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OLD GROWTH RETENTION. Planning for Old Growth Retention. Goals Spatially locate and map OGMAs based on maximizing biological effectiveness within the constraints Legally establish objectives for OGMAs. Acronyms. CFLB = Crown forested land base THLB = timber harvesting land base

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Planning for old growth retention
Planning for Old Growth Retention

  • Goals

    • Spatially locate and map OGMAs based on

      • maximizing biological effectiveness within the constraints

    • Legally establish objectives for OGMAs


  • CFLB = Crown forested land base

  • THLB = timber harvesting land base

  • NC = non-contributing land base

  • OGMA = old growth management area

  • BEC variant = biogeoclimatic variant

  • TSR = timber supply review

  • SDM = statutory decision maker

  • WTR = wildlife tree retention

Planning for old growth retention1
Planning for Old Growth Retention

Data Preparation

Develop OGMA Targets

Develop WTR


Delineate OGMAs

Write LU Objectives

Legally establish LU Objectives

Data preparation
Data Preparation

  • Classify the landscape unit data set to:

    • prepare old growth retention report (table 2.8)

    • produce colour themed maps

Data preparation old growth retention report table 2 8
Data Preparation - old growth retention report (table 2.8)

  • provides an overview of all LUs in a planning area by BEC variant

    • % old growth in NC to meet old growth target

    • % old in THLB available to meet targets, if required

    • % almost old in NC and THLB to meet targets, if required

    • % old an almost old in the constrained THLB

    • % of THLB that meets minimum harvest age

  • allows for monitoring

Planning for old growth retention2
Planning for Old Growth Retention

Data Preparation

Develop OGMA Targets

Develop WTR


Delineate and Assess


Write LU Objectives

Legally Establish LU Objectives

Planning for old growth retention3
Planning for Old Growth Retention


  • Step 1: Prepare OGMA targets report (accounting)

  • Step 2: delineate draft OGMAs (design)

  • Step 3: assess draft OGMAs

Planning for old growth retention step 1 ogma targets report
Planning for Old Growth Retention -Step 1: OGMA targets Report

  • Biodiversity emphasisOld growth targetExisting OG in NC Based on Table 2.8Existing OG in THLB----------------------------------- NC OGMA TargetTHLB OGMA Target Recruitment OGMAs

determined based

on rules

Step 1 ogma targets
Step 1:OGMA targets

  • Biodiversity emphasis affects OGMA targets:

  • Intermediate and high biodiversity emphasis

    • establish objectives to meet entire OGMA target immediately

    • develop and establish recruitment OGMAs

Step 1 ogma targets1
Step 1:OGMA targets

  • Low biodiversity emphasis

    • draw down to 1/3 of the OGMA target, unless target met completely in NC or timber supply analysis indicates no impact or an established HLP directs otherwise

    • develop recruitment strategy that meets entire OGMA target by the end of three rotations

Table 3 1 ogma targets ha report1
Table 3.1.OGMA Targets (ha) Report

Biodiversity Emphasis



Old Growth TargetExisting OG in NCExisting OG in THLB







OGMA Target NC


Recruitment OGMAs







Planning for old growth retention step 2 delineate ogmas
Planning for Old Growth RetentionSTEP 2: Delineate OGMAs

  • Information required :

    • OGMA Targets Report (Table 3.1)

    • colour themed maps (from Data Preparation process)

    • relevant higher level plan direction (e.g. RMZ objectives)

    • strategic land use plans (LRMPs, KBLUP, CCLUP)

    • RLUPS priorities

    • approved operational plans

    • air photos, ortho-photos, satellite images

Biological considerations 1
Biological considerations - 1

  • Review “old” or the oldest available stands first

  • No single “correct” way of addressing biological considerations to be included in OGMAs

  • Primary biological considerations (core values):

    • size (interior/no interior habitat)

    • connectivity

    • species composition

    • representation/rare ecosystems

Biological considerations 2
Biological considerations - 2

  • Don’t do the same thing everywhere

  • Consider 3 spatial scales:

    • stand

    • single LU

    • larger landscape

  • Consider likely longevity of the patch in context of the landscape over time

Biological considerations 3
Biological considerations - 3

  • Larger patches have interior habitat

  • Smaller habitats dominated by edge effects

  • Interior habitat & edge effects also influenced by shape of the OGMA

  • Consider what is needed -- several small OGMAs OR fewer large OGMAs (up to target)

Biological consideration 4
Biological Consideration - 4

  • Representation is a core concept in conservation biology -- “keeping all the pieces”

  • Representation within policy constraints -- but note significant gaps

    • generally restricted to variant due to timber impacts

  • Try to capture the range of old forest ecosystems within OGMAs

Biological consideration 5
Biological consideration - 5

  • Rare by there very nature means they are not common, however contain unique biodiversity values.

  • Where rare old forest site series are known and mapped include them in OGMAs

  • If rare is not known, reserve some of old growth budget to deal with them

    • use forest cover maps, local knowledge and CDC information to locate potentially rare ecosystems

Biological considerations 5
Biological considerations - 5

  • Connectivity:

  • Try to accommodate -- but no extra budget.

  • Considerations:

    • Consider regional connectivity

    • Maintain linkages for movement, e.g., low passes in otherwise mountainous/steep terrain

    • Distance between older patches (relates to probability of moving between patches)

    • Stand structure can increase “connectivity”

Delineating ogmas biodiversity considerations
Delineating OGMAs - Biodiversity Considerations

OGMA targets:

NC 200 ha

THLB 500 ha

Step 2 operational considerations
Step 2: Operational Considerations

  • Minimize impacts to forest licencees by:

    • where suitable, use most constrained THLB first

    • avoid locating OGMAs over approved category A cutblocks (exception - known rare ecosystem)

    • avoid locating OGMAs where they will impact main access routes or isolate harvestable timber

Operational considerations 2
Operational Considerations - 2

  • Operational activities permitted in OGMAs which should proceed in a manners sensitive to old growth values:

    • mineral or gas exploration and development activities

    • range use

    • haul road construction (only if no other reasonable and cost effective options exist)

Operational considerations 3
Operational Considerations -3

  • OGMAs are intended to be areas where commercial harvesting is normally prohibited

  • If operational activities are required, proceed sensitive to old growth values

  • If operational activities significantly impact old growth attributes, OGMA location should be reassessed.

Delineating ogmas operational considerations
Delineating OGMAs–Operational Considerations

OGMA targets:

NC 200 ha

THLB 500 ha

Delineate ogmas summary of steps
Delineate OGMAs Summary of Steps

  • Determine old growth targets by variant for THLB and NC

  • Assess all potential patches (considering all BECs together)

  • Determine primary biological considerations

    • Ideally, ground-truth “old” attributes of potential OGMAs

    • Record presence of features/attributes (for each patch for ranking and future reference)

Delineate ogmas summary of steps 2
Delineate OGMAsSummary of Steps - 2

  • Rank potential OGMAs

  • Design to balance OGMA biological values with operational considerations

Step 2 delineate ogmas recruitment
Step 2: Delineate OGMAsRecruitment

  • Recruitment occurs where not enough existing old forest available to meet targets

  • - applies to both NC and THLB

  • - use the biologically best NC or THLB when recruiting.

Step 2 delineate ogmas recruitment1
Step 2: Delineate OGMAsRecruitment

  • Developing recruitment strategies

  • Immediate recruitment

    • below old growth target in intermediate or high emphasis

    • below 1/3 old growth target in low emphasis

  • Recruitment over 3 rotations

    • applies to low biodiversity emphasis LUs

Step 2 delineate ogmas recruitment2
Step 2: Delineate OGMAsRecruitment

  • Locating recruitment OGMAs:

    • follow biodiversity and operational considerations

    • consider suitable (I.e biologically equivalent) younger forest in the NC prior to impacting the THLB

    • high and intermediate emphasis LUs

      • choose forested areas that will maximize biodiversity conservation values in the shortest possible time frame

Planning for old growth retention step 3 assess ogmas
Planning for Old Growth RetentionStep 3: Assess OGMAs

  • Prepare tabular summary of OGMAs by Landscape Unit: (Table 3.2)

    • document actual OGMA placed in NC and the THLB

    • document recruitment OGMAs

    • documents priorities for OGMA establishment

  • Develop a data base to track individual OGMA and their attributes

    • documentation of biodiversity attributes captured in each OGMA

Ogma exercise
OGMA exercise

  • Group Exercise

    • 4- 5 people/group

  • Materials

    • a set of various colour-themed maps

    • LUPG chapter 3

    • Workbook/handout

Ogma exercise1
OGMA exercise

  • Time

    • 1 hour basic exercise, 30 - 45 minutes to report out/discuss

    • 30 minutes to assess wildcards, 30 minutes to report out

Ogma exercise2
OGMA exercise

  • Purpose

  • To carry out the ‘accounting step’ - calculate the old growth targets for the NC and THLB

  • To think about the ecological and operational considerations (included in the LUPG), when locating OGMAs

  • To promote group discussion and group solutions regarding options for OGMA locations

  • To delineate OGMAs up to the target level

Ogma exercise3
OGMA exercise

  • Wild Cards

  • will add a few complications to the scenario once you have completed the basic exercise as defined in the workbook/handout

    • IWMS

    • rare ecosystems

    • category A approved cutblocks