KITADA Hideo KINKI UNIV., DEPT.OF FISHRIES, LECTURE, 農学部, 講師 (50088192)
EGUCHI Mituru KINKI UNIV., DEPT.OF FISHERIES, ASSO.PROFESSOR, 農学部, 助教授 (40176764)
OKINAKA Motoo KINKI UNIV., CIVIL ENGINEERING, LECTURE (90298985)
|Budget Amount *help
¥2,900,000 (Direct Cost : ¥2,900,000)
Fiscal Year 2000 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1999 : ¥900,000 (Direct Cost : ¥900,000)
Fiscal Year 1998 : ¥1,200,000 (Direct Cost : ¥1,200,000)
The purpose of this study was to develop the method for the early recovery of the biodiversity in the oligotrophical coastal area. It is important in the recovery of the biodiversity to make kelp forest grow in the concerned area. In order for it, sufficient nutrient is required as weii as the proper seedbed. Hence, in this study, granulated fertilizer, which contains nutrient, such as nitrogen, phosphorus and iron, is coated by the special polymer, and then, is mixed into the porous concrete in order to provide seedbed and nutrent simultaneously. The physical and chemical properties, such as voids ratio, water permeability, compressive strength and elution of nutrient from test specimens of porous concrete with granulated fertilizer are discussed.
When this type of concrete is immersed shallowly into seawater, not only its rough surface, but also its continuous interior voids are fully exposed to water and rapidly neutralized. This will them lead to the attachment and growth of marine microbes and eventually to the formation of a layer of biotic membranes. As the results, decomposition and mineralization of the marine organic matters and the growth of algae attached. Especially, attachment of large algae and many kinds of animal are accelerated, thereby providing the water area with a better biological environments. Then brief note is appended to describe the method to create the biodiversity in sea area.