Skip to Main Content
Physiological girdling of pine trees via phloem chilling: proof of conceptAuthor(s): Kurt Johnsen; Chris Maier; Felipe Sanchez; Peter Anderson; John Butnor; Richard Waring; Sune Linder
Source: Plant, Cell and Environment, Vol. 30: 128-134
Publication Series: Miscellaneous Publication
PDF: Download Publication (339 KB)
DescriptionQuantifying below-ground carbon (C) allocation is particularly difficult as methods usually disturb the root– mycorrhizal–soil continuum. We reduced C allocation below ground of loblolly pine trees by: (1) physically girdling trees and (2) physiologically girdling pine trees by chilling the phloem. Chilling reduced cambium temperatures by approximately 18 °C. Both methods rapidly reduced soil CO2 efflux, and after approximately 10 days decreased net photosynthesis (Pn), the latter indicating feedback inhibition. Chilling decreased soil-soluble C, indicating that decreased soil CO2 efflux may have been mediated by a decrease in root C exudation that was rapidly respired by microbes. These effects were only observed in late summer/early autumn when above-ground growth was minimal, and not in the spring when above-ground growth was rapid. All of the effects were rapidly reversed when chilling was ceased. In fertilized plots, both chilling and physical girdling methods reduced soil CO2 efflux by approximately 8%. Physical girdling reduced soil CO2 efflux by 26% in non-fertilized plots. This work demonstrates that phloem chilling provides a non-destructive alternative to reducing the movement of recent photosynthate below the point of chilling to estimate C allocation below ground on large trees.
- You may send email to firstname.lastname@example.org 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.
CitationJohnsen, Kurt; Maier, Chris; Sanchez, Felipe; Anderson, Peter; Butnor, John; Waring, Richard; Linder, Sune. 2007. Physiological girdling of pine trees via phloem chilling: proof of concept. Plant, Cell and Environment, Vol. 30: 128-134
Keywordsallocation, below ground, carbon, chilling, feedback inhibition, non-destructive, respiration, root exudation, soluble c.
- Fertilization Increases Below-Ground Carbon Sequestration of Loblolly Pine Plantations
- Influence of repeated canopy scorching on soil CO2 efflux
- Effects of fertilization on CO2 efflux in a two-year-old loblolly pine stand on the Virginia Piedmont
XML: View XML