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Overview and Introduction for the Uninitiated

Overview and Introduction for the Uninitiated.

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Overview and Introduction for the Uninitiated

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  1. Overview and Introduction for the Uninitiated

  2. British Columbia’s forest inventory program began as a general examination of the province and a search for the highest quality and most easily accessible timber. Over the course of nearly eight decades, forest inventory methods have become much more sophisticated and are currently designed to answer many questions that were not even formulated until the 1990sJohn Parminter, Research Branch, B.C. Forest Service November 2000

  3. History of Forest Inventories in B.C. • The major challenges with the 1951-57 inventory were: • The vast areas to be inventoried. • The poor quality and small scale 1:40,000 or 40-chain military reconnaissance photography). • Poor access to potential areas of interest, particularly in the northern parts of the province.

  4. The Unit Surveys1961 – 1977 • the delineation of forest types and the estimation of attributes such as species composition, age class and height class • confirmation and validation of attribute estimates using ground sampling data . • sampling error of +10% (95% probability) and was based on stratified random sampling.

  5. Stand Estimate Criteria Age – by 9 age classes Height – by 8 classes Site index – by 4 classes (based on height at 100 years) Stocking - 4 classes

  6. Determination of Stand Attributes • Data collected from photo estimation supported by ground sampling • Modified random sampling with 2 plot clusters. • More systematic systems, more samples, closer to access.

  7. On-going Problemswith the Unit Survey Inventory • Sampling was restricted to mature stands only • Inventory design changed during this process • Invalid statistics being computed for sample data due to subjective plot selection. • Biases of magnitude and direction in volume estimates • Treatment of certain tree species as “Weed Species” such as lodgepole pine and deciduous species.

  8. Sub-Unit Surveys and Re-inventory 1978-1992 Sub-units were defined to include small areas from 5,000 to 10,000 hectares. Multi-phase sampling using 70mm low level photography (Phase 1), ground sampling (Phase 2), and detailed stem analysis (Phase 3). Environmental Protection Areas (EPA) introduced in 1973, became standard.

  9. The Basic Recommendations of the Peel Royal Commission • A total re-design of the Inventory and Management systems • A commitment to complete inventories of all renewable forest resource values using standardized compatible systems.

  10. Vegetation Resources Inventory Design Principles 1. The inventory covers the entire B.C. land base. 2. The inventory based on estimates of polygons. 3. Standardized inventory methods based on a standardized database 4. The inventory can be externally audited. 5. The inventory will accommodate recompilation for a variety of purposes.

  11. Vegetation Resources Inventory Methods • Photo Interpretation – The subjective delineation of polygons and estimation of attributes. • Ground Sampling – Plots randomly selected, and detailed measurement are made of resources at one or more locations in each selected polygon. • Statistical Adjustment – A statistical analysis of the data and the reporting function.

  12. VDYP The Variable Density Yield Prediction (VDYP) is an empirical yield prediction system for natural stands, based upon temporary inventory sample and permanent growth sample data. The model predicts stand heights, diameters, volumes and mean annual increments at different utilization levels and ages. VDYP uses the ‘Air Method’, which uses crown closure as the density measure

  13. Falling and bucking for Volume and Decay samples

  14. Name that Decade “There had arisen a fierce rush to stake timber. Hundreds and hundreds of men – experienced loggers, inexperienced youth – blossomed as ‘Timber cruisers’. The woods were furrowed with their trails. - - They had staked the good timber, and then the poor timber, and then the places that looked as if they had timber on them, and then places that lacked appearance.” Martin A. Grainger – 1905

  15. What do VRI attributes really mean

  16. FIP Attribute: NSR Definition: >200 < Regional Stocking Standards, orAs determined by Silv Survey

  17. Fip Attribute: NPBR Definition: “Stable” plant community of “Brush” species , no “potential” of conversion to treed

  18. FIP Attribute NP forest Definition: < 200 tree stems per ha.

  19. FIP Attribute: NCBR Definition: < 60% Crown Closure of “brush” species , non stable plant communuty, capable of conversion to treed

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