Spacing control -Act of creating, within the limits of the existing stand, a uniform distribution of trees that provides optimum growing space for each tree by eliminating overcrowding. As a result, tree diameter growth is increased and the time required for the forest to reach harvestable size is decreased. Spar tree -Tree or mast on which rigging is hung for one of the many cable hauling systems. Species -Group of similar individuals having a number of correlated characteristics and sharing a common gene pool. The species is the basic unit of taxonomy on which the binomial system has been established.
Species is both the singular and plural form of the word.
The number of species present in a community or a defined area. Specific gravity -Ratio of the weight of a volume of material to the weight of an equal volume of water at a given temperature. Spring Seep - A class of wetland created by groundwater emerging on lower slopes in small pools surrounded by vegetation. Spur road -Road that supports a low level of traffic, such as a level that would serve one or two settings. Little or no engineering design work is needed to build it.