Skip to Main Content
Growth and development of ponderosa pine on sites of contrasting productivities: relative importance of stand density and shrub competition effectsAuthor(s): Jianwei Zhang; William W. Oliver; Matt D. Busse
Source: Canadian Journal of Forest Research 36:2426-2438
Publication Series: Scientific Journal (JRNL)
View PDF (217 KB)
DescriptionEffects of stand density and shrub competition on growth and development were compared across a gradient of study sites. Challenge, the most productive site, is located in the foothills of the Sierra Nevada, northern California. Pringle Falls is of intermediate productivity in the rain shadow of the central Oregon Cascades. Trough Springs Ridge is the poorest site with minimally-developed soils in California’s North Coast Range. Treatments included a minimum of four stand densities, from 150 to 2700 trees ha-1, in combination with at least no or full shrub removal. Challenge produced almost twice as much tree volume as Pringle Falls, and about three times the volume of Trough Springs Ridge. Regardless of site quality, growth was significantly greater in full shrub removal plots for stand densities < 2000 trees ha-1. After 26-36 years, stand volumes were 25-67 m3 ha-1 (11-38%) greater at Challenge, 30-33 m3 ha-1 (25-52%) greater at Pringle Falls, and 27-41 m3 ha-1 (115-326%) greater at Trough Springs Ridge when shrubs were removed. Periodic volume growth declined substantially during the last ten years at Challenge and Pringle Falls, regardless of treatment, due to confounding effects of mortality, drought, inter-tree competition, and insect defoliation. Further, the importance of shrub control on growth increment was not evident during the last 10 years at both sites as tree-shrub competition likely switched to tree-tree competition. On the low quality site, shrub control is critical for stand development.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationZhang, Jianwei; Oliver, William W.; Busse, Matt D. 2006. Growth and development of ponderosa pine on sites of contrasting productivities: relative importance of stand density and shrub competition effects. Canadian Journal of Forest Research 36:2426-2438.
KeywordsUnderstory vegetation control, stand dynamics, density
- High yields from young-growth ponderosa pine.
- Spacing and shrub competition influence 20-year development of planted ponderosa pine
- Stand structure in eastside old-growth ponderosa pine forests of Oregon and northern California.
XML: View XML