SRM Glossary

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Term Description Source
Open Herding

Allowing a herd to spread naturally while grazing. cf. free ranging

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Open Range

(1) Range which has not been fenced into management units. (2) All suitable rangeland of an area upon which grazing is permitted. (3) Untimbered rangeland. (4) Range on which the livestock owner has unlimited access without benefit of land ownership or leasing.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Opening Date

(1) The date on which an established grazing season begins. (2) The date on which a legally established hunting or fishing season begins.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Operating Unit

Syn. Ranch

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Opportunistic Species

A species adapted for utilizing variable, unpredictable or transient environments; tends to be characteristic of ephemeral plants.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Opportunity Cost

The financial returns given up by not putting a factor of production, particularly capital, to a different use.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Organism

Any living entity; plant, animal, fungus, etc.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Orphan

An offspring whose mother has died.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Outcrop

The exposure of bedrock or strata projecting through the overlying cover of detritus and soil.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Oven-Dry Weight

The weight of a substance after it has been dried in an oven at a specific temperature to equilibrium.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overgrazed Range

A range which has experienced loss of plant cover and accelerated erosion as a result of heavy grazing or browsing pressure.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overgrazing

Continued heavy grazing which exceeds the recovery capacity of the community and creates a deteriorated range. cf. overuse

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overland Flow

Surface runoff of water following a precipitation event. cf. runoff

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overstocking

Placing a number of animals on a given area that will result in overuse if continued to the end of the planned grazing period.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overstory

The upper canopy or canopies of plants. Usually refers to trees, tall shrubs and vines.

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.
Overuse

Utilizing an excessive amount of the current year's growth which, if continued, will result in range deterioration. cf. overgrazing

Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.