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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

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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


Studies
Studies Features


Late successional features
Late successional features: 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: Features

  • Overstory cover

  • Canopy layers

  • Large, dominant trees

  • Tree species mixtures, including hardwoods

  • Amount and composition of understory vegetation

  • Conifer regeneration

  • Spatial variability


Applying density management to develop late successional features

Overstory FeaturesCover

Willamette National Forest: Douglas-fir

Beggs 2005


Applying density management to develop late successional features

Overstory cover Features

McDonald Forest: Douglas-fir, previously thinned

Newton and Cole 2004


Applying density management to develop late successional features

Crown structures Features

Suislaw National Forest: Douglas-fir

Chan et al. 2005


Applying density management to develop late successional features

Foliage Height Diversity Index Features

35 m

30 m

25 m

20 m

15 m

10 m

5 m

0 m

<

<

STAND 1

STAND 2

STAND 3


Applying density management to develop late successional features

Foliage Height Diversity Index Features

3 to 5 years after thinning

Beggs 2005


Applying density management to develop late successional features

Impact of thinning on volume and Features

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


Applying density management to develop late successional features

Acceleration of “dominant old-growth” trees: Features

Diameter growth of largest 6 tpa

Growth (cm / yr)

Willamette National Forest

Beggs 2005


Applying density management to develop late successional features

Overstory Mortality (%) Features

Mostly competition related

Beggs 2005


Late successional features2
Late successional features: 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: 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 Features

Adapted from Maas-Hebner et al. 2005 FEM


Seedling survival after 8 growing seasons
Seedling survival after 8 growing seasons Features

Adapted from Maas-Hebner et al. 2005 FEM


Applying density management to develop late successional features

Seedling survival Features

McDonald: Douglas-fir

Newton and Cole 2004


Applying density management to develop late successional features

Harvesting damage to regeneration Features

McDonald Forest

Newton and Cole 2004


Applying density management to develop late successional features

Impact of Features

light availability

on seedling

growth

Maas-Hebner et al. 2005


Applying density management to develop late successional features

Impact of overstory density Features

Western Hemlock

Newton and Cole 2004


Applying density management to develop late successional features

Effects of weed control Features

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 thinned stands

  • 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


Applying density management to develop late successional features

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


Questions
Questions for late successional habitat,


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