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一般講演(ポスター発表) P1-074

Crown structure dynamics of Kandelia obovata stands in Manko Wetland, Okinawa Island

*Kangkuso Analuddin, Rempei Suwa and Akio Hagihara (Univ. of The Ryukyus)

Crown structure dynamics of Kandelia obovata (S., L.) Yong stands were investigated over four years. Tree height H, height at the lowest living leaves HL and stem diameter at H/10 D0.1H were measured. Tree crown parameters, such as crown length CL and crown width CW, were also measured. Height at the lowest living leaves HL increased significantly, so that crown length CL decreased as stands grew. It suggests that crown changes to be dumpy as stands grow. Crown width CW increased and then decreased as stands grew, which means that crown width attains its maximum size and then decreases just after the canopy closes. The CL/CW ratio decreased as stands grew, which indicates that the crown shape changes from a thick type to a thin type with stands grow. It may imply that trees transform their crown shape for reducing the stress of competition. The year when crown width CW becomes maximum decreased from the riverside landward, which indicates that trees near the riverside later attain the year as compared with trees near the landward.

日本生態学会