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Research Letters in Ecology
Volume 2007, Article ID 54762, 4 pages
Research Letter

A Consideration of the Constancy of Biomass Density in Plant Populations Undergoing Self-Thinning

Laboratory of Forest Ecology and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

Received 23 August 2007; Accepted 21 November 2007

Academic Editor: Madhur Anand

Copyright © 2007 Kazuharu Ogawa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The constancy of biomass density was considered in an entire plant population p by combining two adjacent populations p1 and p2 for which the self-thinning rule is assumed to be satisfied independently and each biomass density is also assumed to be the same constant value. Under these assumptions, the biomass density d in a population p was formulated as d=c((kmα+1)(km+1)/(km1α+1)(k+1)), where c is biomass density of p1 and p2, and k and m are stand area and density ratio of p1 to p2, respectively, and α is the self-thinning slope. In the case of m1, the value of d in the above equation is always larger than unity. This fact indicates that the biomass density in a combined population p is not equal to the biomass density c in each population p1 or p2 because of systematic error.