Removing Biological Trends From Tree-Ring Series: Testing Modified Hugershoff Curves
AffiliationMOE Key Laboratory of Western China’s Environmental Systems, Lanzhou University
Tree-Ring Lab, Lamont-Doherty Earth Observatory of Columbia University
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CitationFang, K., Guo, X., Peters, K., Li, J., Zhang, F., 2010. Removing the biological trends from tree-ring series: Testing modified Hugershoff curves. Tree-Ring Research 66(1):51-59.
AbstractThe performance of the Hugershoff curve on fitting the growth trends of tree-ring series was tested using ring-width series with different starting years. The fitted values tend to be biased by tree-ring series close to pith, a phenomenon that was referred to as the ‘‘start-fitting problem’’. We determined three parameters with specific biological age-related meanings for the Hugershoff growth curve, i.e. the maximum growth, the maximum slope and the maximum changing ratio of slopes. A set of modified Hugershoff curves with different starting years was proposed to mitigate the start-fitting problem. Behavior of the modified Hugershoff curves on tree-ring series standardizations was tested and discussed. The ‘‘end-fitting problem’’ suggests that deviations in one interval could bias the fitted values of other time periods by using the Hugershoff curve.