A novel approach to selecting a competition index: the effect of competition on individual-tree diameter growth of Calabrian pine

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dc.authorid0000-0001-7041-1479en_US
dc.contributor.authorKahriman, Aydin
dc.contributor.authorSahin, Abdurrahman
dc.contributor.authorSönmez, Turan
dc.contributor.authorYavuz, Mehmet
dc.date.accessioned2021-03-20T20:13:02Z
dc.date.available2021-03-20T20:13:02Z
dc.date.issued2018
dc.departmentBTÜ, Orman Fakültesi, Orman Mühendisliği Bölümüen_US
dc.description.abstractIn this study, we evaluated the performance of 18 competition indices composed of nine distance-dependent and nine distance-independent indices in explaining the variation in individual-tree diameter growth of Calabrian pine (Pinus brutia Ten.) in the central Mediterranean region of Turkey. The data were obtained from 432 sample plots with varying stand age, site index, and stand density. To evaluate the performance of each competition index, the mean square error reduction approach was used relative to the noncompetition. Also, this study compared fixed and mixed effects models to analyze diameter growth. Statistical analyses showed that the best distance-independent competition indices performed as well as the best distance-dependent competition indices. The distance-independent competition index of Schroder and Gadow (1999; Can. J. For. Res. 29(2): 280-283, doi:10.1139/x98-199) performed best and is recommended for use in future growth and yield models to be used in the central Mediterranean region of Turkey. Also, the best selection of competitive neighbors was achieved using the area of influence overlap method, whereas the fixed-radius and angle count sampling methods had no significant improvement in quantifying the competition effects. On the other hand, all mixed effects models provided much better fits than their fixed model counterparts.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TOVAG-112O808]en_US
dc.description.sponsorshipThis study was carried out as part of a project financed by the Scientific and Technological Research Council of Turkey (TUBITAK) (Project No. TOVAG-112O808). The authors thank Professor Klaus von Gadow (Georg-August Universitat Gottingen, Gottingen, Germany; Stellenbosch University, Matieland, South Africa) for his constructive comments and suggestions. The authors also thank the other researchers in this project and employees of Antalya and Mersin Regional Forest Directorates who contributed to this project. The authors declare that they have no conflict of interest.en_US
dc.identifier.doi10.1139/cjfr-2018-0092en_US
dc.identifier.endpage1226en_US
dc.identifier.issn0045-5067
dc.identifier.issn1208-6037
dc.identifier.issue10en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage1217en_US
dc.identifier.urihttp://doi.org/10.1139/cjfr-2018-0092
dc.identifier.urihttps://hdl.handle.net/20.500.12885/771
dc.identifier.volume48en_US
dc.identifier.wosWOS:000445502700010en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorSönmez, Turan
dc.language.isoenen_US
dc.publisherCanadian Science Publishing, Nrc Research Pressen_US
dc.relation.ispartofCanadian Journal Of Forest Researchen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectdiameter growthen_US
dc.subjectcompetition indicesen_US
dc.subjectselection of competitoren_US
dc.subjectfixed and mixed modelsen_US
dc.subjectCalabrian pineen_US
dc.titleA novel approach to selecting a competition index: the effect of competition on individual-tree diameter growth of Calabrian pineen_US
dc.typeArticleen_US

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