Relationship between distribution of mangrove species and natural condition of secondary forest and abandoned fishpond and logged over area in Lamon Bay, the Philippines

DOI Web Site 23 References
  • Toyoda Takaki
    The United School of Agriculture Science, Tokyo University of agriculture and technology:(Present office)Japan overseas forestry consultants association
  • Mabesa Ruben C.
    Department of environment & natural resources, Community environment and natural resources office
  • Taniguchi Toshihiko
    Faculty of Agriculture, Tokyo University of agriculture and technology:(Present office)MontBell Co., Ltd.
  • Toda Hiroto
    Institute of Symbiotic Science and Technology, Graduate School of Tokyo University of agriculture and technology
  • Haibara Kikuo
    Institute of Symbiotic Science and Technology, Graduate School of Tokyo University of agriculture and technology

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Other Title
  • フィリピンラモン湾のマングローブ二次林および養殖放棄地の植生と立地の関係
  • フィリピン ラモンワン ノ マングローブ 2ジリン オヨビ ヨウショク ホウキチ ノ ショクセイ ト リッチ ノ カンケイ

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Abstract

The comparative examination of the distribution of mangrove vegetation, submergence situation, total Na concentration of soil, salinity and oxygen reduction potential of surface water were conducted in secondary mangrove forests (BT1) and abandoned fishponds (BT2), located in Lagay village of Lamon Bay in Luzon Island, Philippines. From relationship between appearance of mangrove tree species and submergence days, eligible distribution ranges for growth were clarified which were indicated by submergence and non-submergence days. Submergence/non-submergence days of Rhizophora apiculata (Ra) is 24-21 days/3-4 days per month, Ceriops tagal (Ct) is 22-17 days/4-7 days, Lumnitzera littorea・Scyphiphora hydrophyllacea (Ll・Sh) is 21-13 days/5-9 days, Avicennia officinalis (Ao) is 13-9 days/9-16 days, Heritiera littoralis・Intsia retusa etc. (Hl・Ir) is 9-0 days/16-30 days. In the abandoned fishponds, mangrove vegetation was not observed. The submergence/non-submergence days of abandoned fishponds is 30 days/0 days per month, it was recognized that mangrove vegetation could not easily recover naturally in such place. Distribution range of mangrove tree species in the secondary mangrove forest is influenced by difference of submergence/non-submergence days through the total Na concentration of soil, salinity and oxygen reduction potential of surface water. On the other hands, in the abandoned fishpond, value of total Na concentration of soil and value of oxygen reduction potential of surface water is influenced by disturbance of land condition of 20 years ago.

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