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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 Western Mensurationists Mark Teply Cramer Fish Sciences June 2013 mark.teply@fishsciences.net 360.456.4621
Current Forest Practice Rules Leave 75 percent of the current shade over Class I streams.
Concern: Too Little Retention 2008 IDEQ Forest Practices Audit Maggie Industrial
Challenge: Multiple Tensions Property Rights Economics Silviculture Aquatic Habitat
Solution: Common Framework Stand Data Growth and Yield Models (FVS) Shade and LWD Models
Two Critical Components • Presentation Topics: • Selecting a metric • Use in implementation
Why Consider Stocking Shumar and de Varona (2009)
Selecting a Stocking Metric 1 – Stocking Table (e.g., as in current FPA rules) 2 – Summation form of Curtis’ RD
Basal Area v. Relative Density Unharvested Stands Central Idaho Grand Fir-Western Redcedar
Basal Area v. Relative Density Thin from Below Thin Uniformly Thin from Above CIGF0080CLWA1288 Central Idaho Grand Fir-Western Redcedar
Challenge: Standardizing RD Relative Stocking = Stand RD / Maximum RD
