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Stem taper functions for Betula platyphylla in the Daxing'an Mountains, northeast China

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dc.contributor.authorShahzad, Muhammad Khurramen
dc.contributor.authorHussain, Amnaen
dc.contributor.authorBurkhart, Harold E.en
dc.contributor.authorLi, Fengrien
dc.contributor.authorJiang, Lichunen
dc.contributor.departmentForest Resources and Environmental Conservationen
dc.date.accessioned2020-12-23T20:06:36Zen
dc.date.available2020-12-23T20:06:36Zen
dc.date.issued2020-05-19en
dc.description.abstractAccurate prediction of stem diameter is an important prerequisite of forest management. In this study, an appropriate stem taper function was developed for upper stem diameter estimation of white birch (Betula platyphylla Sukaczev) in ten sub-regions of the Daxing'an Mountains, northeast China. Three commonly used taper functions were assessed using a diameter and height dataset comprising 1344 trees. A first-order continuous-time error structure accounted for the inherent autocorrelation. The segmented model of Max and Burkhart (For Sci 22:283-289, 1976. 10.1093/forestscience/22.3.283) and the variable exponent taper function of Kozak (For Chron 80:507-515, 2004. 10.5558/tfc80507-4) described the data accurately. Owing to its lower multicollinearity, the Max and Burkhart (1976) model is recommended for diameter estimation at specific heights along the stem for the ten sub-regions. After comparison, the Max and Burkhart (1976) model was refitted using nonlinear mixed-effects techniques. Mixed-effects models would be used only when additional upper stem diameter measurements are available for calibration. Differences in region-specific taper functions were indicated by the method of the non-linear extra sum of squares. Therefore, the particular taper function should be adjusted accordingly for each sub-region in the Daxing'an Mountains.en
dc.description.notesThis study was financially supported by the National Natural Science Foundation of China (31570624), Applied Technology Research and Development Plan Project of Heilongjiang Province (GA19C006), and Fundamental Research Funds for Central Universities (2572019CP15).en
dc.description.sponsorshipNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31570624]; Applied Technology Research and Development Plan Project of Heilongjiang Province [GA19C006]; Fundamental Research Funds for Central UniversitiesFundamental Research Funds for the Central Universities [2572019CP15]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1007/s11676-020-01152-4en
dc.identifier.eissn1993-0607en
dc.identifier.issn1007-662Xen
dc.identifier.urihttp://hdl.handle.net/10919/101625en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectWhite birchen
dc.subjectTaper functionen
dc.subjectMulticollinearityen
dc.subjectAutocorrelationen
dc.subjectNonlinear regressionen
dc.titleStem taper functions for Betula platyphylla in the Daxing'an Mountains, northeast Chinaen
dc.title.serialJournal of Forestry Researchen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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