Provider: ingentaconnect
Database: ingentaconnect
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TY - ABST
AU - Zeide, Boris
TI - Analysis of the 3/2 Power Law of Self-Thinning
JO - Forest Science
PY - 1987-06-01T00:00:00///
VL - 33
IS - 2
SP - 517
EP - 537
KW - Reineke's equation
KW - Allometric regression
KW - crown closure
KW - stand dynamics
KW - tree morphology
KW - gap dynamics
N2 - The 3/2 power law states that the relative rate of self-thinning with respect to biomass growth per unit area is a universal constant equal to two. The law could be true in two cases: (1) when all factors of stand dynamics unaccounted for by the law (in particular, change in plant form and change in crown closure) are nonexistent; and (2) when the effects of the unaccounted factors on the rate of self-thinning cancel each other. As the presented reasons and evidence show, the major neglected factors indeed oppositely affect the rate of self-thinning. In general, however, these factors rarely balance each other, and the rate predictably changes with age, species, site quality, and other factors. The limiting line of self-thinning does not have any constant slope (on the log-log scale); generally, this line is a curve. A realistic model of self-thinning should be more inclusive than the law and particularly reflect the change in crown closure, or gap dynamics. An analysis of the law suggests the use of tree size as a predictor of their number; the utilization of the fact that diameter is better correlated with crown width and tree number than tree mass; and the development of a more adequate form of expressing allometric relationships than the elementary power function. For. Sci. 33(2):517-537.
UR - http://www.ingentaconnect.com/content/saf/fs/1987/00000033/00000002/art00024
ER -