Unformatted text preview: c. Increases loss of soil particles d. Has no real effect on rangeland soils in most cases e. Has increased the amount of moisture in the soil 5. During what period in their annual cycle are perennial grass plants most vulnerable to heavy defoliation? Plants are considered to be most vulnerable to grazing damage when carbohydrates in the roots are not sufficient enough to initiate regrowth. With intense defoliation, the entire root system becomes smaller, shallower, and less branched. This affects the plant’s ability to absorb water and nutrients from the soil. Eventually, with continued heavy grazing, the plant’s health declines to the point where death may occur. 6. What successional (seral) stage will best meet the nutritional needs of livestock and habitat needs of wildlife on most rangelands (particularly grasslands)? a. early seral b. mid seral c. late seral d. climax...
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- Fall '11
- Photosynthesis, heavy grazing