Diameter and height growth of suppressed grand fir saplings after overstory removal.

Seidel, Kenneth W.

doi:10.2737/pnw-rp-275

Cited by 20 publications

(23 citation statements)

References 2 publications

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“…Specific study objectives were: (1) to determine and compare rates of diameter and height growth before and after release for each species, (2) to determine how soon after release the increased growth response occurs, and (3) to screen specific variables to use in models for predicting diameter and height growth. This study expands on an earlier study that was limited to one species and a single stand (Seidel 1980b). …”

Section: Introductionsupporting

confidence: 54%

“…It is also evident that the most vigorous trees grow the fastest and that the two individual tree variables most strongly correlated with tree vigor are live crown ratio and past 5-year height growth (Ferguson and Adams 1979, McCaughey and Schmidt 1982, Seidel 1980b. Thus, advance reproduction can easily be evaluated in the field to determiners management potential.…”

Section: Discussionmentioning

confidence: 99%

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Growth response of suppressed true fir and mountain hemlock after release.

Seidel¹

1985

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The diameter and height growth of advance reproduction of suppressed true fir (Abies spp.) and mountain hemlock (Tsuga mertensiana (Bong.) Carr.) was measured in south-central Oregon after release by overstory removal in clearcuttings, shelterwood units, and uncut stands. Postrelease growth was greatest in clearcuttings, intermediate in shelterwood cuttings, and slowest in uncut stands. Multiple regression analyses were used to predict growth response as a function of tree and stand variables. Overstory basal area, live crown ratio, and past 5-year height growth accounted for the most variation in diameter and height growth after release. Vigorous advance reproduction having live crown ratios greater than 50 percent are the best candidates for crop trees.Keywords: Growth response, release, suppression (tree), advance growth, true fir, mountain hemlock.In 1983 and 1984, a study was conducted in the Cascade Range in south-central Oregon to obtain information about the diameter and height growth response of suppressed advance reproduction of grand fir (Abies grandis (Dougl. ex D. Don) Lindl.), Shasta red fir (Abies magnifica var. shastensis Lemm.), and mountain hemlock (Tsuga mertensiana (Bong.) Carr.) after release by removal of the overstory. The purpose was to compare rates of diameter and height growth before and after release, to determine when increased growth occurs, and to develop models to predict diameter and height growth after release as a function of tree and stand variables, such as live crown ratio and basal area.The study areas were clearcut and shelterwood units and uncut stands in upper slope, mixed conifer/snowbrush-chinkapin and mountain hemlock/grouse huckleberry communities in the Deschutes and Winema National Forests, south-central Oregon. Growth patterns 5 years before and 10 to 20 years after release of the trees were determined by sectioning trees.Both diameter and height growth increased after release from two to four times the prerelease rate for both fir and hemlock. Acceleration of growth generally occurred within 5 years after release with the most rapid growth occurring on clearcut units. Growth curves had a sigmoid form showing constant growth before release, a rapid acceleration during the first 8 to 9 years after release, followed by a flattening of the curves from 10 to 20 years after release.Residual overstory basal area, live crown ratio, and past 5-year height growth were the three variables accounting for most of the variation in diameter and height growth after release. Growth of the advance reproduction after release was directly proportional to live crown ratio or past height growth and inversely proportional to overstory stand density. Both fir and hemlock responded to release regardless of age.The.best potential crop trees are vigorous advance reproduction having live crown ratios greater than 50 percent and those with the greatest height growth before release. Releasing these trees by removing the overstory and by thinning when needed will not only greatly increase grow...

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Section: Introductionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Growth response of suppressed true fir and mountain hemlock after release.

Seidel¹

1985

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“…Pre-release height growth rate has been reported to be positively correlated with survival Ruel et al 1995) and post-release growth rates (Ferguson and Adarns 1980, Seidel 1980, Helms and Standiford 1985, Oliver 1985, Mceaughey and Ferguson 1988, Murphy et al 1999 for several conifer species. Because there is usually a direct link between stress and growth reduction, many authors are inclined to use growth rate as a measure of stress (Coley et al 1985).…”

Section: Height Growthmentioning

confidence: 99%

“…Live crown ratio, defined as the length of the live crown over total height, has often been identified as one of the best indicators of vigour for shade-tolerant conifers (Seidel 1980, Helms and Standiford 1985, Rue1 et al 1995. The amount of live crown retained in shaded conifer species probably varies between genera as reported by Takahashi (1 996) and Larivikre (1998) for fir and spruce.…”

Section: Live Crown Ratiomentioning

confidence: 99%

“…Part of this delayed response could be attributed to the fact that height growth is often predetermined in the previous growing season (Aussenac 1977, Kneeshaw et al 1998) but this would not be sufficient to explain growth reductions or delays exceeding one year found in many studies. On the other hand, height growth response can also be immediate, especially for the smaller regeneration (Seidel 1989;Doucet 1991, 1993;Paquin and Doucet 1992b). Messier et al (1999a) suggest that the light requirements of seedlings increase with size.…”

Section: Introductionmentioning

confidence: 99%

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Morphological indicators of growth response of coniferous advance regeneration to overstorey removal in the boreal forest

Ruel¹,

Messier²,

Doucet³

et al. 2000

The Forestry Chronicle

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Christian Messier2, Ren6 ~o u c e t~, Yves Claveau2 and Phil Comeau4Regeneration of forest stands through the preservation of existing advance regeneration has gained considerable interest in various regions of North America. The effectiveness of this approach relies on the capacity of regeneration to respond positively to overstory removal. Responses of advance regeneration to release is dependent on tree characteristics and site conditions interacting with the degree of physiological shock caused by the sudden change in environmental conditions. This paper presents a review of the literature describing the relationships between morphological indicators and the advance regeneration response to canopy removal. It focuses primarily on the following species: jack pine (Pinus banksiana Lamb.), lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.), black spruce (Picea mariana (Mill.) B.S.P.), interior spruce (Picea glauca x engelmannii), white spruce (Picea glauca (Moench) Voss), balsam fir (Abies balsamea (L.) Mill.), and subalpine fir (Abies lasiocarpa (Hook.) Nutt). Pre-release height growth has been found to be a good indicator of post-release response for many species. Live-crown ratio also appears to be a good indicator of vigour for shade-tolerant species. The ratio of leader length to length of the longest lateral at the last whorl could serve to describe the degree of suppression before harvest for shade-tolerant species. Number of nodal and internodal branches or buds has been found to be related with vigour for many species. Logging damage has been shown to be an important determinant of seedling response to overstory removal. In contrast, heighddiameter ratio has limited value for predicting response to release since it varies with site, species and other factors. No clear relationship between age, height at release and response to release could be demonstrated. This paper also suggests the use of combined indicators and cntical threshold values for these indicators.Key words: advance regeneration, careful logging, vigour, clearcutting I La protection de la rkgknkration prkttablie a fait l'objet d'un inter& croissant au cows des derniieres dtcennies en Amkrique du Nord. L'efficacitt de cette approche repose toutefois sur la capacit6 de cette rCgkn6ration B rkagir positivement h la coupe. La rkaction de la rkgtnkration prkktablie dkpend de ses caractkristiques au moment de la coupe et de leur interaction avec les conditions de station et le choc causk par le pr6lhement du couvert principal. Cet article passe en m e les relations entre diffkrents indicateurs morphologiques et la rkaction de la rkgknkration prkktablie aprks coupe. Les espkces vistes sont : le pin gris (Pinus banksiana Lamb.), le pin de Murray (Pinus contorta Dougl. var. latifolia Engelm.), l'tpinette noire (Picea mariana (Mill.) B.S.P.), l'kpinette blanche (Picea glauca (Moench) Voss), le sapin baurnier (Abies balsamea (L.) Mill.) et le sapin subalpin (Abies lasiocarpa (Hook.) Nutt). La croissance en hauteur avant coupe a kt6 relike...

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Stand structure and growth of Abies magnifica responded to five thinning levels in northeastern California, USA

Zhang¹,

Oliver²

2006

Forest Ecology and Management

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Diameter and height growth of suppressed grand fir saplings after overstory removal.

Cited by 20 publications

References 2 publications

Growth response of suppressed true fir and mountain hemlock after release.

Growth response of suppressed true fir and mountain hemlock after release.

Morphological indicators of growth response of coniferous advance regeneration to overstorey removal in the boreal forest

Stand structure and growth of Abies magnifica responded to five thinning levels in northeastern California, USA

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