Lecture_Study_Guide_for_Exam_3

Lecture_Study_Guide_for_Exam_3 - Lecture Study Guide for...

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Lecture Study Guide for Exam 3 Rangelands Rangelands are grassland ecosystems used to graze domesticated livestock Rangeland degradation - causes Ruminants Cattle - massive use of grain and water resources Rangeland forage - forbs, sedges, rushes, and grasses Rangeland vegetation adaptations, roots, fire resistance Metabolic reserve Decreasers, increasers, invaders Grazing pressure - type of animals, number of animals, duration of grazing, and trampling Defoliators - overgrazing historically prevented by predation, disease, and movement across the grasslands Fire and drought are important natural disturbances Natural + human disturbances (hunting, development…) can degrade rangelands Carrying capacity - maximum sustainable density of grazers, varies with season, range condition, … Animal Unit Month - AUM Rangeland condition assessed with several metrics, % native plants, % production potential, … Historic rangeland community in the western U.S. Completion of the transcontinental railroad in 1869, huge changes in western grazing
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This document was uploaded on 10/27/2011 for the course RNR 1001 at LSU.

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Lecture_Study_Guide_for_Exam_3 - Lecture Study Guide for...

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