Forestry Terms - H -
HABITAT - (a) An area in which a specific plant or animal can naturally live, grow, and reproduce. (b) For wildlife, habitat is the combination of food, water, cover, and space.
HARDWOODS (DECIDUOUS TREES) - Trees with broad, flat leaves as opposed to coniferous or needled trees. Wood hardness varies among the hardwood species, and some are actually softer than some softwoods.
HEADRIG -Principal machine in a sawmill, used for the initial breakdown of logs by
sawing along the grain. Logs are first cut
into cants on the head rig before being sent on to other saws for further processing. Also known as head saw.
HEIGHT GROWTH: The increase in height over 5 years or the period between measurements (measured for coniferous trees).
HEIGHT TO CROWN, COMPACTED: The vertical distance in feet from the ground to the base of the compacted live crown.
HEIGHT TO CROWN, UNCOMPACTED: The vertical distance in feet from the ground to the base of the live crown, measured to the lowest live branch-whorl or lowest live branch excluding epicormics.
HIGH GRADE -Good quality timber.
-To cut the cream of the crop; take only the best trees out of the stand.
HIGH-GRADING - A harvesting technique that removes only the biggest and most valuable trees from a stand and provides high returns at the expense of future growth potential. Poor quality, shade-loving trees tend to dominate in these continually high-graded sites.
HIGH-LEAD LOGGING -Wire rope system that involves yarding in logs or trees by means of a rope passing through a block at the top of the head spar.
HOEDAG -Hoelike tool with an elongated blade used for planting trees.
HOG -Machine used to grind wood into chips for use as fuel or for other purposes; the wood used is usually waste wood unfit
for lumber or other uses.
-Coarse wood chips to be burned as a fuel.
HOGGED FUEL -Fuel made by grinding waste wood in a hog; a mix of wood residues such as sawdust, planer shavings, and
sometimes coarsely broken-down bark and solid wood chunks produced in the manufacture of wood products and normally
used as fuel.
HOG WOOD -Pulpwood logs to be chipped in a hog.
HOLDING WOOD -When felling timber, this is the part of a tree left uncut until the end in order to hold the fall of the tree in the desired direction.
HYDROLOGIC UNIT CODE: An inventory geographical locator for water uses and activities affecting watershed response and fisheries.