Capturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shape

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dc.contributor.authorShi, Pei-Jianen_ZA
dc.contributor.authorHuang, Jian-Guoen_ZA
dc.contributor.authorHui, Cangen_ZA
dc.contributor.authorGrissino-Mayer, Henri D.en_ZA
dc.contributor.authorTardif, Jacques C.en_ZA
dc.contributor.authorZhai, Li-Hongen_ZA
dc.contributor.authorWang, Fu-Shengen_ZA
dc.contributor.authorLi, Bai-Lianen_ZA
dc.date.accessioned2016-11-15T10:25:20Z
dc.date.available2016-11-15T10:25:20Z
dc.date.issued2015
dc.descriptionCITATION: Shi, P. J., et al. 2015. Capturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shape. Frontiers in Plant Science, 6:856, doi:10.3389/fpls.2015.00856.
dc.descriptionThe original publication is available at www.frontiersin.org
dc.description.abstractTree-rings are often assumed to approximate a circular shape when estimating forest productivity and carbon dynamics. However, tree rings are rarely, if ever, circular, thereby possibly resulting in under- or over-estimation in forest productivity and carbon sequestration. Given the crucial role played by tree ring data in assessing forest productivity and carbon storage within a context of global change, it is particularly important that mathematical models adequately render cross-sectional area increment derived from tree rings. We modeled the geometric shape of tree rings using the superellipse equation and checked its validation based on the theoretical simulation and six actual cross sections collected from three conifers. We found that the superellipse better describes the geometric shape of tree rings than the circle commonly used. We showed that a spiral growth trend exists on the radial section over time, which might be closely related to spiral grain along the longitudinal axis. The superellipse generally had higher accuracy than the circle in predicting the basal area increment, resulting in an improved estimate for the basal area. The superellipse may allow better assessing forest productivity and carbon storage in terrestrial forest ecosystems.en_ZA
dc.description.urihttp://journal.frontiersin.org/article/10.3389/fpls.2015.00856/full
dc.description.versionPublisher's version
dc.format.extent13 pages
dc.identifier.citationShi, P. J., et al. 2015. Capturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shape. Frontiers in Plant Science, 6:856, doi:10.3389/fpls.2015.00856
dc.identifier.issn1664-462X (online)
dc.identifier.otherdoi:10.3389/fpls.2015.00856
dc.identifier.urihttp://hdl.handle.net/10019.1/99856
dc.language.isoen_ZAen_ZA
dc.publisherFrontiers Media
dc.rights.holderAuthors retain copyright
dc.subjectConifers -- Basal area -- Measurementen_ZA
dc.subjectConifers -- Age determination -- Mathematicsen_ZA
dc.subjectSuperellipseen_ZA
dc.subjectDendrochronologyen_ZA
dc.subjectForest productivity -- Measurementen_ZA
dc.subjectCarbon -- Storage -- Mathematicsen_ZA
dc.titleCapturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shapeen_ZA
dc.typeArticleen_ZA
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