Extended rotations and culmination age of coast Douglas-fir: old studies speak to current issues.

Curtis, Robert O.

doi:10.2737/pnw-rp-485

Cited by 31 publications

(29 citation statements)

References 5 publications

(8 reference statements)

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“…2 Sawmill grade logs, whereas the thinned areas yielded 94 percent (95-TH) and 92 percent (80-TH) in these grades. Although no precise records are available, the strategy was to thin from below and attempt to remove mortality and defective trees (Curtis 1995). This practice presumably improved log grade in the residual stand, thereby eliminating the trees that would later yield low-grade logs.…”

Section: Millmentioning

confidence: 99%

“…Little information is available about the conditions in these stands at the time they were established, but Curtis (1995) concluded that both Port Blakely installations were probably initially widely spaced. Curtis bases this conclusion on the number of trees present when the stands were first thinned as well as evidence of mortality before thinning.…”

Section: ----------Numbers C ----------mentioning

confidence: 99%

“…These trees are referred to as the SMC trees. Curtis (1995) and Stinson (1999) give details about the stand characteristics and the treatment history for the Port Blakely thinning trials. The older installation, designated by Port Blakely as XT-1, was established in a 47-year-old stand in 1948 and harvested at age 95.…”

Section: Introductionmentioning

confidence: 99%

“…The older installation, designated by Port Blakely as XT-1, was established in a 47-year-old stand in 1948 and harvested at age 95. Curtis (1995) characterizes the thinning regime as light. The younger installation, known as XT-7, was established in a 42-year-old stand in 1958 and harvested at age 80.…”

Section: Introductionmentioning

confidence: 99%

“…The younger installation, known as XT-7, was established in a 42-year-old stand in 1958 and harvested at age 80. Curtis (1995) characterizes the treatment of this installation as a heavy thinning. Trees were removed from the Port Blakely thinning trials in summer 1996 to determine various wood characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Log and lumber grades as indicators of wood quality in 20- to 100-year-old Douglas-fir trees from thinned and unthinned stands.

Barbour¹,

Parry²

2001

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This report examines the differences in wood characteristics found in coastal Pacific Northwest Douglas-fir (Pseudotsuga mensziesii (Mirb.) Franco) trees harvested at the age of 70 to 100 years old to wood characteristics of trees harvested at the age of 40 to 60 years. Comparisons of differences in domestic log grades suggest that the proportion of log volume in the higher grades (Special Mill and No. 2 Sawmill) increased with both stand age and tree size. Simulation of lumber grade yields based on log characteristics suggests that yields of higher grades of lumber increased until about age 60 to 70, and then leveled off over the rest of the age range examined in this analysis. We included structural lumber products in the analysis but not higher value appearance grade products, and some evidence suggests that yields of these products might have begun to increase in the oldest trees. The analysis also showed that the younger trees had larger branches and more juvenile wood, possibly because they had been grown in stands that received a higher level of early stand management than the older trees. If these young trees were grown to the ages of 70 to 100, they likely would not produce the same log and lumber grade yields found in the older trees we examined.

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Section: Millmentioning

confidence: 99%

Section: ----------Numbers C ----------mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Log and lumber grades as indicators of wood quality in 20- to 100-year-old Douglas-fir trees from thinned and unthinned stands.

Barbour¹,

Parry²

2001

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Evaluating carbon storage, timber harvest, and habitat possibilities for a Western Cascades (USA) forest landscape

Kline

Harmon

Spies

et al. 2016

Ecological Applications

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Forest policymakers and managers have long sought ways to evaluate the capability of forest landscapes to jointly produce timber, habitat, and other ecosystem services in response to forest management. Currently, carbon is of particular interest as policies for increasing carbon storage on federal lands are being proposed. However, a challenge in joint production analysis of forest management is adequately representing ecological conditions and processes that influence joint production relationships. We used simulation models of vegetation structure, forest sector carbon, and potential wildlife habitat to characterize landscape‐level joint production possibilities for carbon storage, timber harvest, and habitat for seven wildlife species across a range of forest management regimes. We sought to (1) characterize the general relationships of production possibilities for combinations of carbon storage, timber, and habitat, and (2) identify management variables that most influence joint production relationships. Our 160 000‐ha study landscape featured environmental conditions typical of forests in the Western Cascade Mountains of Oregon (USA). Our results indicate that managing forests for carbon storage involves trade‐offs among timber harvest and habitat for focal wildlife species, depending on the disturbance interval and utilization intensity followed. Joint production possibilities for wildlife species varied in shape, ranging from competitive to complementary to compound, reflecting niche breadth and habitat component needs of species examined. Managing Pacific Northwest forests to store forest sector carbon can be roughly complementary with habitat for Northern Spotted Owl, Olive‐sided Flycatcher, and red tree vole. However, managing forests to increase carbon storage potentially can be competitive with timber production and habitat for Pacific marten, Pileated Woodpecker, and Western Bluebird, depending on the disturbance interval and harvest intensity chosen. Our analysis suggests that joint production possibilities under forest management regimes currently typical on industrial forest lands (e.g., 40‐ to 80‐yr rotations with some tree retention for wildlife) represent but a small fraction of joint production outcomes possible in the region. Although the theoretical boundaries of the production possibilities sets we developed are probably unachievable in the current management environment, they arguably define the long‐term potential of managing forests to produce multiple ecosystem services within and across multiple forest ownerships.

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Medium‐term effects of active management on the structure of mature Douglas‐fir (Pseudotsuga menziesii) stands

Williams

Powers

2019

Ecosphere

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Citation: Williams, N., and M. Powers. 2019. Medium-term effects of active management on the structure of mature Douglas-fir (Pseudotsuga menziesii) stands.Abstract. We developed an observational study to (1) examine differences in the structure of mature Douglas-fir stands representing thinned, structural retention harvest and unmanaged conditions, and (2) assess the extent to which active management in mature stands expedites development of old-growth structure, relative to two old-growth indices. Time since treatment averaged 38 and 22 yr in thinned and retention harvest conditions, respectively, and stand age ranged from 106 to 193 yr when sampled. Differences in stand structure were apparent between all three management conditions, with attributes associated with stumps, live tree diameter diversity, understory vegetation, and vertical foliage structure being the strongest individual drivers of these differences. Mean old-growth index scores were lower than expected of true old-growth for each of the management conditions examined here, but were not significantly different between thinned and unmanaged stands. Our results suggest thinning in mature stands may promote certain elements of old-growth structure, including foliage height diversity, but also indicate the need for provisions against the depletion of dead wood resources. Stumps are an understudied dead wood structure, and in actively managed mature stands, our results imply that stumps may provide a degree of functional substitution where down log availability is low.

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Extended rotations and culmination age of coast Douglas-fir: old studies speak to current issues.

Abstract: Curtis, Robert O. 1995. Extended rotations and culmination age of coast Douglas-fir: old studies speak to current issues. Res. Pap.

Cited by 31 publications

References 5 publications

Log and lumber grades as indicators of wood quality in 20- to 100-year-old Douglas-fir trees from thinned and unthinned stands.

Log and lumber grades as indicators of wood quality in 20- to 100-year-old Douglas-fir trees from thinned and unthinned stands.

Evaluating carbon storage, timber harvest, and habitat possibilities for a Western Cascades (USA) forest landscape

Medium‐term effects of active management on the structure of mature Douglas‐fir (Pseudotsuga menziesii) stands

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