Root Volume and Growth of Ponderosa Pine and Douglas-Fir Seedlings: A Summary of Eight Growing Seasons

Authors: Rose, R.; Haase, D. L.; Kroiher, F.; Sabin, T.

Source: Western Journal of Applied Forestry, Volume 12, Number 3, 1 July 1997 , pp. 69-73(5)

Publisher: Society of American Foresters

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Abstract:

This is the final summary of two studies on the relationship between root volume and seedling growth; early results were published previously. Survival, growth, and stem volume were determined for 2+0 ponderosa pine (Pinus ponderosa) and Douglas-fir (Pseudotsuga menziesii) seedlings after 8 growing seasons. For each species, seedlings from three seedlots were assigned to one of three root-volume categories [<4.5 cm³ (RV1), 4.5-7 cm³ (RV2), and >7 cm³ (RV3) for ponderosa pine; <9 cm³ (RV1), 9-13 cm³ (RV2), and >13 cm³ (RV3) for Douglas-fir]. On a dry harsh ponderosa pine site on the eastern slopes of Mt. Hood in Oregon, where gopher and cattle damage decreased the number of seedlings, more seedlings in the highest root-volume category survived (70%) than in the smaller root-volume categories (62% and 50%). Douglas-fir on a good site in the Coast Range of Oregon showed significantly greater height and stem volume for the largest root-volume category, whereas annual shoot growth and survival did not differ. Root volume is one of several potentially useful criteria for predicting long-term growth and survival after outplanting. West. J. Appl. For. 12(3):69-73.

Document Type: Journal article

Affiliations: 1: Department of Forest Science, College of Forestry, Oregon State University, Corvallis, OR 97331

Publication date: 1997-07-01

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