UNEVEN-AGED MANAGEMENT NORTHWEST CERTIFIED FORESTRY

Transcription

1 UNEVEN-AGED MANAGEMENT NORTHWEST CERTIFIED FORESTRY Rolf Gersonde, 6/6/2015

2 Uneven-aged Management in 90 Minutes 2 Silviculture Background Forest Ecology Management Tools and Stocking Control Multi-aged Management Regime Group Selection Example Single Tree Selection Example Tools for Assessment and Management Operations

3 What is Uneven-aged Management? 3 Even-aged age-class Forestry Uneven-aged Management System

4 4 Managing Multi-aged Stands

5 5 Alfred Möller, 1922 Dauerwald Continuous Cover Forestry

6 6 Ecological Basis - Diameter distribution of natural stands - Small-scale disturbance regime Tree Count Meyer 1952 Tree Diameter

7 7 History of Uneven-aged Management in the Pacific Northwest Kirkland and Brandstrom 1936 Leo Isaac 1956

8 8 Silvicultural System System of coordinated regeneration, tending, control, and harvest treatments Even-aged System Clear Cut Seed Tree Shelterwood Thinning Two-aged System Variable Retention Coppice with Reserves Uneven-aged system Group Selection Thinning Single Tree Selection

9 9 Seed-Tree and Shelterwood Regeneration Methods Shelterwood

10 10 Continuum of Silvicultural Approaches

11 Forest Stand Dynamics Stand development stages, disturbance dynamics, habitat 11 S Franklin and Van Pelt Stand Initiation Stem Exclusion Understory Re-Initiation Diversification Vertical - Horizontal

12 Crown Differentiation 12 D Dominant C Co-dominant I Intermediate S Overtopped M Mortality Emmingham and Elwood 2004

13 Height vs. Diameter Growth 13 Height Stem Diameter Age (years) Douglas-fir grown at three different densities, from Marshall and Curtis, 2002

14 14 Competitive vs. Agent Mortality

15 Natural Regeneration - Understory Establishment Stage 15 Seed Source Species, seed year, predation Environment Temp, water, light Seed bed Soil, competition, mycorrhiza

16 16 Understory Development Identify Shade Tolerance Douglas-fir Grand fir Western white pine Western hemlock

17 17 Shade tolerance Ranking of western tree species (Daniel et al. 1979) Very tolerant Tolerant Intermediate Intolerant Very intolerant Western hemlock Pacific yew Western redcedar Grand fir Big-leaf maple Douglas-fir Ponderosa pine Lodgepole pine Cottonwoods Larch Pacific silver fir Vine maple Sitka spruce Western white pine Red alder

18 18 Understory Growth Morphological Plasticity Pacific silver fir Noble fir Sun and shade foliage Terminal vs. lateral growth Apical dominance Western hemlock

19 19 Mixed-species Forests

20 20 Mixed-Species Stands Species specific Growing space Height growth Stratification Shade tolerance Senescence Facilitation Forage

21 21 Growing Space - Resources, leaf area, basal area, and allocation

22 22 Growing Space Allocation Trees versus Stands Volume Growth Stand Tree Stand Density

23 Growing Space Allocation 23 80% Growing Space In Overstory 20% Growing Space In Understory

24 24 Growing Space Allocation Overstory versus Understory Tree Growth Overstory Density

25 Managing Uneven-aged Stands 25 Manage stand density to: 1. Sustain growth of all stand components 2. Maintain stand structure 3. Replace tree mortality and harvest through regeneration # Sustainability Indicators Transformation

26 26 Stand Volume and Rotation in Even-aged System Stand Volume Stand Age Rotation Age

27 Cutting Cycle Age TPA BA 180 Stand Density 1. Age TPA BA Age 80/ TPA BA Age TPA BA 120 Stand Age

28 Cutting Cycle cutting cycle length depends on cutting intensity and growth rates 28 Cutting Cycle Length Stand Volume - Density - Growing Space Removed Timber Volume Growth Rate Stand Age

29 29 Yield Tables for Even-aged Stands

30 30 Group Selection System

31 Group Selection System - Area Control Method of Uneven-aged Management Regeneration Thinned Matrix PCT Activities: Group-Selection Harvest Natural Regeneration Planting Pre-comm. Thinning Commercial Thinning Understory Thinning Un-thinned Large Tree

32 Scheduling Group Selection Treatments Area Control Method Stand Area 20% Cutting Cycle Group Selection PCT Commercial Thin Commercial Thin Group Selection PCT 20% Commercial Thin Group Selection PCT Commercial Thin Commercial Thin Group Selection 20% Commercial Thin Commercial Thin Group Selection PCT Commercial Thin Commercial Thin 20% Commercial Thin Commercial Thin Group Selection PCT Commercial Thin 20% Commercial Thin Commercial Thin Group Selection PCT Stand Age

33 33 Group Selection System Prescription Matrix Uneven-aged Group Selection Management Regime Activity Conditions Prescription (SI 110) Regeneration Reforestation Density Management Pre-commercial Thinning Commercial Thinning Understory Thinning at cutting cycle at year 1 where cover <40% top height 15 ft. or age >15 yrs at 55% of max SDI (or BA > 260 sqft) at 2nd CT, after CT where WH understory established 20% in 1-2 ac gaps, min age 35 yrs, Cutting Cycle 20 yrs nat.regen WH 200 DF, 50 RA, 100 RC, Thin to 250 TPA 160 TPA thin from below or 30% CF volume, possible 2nd CT remove 20% of CFvol if understory h/d<100 Thin to 150 TPA, Habitat Enhancement Riparian Management Zone Dead wood applies to CT and group selection retain 20 TPA >12"DBH or retain 20-40% cover in RMZ, underplant 100 RC/ac retain 2 TPA as snags and 2 TPA as down wood at Regeneration

34 Single Tree Selection 34

35 35

36 Single Tree Selection developing a guide curve from tree count and diameter Tree Tally by 2 inch Diameter Class Number of Trees Tree Diameter 36

37 Single Tree Selection Guide Curve: Total basal area Maximum Diameter slope Target Number Actual Number At each cutting cycle we thin trees in classes that exceed the guide curve. 37

38 38 Uneven-aged Management Forest Products Marketing Product Diversity

39 39 Assessing growth and control density of all tree sizes and species in the same stand

40 40 Assessment of Growth Overstory diameter increment Diameter growth rates

41 41 Assessment of Growth Mid-canopy trees Crown ratio Height-diameter ratio

42 42 Assessment of Growth Understory trees Growth of terminal shoot versus lateral branches - Douglas-fir Large Gap >30% Light Small Gap ~20% Light Under Canopy >20% Light

43 43 Tools For Assessment Diameter Distribution Tree Diameter Tally Sheet DBH Class Plot 1 Plot 2 Plot 3 Sum (Inches) Count Count Count Tree Count

44 44 Tools For Assessment Diameter Distribution of Even-aged Stand 15 Tree Count Diameter Class (Midpoint, Inch)

45 45 Growing Space Distribution Diameter Distribution of Multi-aged Stand Tree Count / Basal Area Diameter Class (Midpoint, Inch)

46 46 Growing Space Distribution Basal Area of Diameter Classes Tree Count / Basal Area Diameter Class (Midpoint, Inch)

47 Permanent Sample Plots 47 Species composition Size classes Stand volume Diameter growth Height growth Mortality Harvest

48 48 Permanent Sample Plots Diameter distribution and increment Tree Count Tree Count Diameter Class (Midpoint, Inch) Diameter Class (Midpoint, Inch) Inventory Period 1: Diameter distribution Inventory Period 2: Diameter distribution Diameter class transition

49 Thinning and Harvest 49 Objectives Timing Stocking Control, Regeneration, and Timber Recovered previous harvest, market conditions, boat payments Make a plan Long-term plan as Guide not Rule Creating habitat CWD, snags, canopy layers

50 Tree Selection and Marking 50 Creating growing space Selection guide Basal area Diameter distribution Mark your Trees

51 Harvest Layout 51 Units and boundaries Uneven-aged stands are more variable Forest Practices Roads and trails Long-term planning and reuse Collaboration

52 Group Selection System Planning operations Layout for thinning and group selection harvest Location for yarding corridors Tracking regeneration Prescriptions for matrix thinning Estimating stocking and ingrowth 52

53 53 Implementation

54 Equipment Options 54 Equipment Options

55 55

56 56

57 57 Harvest Impacts