| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1987: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥600,000 (Direct Cost: ¥600,000)
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| Research Abstract |
This study "Dynamics of mangal and biological study of mangroves" are summarized as follows. 1. Growth of seedlinds of mangroves: The growth of the planted seedlings of Kandelia candel, Rhizophora stylosa and Bruguiera gymnorrhiza were investigated at the mud flat of the Shiira River, Iriomote-jima. The rates of shoot elongation of the three species reached to the peak in summer. The survival rates of seedlings 18 months after planting were as follows: in the Rhizophora was 90%, Bruguiera 72% and Kandelia 57%, respectively. In the inner parts of mangal, however, all propagules of the species were disappeared in 8 months after planting. In comparison with the survival or growth rates of the seedlings at open mud flat and the seedlings at the forest margin where pneumatophores of Soneratia and Avicenia have been developed, both rates of the Kandelia candel and Rhizophora stylosa wereapparently high at the zone of the open mud flat, while the rates of the Bruguiera gymnorrhiza were slightly high at the forest margin. The elongation rate and survival rate of seedlings of the former two species seemed to be correlated with condition of substratum. In the planting zone of open mud flat, some of young shoot apices of Bruguiera gymnorrhiza were broken off as a result of the strong wind attackes in winter. It was suggested that the significant ecological factors for growth of the seedlings are not only light condition and nature of substratum but also seasonal wind in the subtropical regions.
Others, 2. Standing crop and growth form of mangroves at eary growth stage, 3. Thickning growth of mangrowves, and 4. Observation of mangrove dead zone at the Nakama River, Iriomote-Jimawere were studied.
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