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Abiotic
- Referring to the absence of living organisms.
Adaptation
-
The occurrence of genetic changes in a population or species as the result of natural selection so that it adjusts to new or altered environmental conditions.
Advance Growth
- see Advance Regeneration
Advance Regeneration
- Young trees under existing stands.
Regeneration established before logging that has survived the
logging operation.
Adventitious
- Of a plant part that develops outside the
usual order of time and/or position, e.g., an adventitious
bud arises from any part of a stem, leaf, or root but lacks
vascular connection with the pith; an adventitious root arises
from parts of the plant other than a pre-existing root, e.g.,
from a stem or leaf.
Aerial Seeding
- see Seeding
Afforestation
-
Establishing a forest on an area which has not previously had trees growing on it (see also reforestation).
Age
- Breast Height Age: The
number of annual growth rings between the bark and the pith, as
counted at breast height.
- Harvest Age: The number of years required to grow from
establishment to maturity.
- Stump Age: The number of annual growth rings between the
bark and the pith, as counted at stump height.
- Total Age: The number of years elapsed since the germination
of the seed or the budding of the sprout or root sucker.
- Total Forest Age: The average total age of the trees comprising
it.
Age Class
-
One of the intervals into which the age range of forest stands is divided for classification and use.
All-Aged Structure
- A stand in which trees of most or all
age classes, from seedlings to mature trees, are represented.
Allelopathy
- The influence of plants, other than micro-organisms,
upon each other, through the products of their metabolism.
Allowable Cut
- The volume of wood that may be harvested,
under management, for a given period.
Annual Ring
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A line appearing on tree cross-sections marking the end of a growing season and showing the volume of wood added during the year.
Area Ignition
- The setting of a number of individual fires
throughout an area, either simultaneously or in quick succession,
and so spaced that they soon coalesce, influence, and support
each other to produce a hot, fast spreading fire throughout the
area.
Artificial Regeneration
- Renewal of a tree crop by direct
seeding or by planting seedlings or cuttings.
Aspect
-
The compass direction towards which a slope faces.
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