| 要旨トップ | 目次 | | 日本生態学会第59回全国大会 (2012年3月,大津) 講演要旨 ESJ59/EAFES5 Abstract |
一般講演(ポスター発表) P2-056J (Poster presentation)
Applying Weller’s allometric model for partial organs, the self-thinning exponent αx in overcrowded Bruguiera gymnorrhiza stands were examined. The self-thinning exponent αx (=1/{1-(δx+θx)}) was estimated to be 1.52, 1.51, 1.09 and 1.45 in stem, branch, leaf and aboveground, respectively. The ρ-w relationship, where population density ρ is a response variable and mass w is an explanatory variable gives the αx calculated from 1/ϕx, which is mathematically and statistically (in terms of OLS) equivalent to 1/{1-(δx+θx)}. The ϕx-values of 0.6582, 0.6601, 0.9129 and 0.6748, which are the same as the reciprocal of 1.52, 1.51, 1.09 and 1.48 in stem, branch, leaf and aboveground, respectively. The ϕx-value was not significantly different from 2/3, but significantly different from 3/4 in stem, branch and aboveground. This means that the αx of woody parts were not significantly different from 3/2. The ϕL-value of leaf was significantly different from 2/3 and 3/4, but was insignificantly different from 1.0. These means that the stand leaf biomass is constant regardless of ρ. Therefore, the present results based on the allometric model of partial organs in the overcrowded B. gymnorrhiza stands strengthened the justification of the simple geometric model rather than the metabolic model.