1979 年 29 巻 4 号 p. 323-335
OOHATA Sei-ichi (Kyoto Univ. For. Agr., Kyoto Univ., Kyoto) & SHINOZAKI Kichiro (Sci. Educ. Inst. Sakai City, Sakai). 1979. A statical model of plant form-Further analysis of the Pipe Model Theory. Jap. J. Ecol., 29 : 323-335. In the present study, the structure of stems in plant communities was analyzed as an extension of the Pipe Model Theory proposed by SHINOZAKI et al. (1964). A close correlation was found between the amount of non-photosynthetic tissue [C (z)] at the stratum z and the cumulative amount of plant weight [T (z)] from the top to that stratum. The relation between T (z) and C (z) is always linear, at least in the leafless range (trunk) in plant communities. A characteristic constant of this linear relation is herein referred to as the Specific Stress Length (SSL). This linear relation implies that the amount of nonphotosynthetic tissue increases exponentially downward. This trunk form may be physically interpreted in terms of a compressive stress distribution that is constant regardless of elevation. Statically, this form may be ideally suited for the purpose of supporting the plant body. Among the plant communities investigated, the values of SSL were always proportional to the community height. This statical model of woody tissue may be construed as a consequence of the pattern of accumulation of disused pipes that was proposed by SHINOZAKI et al. (1964).