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1 January 2010 Removing Biological Trends from Tree-Ring Series: Testing Modified Hugershoff Curves
Keyan Fang, Xiaohua Gou, Kenneth Peters, Jinbao Li, Fen Zhang
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Abstract

The 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.

Keyan Fang, Xiaohua Gou, Kenneth Peters, Jinbao Li, and Fen Zhang "Removing Biological Trends from Tree-Ring Series: Testing Modified Hugershoff Curves," Tree-Ring Research 66(1), 51-59, (1 January 2010). https://doi.org/10.3959/2008-18.1
Received: 28 October 2008; Accepted: 27 September 2009; Published: 1 January 2010
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