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

K.W. Seidel

doi:10.2737/PNW-RP-275

Treesearch

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

Informally Refereed

Authors:

K.W. Seidel

Year:

1980

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-275

Source:

Res. Pap. PNW-RP-275. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 9 p

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Download (PDF 1.30 MB): https://research.fs.usda.gov/download/treesearch/21255.pdf

Abstract

The 2- and 5-year diameter and height growth of suppressed grand fir (Abies grandis (Dougl. ex D. Don) Lindl.) advance reproduction was measured in central Oregon after the overstory was removed. Multiple regression analyses were used to predict growth response as a function of individual tree variables. The resulting equations, although highly significant, explained only 17 to 44 percent of the variation in growth. Live crown ratio gave the best single variable correlation for both diameter and height growth. Height growth after release was similar to growth before release. Only vigorous advance reproduction having live crown ratios of 50 percent or more should be considered as potential crop trees.

Keywords

Increment (height), increment (diameter), advance growth, release, grand fir, Abies grandis

Citation

Seidel, K.W. 1980. Diameter and height growth of suppressed grand fir saplings after overstory removal. Res. Pap. PNW-RP-275. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 9 p