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Applying Density Management to Develop Late Successional Features. Klaus J. Puettmann Oregon State University. Studies. Late successional features:. Overstory cover Canopy layers Large, dominant trees Tree species mixtures, including hardwoods

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applying density management to develop late successional features

Applying Density Management to Develop Late Successional Features

Klaus J. Puettmann

Oregon State University

late successional features
Late successional features:
  • Overstory cover
  • Canopy layers
  • Large, dominant trees
  • Tree species mixtures, including hardwoods
  • Amount and composition of understory vegetation
  • Conifer regeneration
  • Spatial variability
late successional features1
Late successional features:
  • Overstory cover
  • Canopy layers
  • Large, dominant trees
  • Tree species mixtures, including hardwoods
  • Amount and composition of understory vegetation
  • Conifer regeneration
  • Spatial variability
slide5

OverstoryCover

Willamette National Forest: Douglas-fir

Beggs 2005

slide6

Overstory cover

McDonald Forest: Douglas-fir, previously thinned

Newton and Cole 2004

slide7

Crown structures

Suislaw National Forest: Douglas-fir

Chan et al. 2005

slide8

Foliage Height Diversity Index

35 m

30 m

25 m

20 m

15 m

10 m

5 m

0 m

<

<

STAND 1

STAND 2

STAND 3

slide9

Foliage Height Diversity Index

3 to 5 years after thinning

Beggs 2005

slide10

Impact of thinning on volume and

on growth rate (i.e., slope of volume curve)

slide11

Acceleration of “dominant old-growth” trees:

Diameter growth of largest 6 tpa

Growth (cm / yr)

Willamette National Forest

Beggs 2005

slide12

Overstory Mortality (%)

Mostly competition related

Beggs 2005

late successional features2
Late successional features:
  • Overstory cover
  • Canopy layers
  • Large, dominant trees
  • Tree species mixtures, including hardwoods
  • Amount and composition of understory vegetation
  • Conifer regeneration
  • Spatial variability
late successional features3
Late successional features:
  • Overstory cover
  • Canopy layers
  • Large, dominant trees
  • Tree species mixtures, including hardwoods
  • Amount and composition of understory vegetation
  • Tree regeneration
  • Spatial variability
seedling survival 8 growing seasons after thinning
Seedling survival 8 growing seasons after thinning

Adapted from Maas-Hebner et al. 2005 FEM

seedling survival after 8 growing seasons
Seedling survival after 8 growing seasons

Adapted from Maas-Hebner et al. 2005 FEM

slide17

Seedling survival

McDonald: Douglas-fir

Newton and Cole 2004

slide18

Harvesting damage to regeneration

McDonald Forest

Newton and Cole 2004

slide19

Impact of

light availability

on seedling

growth

Maas-Hebner et al. 2005

slide20

Impact of overstory density

Western Hemlock

Newton and Cole 2004

slide21

Effects of weed control

Western hemlock

Blodgett

Newton and Cole 2004

variation in overstory cover when gaps in interspersed in thinned stands
Variation in overstory cover when gaps in interspersed in thinned stands

40

35

30

25

Frequency

20

15

10

5

0

0

10

20

30

40

50

60

70

80

90

100

Overstory Cover (%)

Beggs 2005

conclusions
Conclusions
  • Different late-successional components require different management strategies
  • Tradeoffs in terms of stand growth
  • Overstory and understory conditions before thinning are good indicators of responses
  • Some flexibility in thinning intensities
  • Repeated entries likely required
slide24
Density management needs to be an integral part of managing for late successional habitat,

but additional measures, (gaps, snag creation, or remnant trees) are also necessary

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