Abstract
Allometry, in its broader sense, is concerned with the size of organisms and its consequences for their shape and functioning. Since the postulation of the allometric equation in the 1930s, allometry, in a narrow sense, refers to analysis and modelling of logarithmic transformed bivariate size data by linear regression techniques.
This chapter first points out that allometric research built up a valuable set of hypotheses and biometrical methods for analysing size of organisms and its consequences for their shape and functioning. Then, a summary of the knowledge about allometry of woody plants and populations will unmask the search for overarching general allometric exponents of shape and form development largely as a hunt for a phantom. Tree size development and self-thinning processes in forest stands give evidence that allometric exponents certainly lie in a narrow corridor, but are species specific and superimposed by site conditions, mechanical disturbances, competition, and other types of stress. The discussion states that as long as allometry searches for universal constants to a certain extent, it stills our innate desire to reduce complexity and generalise. However, time is ready to focus on and understand the differences between the species, sites etc. in order to contribute to a better system of understanding. It is concluded that allometry has to draw attention both to the internal size-driven allometric partitioning process and to the external factors, which determine optimal biomass allocation. And at best, allometric research should analyse both factors in order to understand and integrate them. A systematic analysis, ordering and causal explanation of allometric exponents, which reflects an individuals’ tricks and traits of optimising fitness, may provide an important link between plant genetics, physiology, plant biology and population biology. In contrast, application of inaccurate and imprecise general scaling rules can cause considerable flaws in modelling, prognosis and ecosystem management.
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Acknowledgements
The author thanks the Deutsche Forschungsgemenischaft for providing funds for the Transregional Collaborative Research Centre 38 (SFB/TR 38) “Structure and process of the initial ecosystem development phase in an artificial water catchment” and the Bavarian state Ministry for Agriculture and Forestry for permanent support of the forest yield science project W 07. “Long-term experimental plots for growth and yield research”. Thanks are also due to Tobias Mette for constructive review of the text, Ulrich Kern for the graphical artwork, and anonymous reviewers, for their helpful comments.
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Pretzsch, H. (2010). Re-Evaluation of Allometry: State-of-the-Art and Perspective Regarding Individuals and Stands of Woody Plants. In: Lüttge, U., Beyschlag, W., Büdel, B., Francis, D. (eds) Progress in Botany 71. Progress in Botany, vol 71. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02167-1_13
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