ESJ58 一般講演（ポスタ-発表） P3-056

Seasonal litterfall production in mangrove Kandelia obovata stands on Okinawa Island over five years

*Sharma, S. （Univ. of the Ryukyus）, Hoque, ATMR. （Chittagong Univ., Bangladesh）, Analuddin, K. （Haluoleo Univ., Indonesia）, Hagihara, A. （Univ. of the Ryukyus）

A belt-transect (5 m ? 125 m) was established and litterfall collected monthly over five years from April 2005 to March 2010 in Manko Wetland, Okinawa Island. The seasonal trends of litterfalls were not different among the years. Branch litterfall showed an exponential relation with the monthly maximum wind speed. The autocorrelation coefficient showed a clear one year cycle for all litterfalls, except for the branch litterfall. The stipule litterfall, i.e. an indicator of new leaf flush, positively correlated to the leaf litterfall, which suggests that the leaf litterfall followed the production of new leaves. The stipule litterfall decreased up to a minimum value with an increase of flower, fruit and propagule litterfalls. This result indicates that the new leaf flush can decrease with increasing flower, fruit and propagule production. Mean annual total litterfalls of the 1^st year, the 2^nd year, the 3^rd year, the 4^th year and the 5^th year were respectively estimated as 891.1 + 0.3, 1037.3 + 0.5, 1162.0 + 0.9, 902.4 + 0.9 and 912.5 + 12.6 (SE) g m^-2 yr^-1. Leaf litterfall per plot was close to be constant regardless of the tree density of plot.