Chapter 7: Rangeland Inventory and Monitoring1. Stocking rate adjustment 2. Maintenance of soil and...
Transcript of Chapter 7: Rangeland Inventory and Monitoring1. Stocking rate adjustment 2. Maintenance of soil and...
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Chapter 7: Rangeland Inventory and Monitoring1. What is rangeland inventory? 2. What is rangeland monitoring?3. What vegetational attributes are commonly used
in range management?4. What are the four primary types of grazing
surveys used in range management?5. How is rangeland condition determined?6. How is rangeland trend determined?7. What are decreasers, increasers and invaders?8. What are three commonly used approaches in
evaluating grazing intensity?
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Chapter 7
Rangeland inventory – a descriptive list of land, vegetation, infrastructure, and livestock resources for a particular pasture or ranch; provides accurate representation of existing conditions.Rangeland monitoring- a systematic
approach to evaluate responses to management actions over time.
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Characteristics commonly monitored on rangelands
1. Precipitation2. Forage production 3. Changes in rangeland ecological
condition4. Livestock productivitya. calf/lamb cropsb. calf/lamb weightsc. death loss
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Characteristics commonly monitored on rangelands cont.
5. Financial returnsa. dollars per acreb. dollars per cowc. production costs 6. Riparian health7. Soil/watershed health 8. Wildlife populations9. Grazing use10. Livestock numbers on pastures/ranch.
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Components of Sound Western Ranching
1. Grazing Managementa. Stocking b. Grazing systemc. Drought plan
2. Ranch Capitalizationa. Water b. Fencec. Corrals d. Roadse. Other
3. Livestock Managementa. Livestock selectionb. Breeding program c. Healthcared. Supplemental feedinge. Poisonous plants
4. Brush Managementa. Grazing b. Firec. Herbicided. Mechanical e. Biological
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Components of sound western ranching
5. Government Assistance
a. Drought reliefb. Technical assistancec. Vegetation
managementd. Conservation
6. Government regulations
a. Endangered species b. Clean airc. Clean waterd. Land usee. Penaltiesf. Incentives
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Components of Sound Western Ranching cont.
7. Product Demanda. Livestockb. Wildlifec. Recreationd. Plantse. Ecosystem services f. Other
8. Monitoring Programsa. Rain fall b. Forage productionc. Trend in ecological
conditiond. Livestock productivitye. Financial returnsf. Riparian healthg. Soil healthh. Wildlife populationsi. Grazing use
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Components of Sound Western Ranching cont.
9. Risk Management Programsa. Climateb. Biological c. Political d. Financiale. Other
10. Integration and Management.
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Primary components of a Ranch Inventory
1. Land area2. Pasture sizes3. Watering Points4. Fences 5. Corrals 6. Buildings7. Roads
8. Livestock9. Wildlife10. Farmland11. Waterways12. Equipment13. Dams14. Personnel15. Other
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Four Primary Vegetation Surveys Used by Range Managers
1. Grazing Intensity2. Grazing Capacity3. Range Condition4. Range Trend
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Methodology1. Grazing capacity• Weight estimate- key species approach• References: Cook and Stubbendieck (1986),
Holechek (1988), Holecheck and Pieper (1992).
2. Grazing Intensity (Forage Use)• % use• Stubble height measurement• % of grazed plants • References: Jasmer and Holechek (1984), Cook
and Stubbendieck (1986)
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Methodology cont.
3. Rangeland Ecological condition• Quantitative climax• Reference: Dyksterhuis (1949), Parker and
Harris (1958), Cook and Stubbendieck (1986), Holechek et al. (1995)
4. Rangeland Trend• Quantitative climax approach• Reference: Dyksterhuis (1949), Parker and
Harris (1958), Cook and Stubbendieck (1986), Holechek et al. (1995)
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Vegetational Attributes Used in Range Management
1. Weight or biomass- Weight of plants on a given area at a given time on a dry matter basis.
2. Cover- percent of the area covered by different plants on a given area at a given time.
3. Density – number of plant per unit area at a given time.
4. Frequency –percent of quadrats of a given size in which a plant species occurs at a given time.
*5. Plant height.
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Key species
Key species: Forage species whose use serves as an indicator to the degree of use of associated species:
1. abundant 2. productive3. palatable
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Key area
Key area: portion of the range; because of its:
1. location or2. grazing or browsing value or 3. use
can serve as an indicator of : 1. range condition2. seasonal use
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Grazing capacity and intensity
Grazing capacity - maximum animal numbers which can graze each year on a given area of range, for a specific number of days without inducing a downward trend in range condition. It is based on vegetation weight not cover.
Grazing intensity – Degree to which primary forage plants are grazed by livestock and wildlife.
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Methods of measuring grazing intensity
a. Stubble heights of key forage plantsb. Residues of forage plantsc. % of plants grazedd. % of herbage production of key forage
plant removed by livestock and wildlife (% use).
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Methodology Used in our Survey
3. Grazing Intensity-Stubble height/ocular appearance approach of Holechek and Galt 2000
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Uses of grazing intensity information
1. Stocking rate adjustment2. Maintenance of soil and watershed resources3. Maintenance of wildlife habitat4. Maintenance of livestock productivity5. Maintenance of forage productivity
*Proper grazing intensity is the most critical component of successful range management.
**Grazing intensity is the primary factor driving trend in range condition.
***Grazing intensity is the primary factor driving returns from livestock production.
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History of condition and trend
1. Dyksterhuis (1949) contribution2. Reflects plant response to grazing3. Validity of Clements and Dyksterhuis
theories4. Threshold concepts a. Is brush control needed?b. Should grazing be terminated?
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Range condition and trend terminology
Range site- an area unlike surrounding area because of potential to support a different kind of climax vegetation (same as habitat).
Range condition- State of health of the range usually judged on the basis of the climax vegetation that remains for a particular site.
Range trend- Rate and direction of change in range condition.
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Range condition and trend terminology
Decreaser- Decreases with grazing, very palatable.
Ice cream- Highly palatable and not abundant.Increaser I- Moderately palatable, secondary
forage. Increaser II - Present in the climax but low
palatability. Invader I - Species not present in the climax with
seasonal forage value. Invader II – Species not present in the climax with
no forage value.
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Climax Sagebrush Grassland Range
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Early Seral (Degraded) Sagebrush Grassland Range
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Succession
Primary succession
Pioneers
Seral stages
Climax
Weed stage
Secondary succession
Climax
76-100% (wt)
Climax plants
51-75% Good (Late seral)
26-50% Fair (Mid seral)
0-25% Poor (Early seral)
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Four assumptions
1. Climax is known2. Climax has highest value plants3. Climatic patterns are stable 4. Excellent range has better forage than
poor ranges
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Methodology Used in our Survey
2. Rangeland Ecological Condition-Dyksterhuis quantitative climax used by USDA-NRCS
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Calculation of range condition
• Southwestern Montana • 15-19 inch ppt. zone• silty site
Cover (Actual) • Idaho fescue 20• Rough fescue 10• Big sagebrush 5• Cheatgrass 5• Goatweed 10• 50%
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Calculation of range condition cont.
• Cover (Relative)
Calculation Procedures
• Idaho fescue 40= 20/50x100• Rough fescue 20= 10/50x 100• Big sagebrush 10= 5/50x 100• Cheatgrass 10=5/50x 100• Goatweed 20= 10/50x 100• 100%
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Calculation of range condition cont.
50%Condition is fair (Mid seral)
0200Goatweed (Inv)
0100Cheatgrass (Inv)
5105Big sage (Inc)
2020100Rough fescue (D)
254025Idaho fescue (Inc)
UsableCover on siteAllowed
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Practical Application of Condition and Trend
1. Grazing capacity adjustments2. Evaluation of management effectiveness
(Are you meeting your goals for a particular piece of rangeland?)
3. Separation of grazing from climatic effects4. Critical threshold problems.
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Problems with using range trend to monitor rangeland health.
1. Vegetation composition on heavily grazed, degraded rangelands may be stable because desirable plants have been eliminated.
2. Vegetation composition may be stable but desirable plants have low vigor.
3. Vegetation trend provided little information on how vegetation residues meet soil, watershed, livestock, wildlife, and esthetic needs throughout the year.
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Problems with using range trend to monitor rangeland health cont.
4. Fluctuation in annual and short lived perennial plants may cause large changes in vegetation composition not well related to health of the desirable forage plants.
5. By the time a downward trend is detected, long term damage to desirable perennial forage plants may have occurred.
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Conclusions on Rangeland Condition and Trend1. Clement’s - Dyksterhuis quantitative climax
model works for most situations.2. Four Elements are needed for grazing permit
adjustment3. Changes in condition and trend are the most
important elements in grazing permit adjustment
4. Public rangeland managers have difficulty in interpreting and reporting condition and trend data
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Conclusions on Rangeland Condition and Trend cont.
5. Range condition scores should depart 5% or more from intermediate and long term
6. Exclosures can play an important role in separating grazing from climatic influences.
7. Public rangeland managers need to learn how to better present condition and trend data to ranchers and public
8. Persuasion and education are better than coercion.
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