habitat.  The environment in which the plant or animal lives. Syn. site
          hand planting A reforestation method of planting seedlings by hand, usually with spacing to minimize competition and maximize growth. Seedlings are often 2 years old, giving the new forest a head start over seeding methods.
          hardwood.   1. Generally, one of the botanical group of trees that have broad leaves, in contrast to the needle-bearing conifers. 2. Wood produced by broad-leaved trees, regardless of texture or density.
          harvest.  Extraction of some type of product from the forest. Generally associated with a cutting.
          haulback line.  In cable logging, the line used to pull chokers or the carriage from the landing out to the felling area.
          heart rot.  A decay characteristically confined to the heartwood. It usually originates in the living tree.
          heartwood.  The inner core of a woody stem, wholly composed of nonliving cells and usually differentiated from the outer enveloping layer (sapwood) by its darker color.
          heel-in.   To store young trees before planting by placing them in a trench and covering the roots with soil.
          herbicidesA broad class of chemicals used to kill weeds, grass, brush, or competing trees.
          high grading.  The removal from the stand of only the best trees, often resulting in a poor-quality residual stand.
          high-lead logging.  Logging system that uses cables rigged to a spar high above the ground so that one end of the logs can be lifted during yarding.
          hinge wood.  In felling, the portion of the tree that remains uncut. The width and location of this wood helps determine which way the tree will fall.
          hog.  A machine used to reduce waste pieces of lumber and slabs, or small tree stems, to chip form.
          hot deck.  A log pile where both yarding and haul-truck loading take place in rapid succession.
          humus.  The plant and animal residues of the soil (litter excluded) that have decomposed to the point where their origin is no longer recognizable.
          hybrid.  A cross between two species that results in a sterile (but often more desirable) offspring.
          hypsometer.  . An instrument used to measure the heights of trees, employing geometric or trigonometric principles.

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