Growth response analysis after early control of woody competition for 14 loblolly pine plantations in the southern U.S.Author(s): David B. South; James H. Miller
Source: Forest Ecology and Management, Vol. 242: 569-577
Publication Series: Miscellaneous Publication
PDF: View PDF (886 KB)
DescriptionOnly a few growth and yield programs allow users to model the effects of hardwood competition on yields from pine plantations. Several of these programs were developed with the assumption that reducing hardwood competition would consistently produce a Type 2 growth response where pine volume gains increase over time. However, the actual response is not always a Type 2 response. To determine growth response types resulting from woody control treatments, plot volume data were analyzed from 14 trials (on 13 sites) measured over a period of 2 decades (The COMProject). The "age-shift" method of growth analysis and regression analyses were used to classify the types of responses. After 20 years, stand volumes of loblolly pine (Pinus taeda L.) were increased after woody control at 13 of 14 trials when compared to no controls. At four trial locations the age gain ranged from 0.7 to 1.6 years and the growth response was classified as a pseudo-Type 1 response (i.e., pine growth was increased while the total above-ground biomass of the mixed-stand was not altered by the species shift). At nine trial locations a true Type 2 response was observed (i.e., increase in total above-ground biomass of the pine dominated mixed-stand) and the age gain ranged from 0.9 to 5.1 years. At a site in Louisiana, woody control on two similar blocks resulted in a reduction in both early and mid-rotation pine volumes (termed a Type E response) while two other blocks resulted in an early reduction that changed to a mid-rotation volume increase (termed a Type F response). Thus, four types of growth response were associated with woody control treatments.
- 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.
CitationSouth, David B.; Miller, James H. 2007. Growth response analysis after early control of woody competition for 14 loblolly pine plantations in the southern U.S. Forest Ecology and Management, Vol. 242: 569-577
KeywordsPinus taeda, weed control, hardwoods, herbicides, age-shift
Multidecadal response of naturally regenerated southern pine to early competition control and commercial thinning
- Pine straw harvesting, fire, and fertilization affect understory vegetation within a Louisiana longleaf pine stand
- Growth and Yield Relative to Competition for Loblolly Pine Plantations to Midrotation- A Southeastern United States Regional Study
XML: View XML