A probability distribution is selected for analysis purposes based on experience, intuitive feelings, knowledge, and the lack of knowledge. Unconstrained Maximum Level of management defined as the highest possible level of a given output along with the costs associated with achieving it. In logging, the notch cut in a tree to govern the direction in which the tree is to fall and to prevent splittng. In forest management, the harvesting of a quantity of timber less than the budgeted cut. Under Plant To set out young trees or sow seed under an existing stand.
Underprivileged Groups See Disadvantaged Groups .
Understocking indicates a waste of resources, for certain purposes since the site is not fully occupied. Undesirable Species Plant species that are not desirable because they are unpalatable or low in palatability, injurious to animals, poisonous, poor stabilizers of soil and water, etc. Specifying the number of proportion of trees of particular sizes to retain within each area, thereby maintaining a planned distribution of size classes usually regulates cutting. A forest stand composed of trees that differ markedly in age and sizes growing together on a uniform site. A resource not duplicated anywhere.