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Soil Conservation Monitoring:

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How are allowable levels of soil disturbance set ... Silviculture Prescriptions ... Limit of survey is above allowable levels set in Silviculture Prescription ... – PowerPoint PPT presentation

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Title: Soil Conservation Monitoring:


1
Soil Conservation Monitoring
  • Forest Practices Code of
  • British Columbia

2
  • How are allowable levels of soil disturbance set
    for a cutblock?
  • How is compliance assessed?

3
Definitions
  • Permanent vs. temporary access structures (e.g.
    roads, landings)
  • Permanent access up to 7 of block
  • Temporary access can exceed soil disturbance
    limits by 5, but must be rehabilitated

4
Definitions
  • Soil disturbance features
  • unrehabilitated temporary trails
  • corduroyed trails
  • compacted areas
  • dispersed disturbances
  • ? can occupy up to 10 of block area, depending
    on site sensitivity

5
Silviculture Prescriptions
  • SP is lowest-level plan ? submitted for each
    cutblock by forest licensee on Crown land
  • Must specify
  • site sensitivity
  • seasonal or site constraints to forest practices

6
Hazard Assessment Key Guidebook
  • Uses site and soil information to rate site
    sensitivity (L, M, H, or VH) for 3 major hazards
  • compaction and puddling
  • soil displacement
  • soil erosion

7
Compaction and Puddling Hazard
  • Based on
  • texture
  • coarse fragments
  • moisture regime
  • presence of thick forest floors or organic soils

8
Soil Displacement Hazard
  • Based on
  • slope gradient and complexity
  • depth to root-restricting layers or adverse
    chemical properties (e.g. carbonates)

9
Soil Erosion Hazard(for exposed mineral soil,
not roads ditches)
  • Uses similar factors to USLE
  • precipitation/snowmelt regime
  • slope gradient, length, uniformity
  • soil texture, structure, coarse fragments,
    impervious layers

10
Most limiting hazard determines
  • allowable level of soil disturbance (higher
    hazard ratings ? less allowable disturbance)
  • which soil disturbance features are included
    during assessment of compliance (i.e. certain
    features are only counted on more sensitive sites)

11
Seasonal Constraints
  • Based on local experience and/or research
  • example on sites with H or VH compaction
    hazard, SP could restrict harvesting to dry or
    frozen ground, or adequate compressible snowpack

12
Assessing Disturbance
  • 1. Visual inspection is anything obviously
    wrong?
  • locations dimensions of roads, landings
  • completion of TAS rehabilitation
  • areas of concentrated disturbance

13
Assessing Disturbance
  • 2. Formal compliance survey (seldom needed)
  • roads landings traverse survey with hip-chain
    (length width)
  • soil disturbance can be assessed for selected
    areas gt 1 hectare uses transect surveys which
    tally occurrence of features

14
Transects for small strata (lt 10 ha)
  • parallel closely-spaced transects giving at least
    500 regularly-spaced observation points per
    survey stratum

15
Transects for larger strata (gt 10 ha)
  • pairs of randomly oriented 30-m transects (at
    90) from origin points arrayed in a regular grid
  • disturbance features recorded at 1-m intervals on
    transects

16
Does survey indicate compliance or non-compliance?
  • For both traverse and transect surveys, calculate
    confidence limits
  • Decision rules based on LCL non-compliance if
    Lower Confidence Limit of survey is above
    allowable levels set in Silviculture Prescription
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