| 要旨トップ | 目次 | 日本生態学会第60回全国大会 (2013年3月,静岡) 講演要旨
ESJ60 Abstract


一般講演(ポスター発表) P1-020 (Poster presentation)

Self-thinning exponents of partial organs and aboveground mass of mangrove Kandelia obovata stands.

*M. Kamara, M. Kamruzzaman, R. Deshar, S. Sharma, A. Hagihara (Univ. of the Ryukyus)

Using Weller’s allometric model, the self-thinning exponent αx of a partial organ x in overcrowded Kandelia obovata stands in Okinawa, Japan, was studied over eight years. The self-thinning exponent αx was calculated on the basis of the coefficients θx and δx obtained from the allometric relationships of mean tree height H(=gθX.wθX) and mean organ mass density d(=gδX.wδx) to mean organ mass wX. The self-thinning exponent αx was estimated to be 1.40 for stem, 1.53 for branch, 1.01 for leaf, and 1.40 for aboveground. The φx-value (φX=1-(θXX)) was not significantly different from 2/3 for stem, branch, and aboveground, i.e., αx=3/2. Thus the self-thinning exponents for stem, branch and aboveground are not different from 3/2. On the other hand, the φx-value was also not significantly different from 3/4 for stem and aboveground, i.e., αx=4/3. Therefore, the self-thinning exponent for stem and aboveground is not significantly different from 4/3. The φL-value for leaf was not significantly different from 1.0. The self-thinning exponents of partial organs except leaf and branch of K. obovata followed both the geometric and the metabolic model.


日本生態学会