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Dead Wood in Forested Ecosystems: managing, modeling, monitoring and other mysteries

Dead Wood in Forested Ecosystems: managing, modeling, monitoring and other mysteries. Melissa Todd Weldwood Northern Operations. Goal.

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Dead Wood in Forested Ecosystems: managing, modeling, monitoring and other mysteries

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  1. Dead Wood in Forested Ecosystems:managing, modeling, monitoringand other mysteries Melissa Todd Weldwood Northern Operations

  2. Goal To develop ecologically-based forest harvesting retention objectives and strategies for structural elements related to the persistence of downed woody material (DWM) and its associated biodiversity in forested ecosystems.

  3. Guiding Principles • DWM functions at the scale of the stand, site or microsite and is a consequence of interactions between site productivity, topography/geography and successional processes • Landscape and stand level analyses and management objectives are both required to allow for coarse and fine scale variability • Dead wood conservation must incorporate spatial and aspatial management and apply to every hectare of ground – managed or unmanaged

  4. Guiding Principles • Management cannot replicate natural dead wood dynamics due to large scale biomass removal, but can attempt to emulate natural patterns and buffer anticipated troughs in supply • Management variables: • amount of existing DWM and new coarse woody debris (CWD) retained • Live and standing dead tree retention for downed wood recruitment through time (recruitment structure) • Rotation lengths to allow for recruitment of large piece size and advanced decay

  5. Study Area: Nadina Forest District (Morice and Lakes TSAs)

  6. GOAL Operational Strategies Downed Woody Material (DWM, existing deadfall) Coarse Woody Debris (CWD, logging slash) Recruitment Structure (snags, large live trees, immature trees) • Structural Retention Targets • Existing DWM / CWD • Recruitment Structure • Should Reflect: • Temporal pattern of persistence and recruitment through succession. Biological Effectiveness Monitoring Invertebrate Community Response

  7. Managed vs Unmanaged (mature/old) volume, diameter, length, elevation, decay class Operational Strategies Operational Practices DWM CWD Wildlife Trees CWD Target Matrix Objectives and Monitoring “bookends”

  8. Operational Best Practices and Contractor Training

  9. Downed Wood Target Matrix ESSFmc

  10. GOAL Operational Strategies Downed Woody Material (DWM, existing deadfall) Coarse Woody Debris (CWD, logging slash) Recruitment Structure (snags, large live trees, immature trees) • Structural Retention Targets • Existing DWM / CWD • Recruitment Structure • Should Reflect: • Temporal pattern of persistence and recruitment through succession. Biological Effectiveness Monitoring Invertebrate Community Response

  11. Dead Wood Dynamics“supply modelling” • Persistence and recruitment through successional stages • Varying stand initiation conditions / levels of structural elements (DWM, snags, LLT, SLT)

  12. The Process: What we know: “The Bookends” Parameterization of structural elements by successional stage Rates of persistence and recruitment Structural Retention Target Ranges Structural element modelling

  13. What we know:1. Downed Wood, Residual Trees Early vs Old 2. Large Live Trees and Snags Mature/Old 3. Limited information for mid- successional stages Sources: Lloyd 2001, 2002 Cruise data Permanent Sample Plots Forest cover inventory type group

  14. Parameterization of structural elementsEstablish chronosequence:1. Site series/ecosystem unit x successional stage with emphasis on mid-successional data2. Disturbance type: fire, blowdown, beetles, management

  15. Rates of persistence and recruitment:Tree mortality rates Fall down rates Decay ratesBy stand conditions :e.g. disturbance type tree species stem density site productivity

  16. Structural element supply modelling:Stand dynamics modelsStructural element growth and yield curvesMulti-scale forecast modellingSensitivity analyses (varying initial stand conditions)

  17. Organizational and Geographic Scale: • Landscape Supply • Growth and yield curves • Inventory resolution • Pattern oriented • SELES, McGregor Model, TELSA Linkage • Temporal Stand Dynamics • Site conditions • Rates of change • Process oriented • TASS, SORTIE, Prognosis

  18. Partners and Acknowledgements: • Ruth Lloyd, Consultant • Houston Forest Products / Babine Forest Products • CanFor Houston • Carl Vandermark, Jim McCormack • Fraser Lake Sawmills • Jennifer Lecuyer • Morice Lakes TSAs IFPA • Tesera • MOF Forest Practices Branch • Nancy Densmore • FERIC • Eric Phillips • UNBC • Staffan Lindgren, Rob Higgins

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