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

K.W. Seidel

doi:10.2737/PNW-RP-344

Treesearch

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

Informally Refereed

Authors:

K.W. Seidel

Year:

1985

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-344

Source:

Res. Pap. PNW-RP-344. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 28 p

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Download (PDF 2.38 MB): https://research.fs.usda.gov/download/treesearch/25277.pdf

Abstract

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

Citation

Seidel, K.W. 1985. Growth response of suppressed true fir and mountain hemlock after release. Res. Pap. PNW-RP-344. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 28 p