Applying density management to develop late successional features
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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


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


Applying density management to develop late successional features

OverstoryCover

Willamette National Forest: Douglas-fir

Beggs 2005


Applying density management to develop late successional features

Overstory cover

McDonald Forest: Douglas-fir, previously thinned

Newton and Cole 2004


Applying density management to develop late successional features

Crown structures

Suislaw National Forest: Douglas-fir

Chan et al. 2005


Applying density management to develop late successional features

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


Applying density management to develop late successional features

Foliage Height Diversity Index

3 to 5 years after thinning

Beggs 2005


Applying density management to develop late successional features

Impact of thinning on volume and

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


Applying density management to develop late successional features

Acceleration of “dominant old-growth” trees:

Diameter growth of largest 6 tpa

Growth (cm / yr)

Willamette National Forest

Beggs 2005


Applying density management to develop late successional features

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


Applying density management to develop late successional features

Seedling survival

McDonald: Douglas-fir

Newton and Cole 2004


Applying density management to develop late successional features

Harvesting damage to regeneration

McDonald Forest

Newton and Cole 2004


Applying density management to develop late successional features

Impact of

light availability

on seedling

growth

Maas-Hebner et al. 2005


Applying density management to develop late successional features

Impact of overstory density

Western Hemlock

Newton and Cole 2004


Applying density management to develop late successional features

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


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


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