Levels-of-growing-stock cooperative study in Douglas-fir: report no. 12—The Iron Creek Study, 1966-89.

Robert O. Curtis; Gary W. Clendenen

doi:10.2737/PNW-RP-475

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Levels-of-growing-stock cooperative study in Douglas-fir: report no. 12—The Iron Creek Study, 1966-89.

Informally Refereed

Authors:

Robert O. Curtis, Gary W. Clendenen

Year:

1994

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-475

Source:

Res. Pap. PNW-RP-475. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 77 p

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Abstract

Results of the Iron Creek installation of the levels-of-growing-stock study in Douglasfir (Pseudotsuga menziesii (Mirb.) Franco) are summarized. To age 42 (planned completion of the experiment) volume growth in this site II Douglas-fir plantation has been strongly related to level of growing stock, partially offsetting the decrease in volume growth percent expected with increasing growing stock. Basal area growth-growing stock relations were much weaker than those for volume. Marked differences in tree size distributions have resulted from thinning. Periodic annual volume increments are two to three times greater than mean annual increments at age 42; this stand is far from culmination. Results in general are similar to those reported for other installations in the series on medium to good sites.

Keywords

thinning, growing stock, growth and yield, stand density, Douglas-fir, Pseudotsuga menziesii, series—, Douglas-fir LOGS

Citation

Curtis, Robert O.; Clendenen, Gary W. 1994. Levels-of-growing-stock cooperative study in Douglas-fir: report no. 12—The Iron Creek Study, 1966-89. Res. Pap. PNW-RP-475. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 77 p