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Neighbor and Height Effects on Crown Properties Associated with the Uniform-Stress Principle of Stem Formation

School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
Forests 2018, 9(6), 334; https://doi.org/10.3390/f9060334
Received: 13 May 2018 / Revised: 1 June 2018 / Accepted: 6 June 2018 / Published: 7 June 2018
(This article belongs to the Special Issue Defining, Quantifying, Observing and Modeling Forest Canopy Traits)
According to the uniform-stress principle of stem formation, the amount of leaf area a tree carries and the leverage it exerts on the stem determine the stem dimensions. Within an even-aged monoculture, the leaf area per tree and the leverage placed on the stem are functions of tree density and tree height. The uniform-stress principle presents the means to translate density effects on crown characteristics into stem dimensions and total standing volume. This approach is truly a top-down method of simulating growth tree and stand growth because leaf area and other crown properties must be determined before stem size and taper can be calculated. Each crown property influences either the sail area or the leverage placed on the stem, but the degree to which a specific crown property affects these parameters changes with stand density and height. Leverage is the more complicated of the two variables, being a function of the height to the base of the live crown and the vertical distribution of leaf area. The purpose of this brief review is to summarize the effects of stand density on the height to the base of the live tree and the vertical distribution of leaf area and the various ways these variables have been quantified. View Full-Text
Keywords: uniform-stress principles live-crown length; live-crown ratio; leaf area; biomechanics; leverage; stem taper uniform-stress principles live-crown length; live-crown ratio; leaf area; biomechanics; leverage; stem taper
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Dean, T.J. Neighbor and Height Effects on Crown Properties Associated with the Uniform-Stress Principle of Stem Formation. Forests 2018, 9, 334.

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