Precommercial operations improve species composition and increase the quality, growth, and vigor of remaining trees. Precommercial Treatments forestry operations that require landowner investment, such as cleaning or weeding stands to remove trees that have little or no cash value. See commercial treatments. Precut Lumber PET to desired length in the sawmill. Predator An animal that preys on and devours other animals.
Spotted owls prey on rodents, and mountain lions prey on deer.
The use of fire under specific environmental conditions to achieve forest management objectives. Used to reduce hazardous fuel levels, control unwanted vegetation, favor desired vegetation, and improve visibility and wildlife habitat. A comparison of revenues and costs now and in the future. Present Net Worth is used to evaluate investment. Also known as Net Present Value, Net Present Worth, and others.