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Selecting a Stocking Metric for Setting SPZ Retention Limits

This article discusses the challenges and solutions in selecting a stocking metric for setting retention limits in Class I streams, with a focus on Western Mensurationists. It presents a common framework using growth and yield models and shade and LWD models, leading to a rule recommendation.

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Selecting a Stocking Metric for Setting SPZ Retention Limits

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  1. Selecting a Stocking Metric for Setting SPZ Retention Limits Western Mensurationists Mark Teply Cramer Fish Sciences June 2013 mark.teply@fishsciences.net 360.456.4621

  2. Current Forest Practice Rules Leave 75 percent of the current shade over Class I streams.

  3. Concern: Too Little Retention 2008 IDEQ Forest Practices Audit Maggie Industrial

  4. Mission: Find Middle Ground

  5. Challenge: Multiple Tensions Property Rights Economics Silviculture Aquatic Habitat

  6. Challenge: Multiple Perceptions

  7. Solution: Common Framework Stand Data Growth and Yield Models (FVS) Shade and LWD Models

  8. Outcome: Rule Recommendation

  9. Outcome: Rule Recommendation

  10. Two Critical Components • Presentation Topics: • Selecting a metric • Use in implementation

  11. Why Consider Stocking Shumar and de Varona (2009)

  12. Selecting a Stocking Metric 1 – Stocking Table (e.g., as in current FPA rules) 2 – Summation form of Curtis’ RD

  13. Basal Area v. Relative Density Unharvested Stands Central Idaho Grand Fir-Western Redcedar

  14. Basal Area v. Relative Density Thin from Below Thin Uniformly Thin from Above CIGF0080CLWA1288 Central Idaho Grand Fir-Western Redcedar

  15. Challenge: Standardizing RD Relative Stocking = Stand RD / Maximum RD

  16. Implementation: “Tree Points”

  17. Implementation: Calculator

  18. Questions…

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