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dc.contributor.authorShi, P.J.
dc.contributor.authorHuang, J.G.
dc.contributor.authorHui, C.
dc.contributor.authorGrissino-Mayer, H.D.
dc.contributor.authorTardif, J.C.
dc.contributor.authorZhai, L.H.
dc.contributor.authorWang, F.S.
dc.contributor.authorLi, B.L.
dc.date.accessioned2016-02-29T10:01:41Z
dc.date.available2016-02-29T10:01:41Z
dc.date.issued2015-10-15
dc.identifier.citationShi, P.J., Huang, J.G., Hui, C., Grissino-Mayer, H.D., Tardif, J.C., Zhai, L.H., Wang, F.S. & Li, B.L. (2015) Capturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shape. Frontiers in Plant Science, 6: 856.en
dc.identifier.issn1664-462Xen
dc.identifier.urihttp://hdl.handle.net/123456789/1964
dc.description.abstractTree-rings are often assumed to approximate a circular shape when estimating forest productivity and carbondynamics. However, treerings 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 super ellipse may allow better assessing forest productivity and carbon storage in terrestrial forest ecosystems.en
dc.description.sponsorship0en
dc.format.extent6559250 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherOnline Articlesen
dc.subjectbasal areaen
dc.subjectcross sectionen
dc.subjectmajor semi-axisen
dc.subjectpolar coordinateen
dc.subjectrotatioinen
dc.subjecttree-ringsen
dc.titleCapturing spiral radial growth of conifers using the superellipse to model tree-ring geometric shapeen
dc.typeJournalArticlesen
dc.cibjournalFrontiers in Plant Scienceen
dc.cibprojectSpatial concordance in diversity and its temporal changeen


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