUMP - Standing, uncut timber.
OPEN GROWN OR ISOLATED TREES: Trees or shrubs with crowns receiving full light from above and from all sides.
OVERMATURE -Point at which timber has begun to lessen in commercial value because of
size, age, decay, or other factors.
Many trees in a virgin or old growth stand are overmature and are, in fact, dying of old
age.
OVERRUN -Difference between the log scale of a shipment of timber and the volume of actual
lumber obtained from it.
OVERSTORY -Layer of foliage in a forest canopy including the trees in a timber stand. Tall
mature trees that rise above the shorter immature understory trees.
OVERSTORY REMOVAL -Any silvicultural treatment with the desired end result being the
removal of the overstory component from the growing stock of a multistoried stand.
Examples are outright harvest, girdling, and simply felling the overstory.
OVERTOPPED TREES: Understory trees or shrubs generally of tolerant species
such as Engelmann spruce. If they can be released through some kind of treatment, and have
not been too badly deformed, such trees will make suitable crop trees. Overtopped trees
are often of a younger age than the main canopy.
OWNERSHIP: The identification of the legal owner/administrator (Federal, State, Local, Private) on both the surface and subsurface estates.
