Abstract
Self-thinning of forest stands is one of the clearest and best-documented examples of natural selection. Besides their theoretical interest, understanding of self-thinning is important for forest practice because it produces estimates of stand density and stocking. There is a considerable diversity of views on the processes causing self-thinning, predicting variables, and analytical form of models. The most popular model was proposed by Reineke (J Agric Res 46(7):627–638, 1933) over 70 years ago. This study compares existing models of self-thinning and provides evidence that the virtually unknown model developed by Artur Nilson describes self-thinning more realistically than Reineke’s. While in the Reineke model the rate of mortality (the slope of self-thinning line) is assumed to be constant, it changes from 0 to −2 in Nilson’s model. As a result, Nilson’s model is slightly but consistently more accurate than Reineke’s. Although both models are empirical, their analysis suggests several general conclusions about self-thinning.
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The author thanks Mike Olson, Curtis VanderSchaaf, and two anonymous referees for their valuable comments.
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Communicated by T. Fourcaud.
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Zeide, B. Comparison of self-thinning models: an exercise in reasoning. Trees 24, 1117–1126 (2010). https://doi.org/10.1007/s00468-010-0484-z
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DOI: https://doi.org/10.1007/s00468-010-0484-z