Skip to Main Content
Aboveground biomass response to release treatments in a young ponderosa pine plantationAuthor(s): Martin Ritchie; Jianwei Zhang; Ethan Hammett
Source: Forests. 10(9): 795
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (2.0 MB)
DescriptionControlling competing vegetation is vital for early plantation establishment and growth. Aboveground biomass (AGB) response to manual grubbing release from shrub competition was compared with no release control in a twelve-year-old ponderosa pine (Pinus ponderosa Lawson & C. Lawson) plantation established after a wildfire in northeastern California. In addition, response to chemical release followed by precommercial thinning in an adjacent plantation was also examined as a growth potential from a more intensively managed regime, where shrub competition was virtually eliminated. We measured AGB in both planted trees and competing woody shrubs to partition the biomass pools in the plantation. The results showed a significant grubbing treatment effect on basal diameter (BD) at 10 cm aboveground (p = 0.02), but not on tree height (p = 0.055). Height and BD were 2.0 m and 7.4 cm in the manual release, respectively, compared to 1.7 m and 5.6 cm in the control. However, chemical release produced much greater rates of tree growth with a height of 3.6 m and BD of 14.7 cm, respectively. Tree AGB was 60% higher with the manual release of shrubs (1.2 Mg ha−1) than with control (0.7 Mg ha−1) (p < 0.05) . When woody shrub biomass was included, the total AGB (trees and woody shrubs) appeared slightly higher, but non-significant in the no release control (13.3 Mg ha−1) than in the manual release (11.9 Mg ha−1) (p = 0.66); the chemical release had 17.1 Mg ha−1. Clearly, shrub biomass dominated this young plantation when understory shrubs were not completely controlled. Although the manual release did increase targeted tree growth to some degree, the cost may limit this practice to a smaller scale and the remaining shrub dominance may create long-term reductions in growth and a persistent fuels problem in these fire-prone ecosystems.
- 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.
CitationRitchie, Martin; Zhang, Jianwei; Hammett, Ethan. 2019. Aboveground biomass response to release treatments in a young ponderosa pine plantation. Forests. 10(9): 795. https://doi.org/10.3390/f10090795.
Keywordschemical release, manual release, shrub biomass
- Development of a mixed shrub–ponderosa pine community in a natural and treated condition
- Ponderosa pine seedlings and competing vegetation: ecology, growth, and cost
- Timing and duration of release affect vegetation development in a young ponderosa pine plantation
XML: View XML