Evaluation of Restoration Effect in the Coastal Unused Reclaimed Area by Promoting Water Exchange in Ago Bay.

Abstract

In AGO Bay, approximately 70% of the tidal flat have already been lost because of land reclamation. In this study, attempts were made to enhance the biological productivity, by promoting water exchange between unused reclaimed area and outer sea using pumps, pipeline system was set up in an experimental reclaimed wetland. Improvements were evaluated by monitoring sediment quality, benthic abundance every season for 18 months. The sediment statuses in wetland were gradually changed to the aerobic condition by promoting the decomposition of the hypertrophic sediment under the water exchange. Continuous water exchange would provide enhancement of the biological productivity. This method would lead to wise use of the coastal environment and enhance the biological productivity around the unused reclaimed areas. 1.•@‚Í ‚ ¶ ‚ß ‚É "OE ‹ž˜p‹ž˜p ‚â'å •ã˜p ‚È ‚Ç‚Ì"s ŽsˆaeŽsˆae ‚̉ˆŠÝ‚̉ˆŠÝ •" ‚É ‚Í'á-˜-p 'n ‰» ‚µ ‚½ •H•ê •Õ 'n ‚ª'½ ‚-Žc ‚³‚ê,‚Ü ‚½,ˆê OE© Ž©'R-L ‚© ‚ȉp ‹ñ˜p‹ñ˜p ‚É ‚¨‚¢‚Ä‚¨‚¢‚Ä ‚à,•k •ì •ú Šü 'n"™ ‚Ì-¢-˜-p 'n ‚ð'½ ‚-•ø ‚¦‚Ä ‚¢ ‚é.‰ˆ ŠÝˆaeŠÝˆae ‚Ì ŠÂ ‹«•Ä • ¶ ‚ðŽÀ Ž{ ‚· ‚é•ê • ‡,‚± ‚Ì ‚ae ‚¤‚È-¢-˜-p 'n ‚Ì-Ê •Ï ‚Í-³ Ž‹ ‚Å ‚«‚È ‚¢‹K-Í ‚Å ‚ ‚è,"OE ‹ž˜p‹ž˜p ‚Å ‚͉ˆŠÝˆaêê‚͉ˆŠÝ‚͉ˆŠÝˆaêê 'Ñ ‚É, ‰p ‹ñ˜p‹ñ˜p ‚Å ‚ÍOE» ' ¶ ‚· ‚銱 Šƒ ‚Ì-ñ2"{ ‚Ì‹x •k "c‚ª•ú 'u ‚³ ‚ê‚Ä ‚¢ ‚é(•' •ª ‚ç2008).‚± ‚Ì ‚ae ‚¤‚ȉˆŠÝ‚¤‚ȉˆŠÝ-¢-˜-p 'n ‚Í,‰p ‹ñ˜p‹ñ˜p •ó ŠCˆaeŠCˆae ‚𕪠'f ‚µ,• ¶ •¨ • ¶ ŽY •« ‚ð'˜ ‚µ ‚-'á ‰º ‚³‚¹‚Ä ‚¢ ‚é(•' •ª ‚ç2008).‚± ‚¤ ‚µ‚½ ŽÀ •î ‚ð"w OEi ‚É,ŠCˆaeŠCˆae ‚Ì Ž©'R •Ä • ¶ Žè-@ ‚AE ‚µ‚Ä,‰ˆŠÝ‰ˆŠÝ-¢-˜-p'n ‚ðŠ± Šƒ ‚É•Ä • ¶ ‚· ‚é•\ 'z ‚ª ‹c˜_‹c˜_ ‚³ ‚ê‚Ä ‚¢ ‚é.-{ OE¤ ‹ † ‚Å ‚Í,‰ˆŠÝ‰ˆŠÝ-¢-˜-p 'n ‚Ì •Ä • ¶ ‹Z •p ŠJ "-‚Ì 'aêê •à ‚AE ‚µ‚Ä,‰ˆŠÝ‰ˆŠÝ-¢-˜-p 'n ‚Ì• ¶ •¨ • ¶ ŽY •« ‚ÌOEü •ã ‚ð •} ‚é ‚½‚ß,'ç-h ‚É ‚ae ‚è'j ŠQ ‚³ ‚ê‚Ä ‚¢‚éŠC •…-¬ "® ‚ð ƒ| ƒ"ƒv ‚É ‚ae ‚è‰ñ •oe ‚³‚¹ ‚éŠC •… "± "ü ŽÀ OE± ‚ðŽÀ Ž{ ‚µ,ŠC •… "± "ü 'O OEã ‚Ì'ê Ž¿ ‚AE'ê • ¶ • ¶ •¨ ‚Ì•Ï ‰» "Á •« ‚É‚Â ‚¢ ‚Ä•®-• ‚µ‚½.‚³ ‚ç‚ÉŽÀ OE± ƒf •[ ƒ^‚ð OE³ ‚É-¬ "® •E•… Ž¿ •E'ê Ž¿ ƒV ƒ~ƒ… ƒOE•[ ƒV ƒ ‡ƒ"‚ðŽÀ Ž{ ‚µ,ŠC •… "± "ü ‚É ‚ae ‚éŠÂ ‹«•Ä • ¶ OEø ‰Ê ‚ðOEŸ "¢ ‚µ‚½. 2.•@OE» 'n ŽÀ OE± ‚Ì •û-@ (1)•@ ŠC •… "± "ü ‚É ‚ae‚é 'ç-hOEã "w 'n ‚Ì•Ä • ¶ ŽÀ OE± OE» 'n ŽÀ OE± •ê •Š ‚AEŠC •… "± "üŽÀ OE± •} ‚ð •}-1,2‚É Ž¦ ‚·.-{ ŽÀ OE± ‚Í,2006"N5OEŽ ‚ae ‚舢 Ž™ '¬-§ •_ ŽÛ ‰Y ‚ÅŽÀ Ž{ ‚µ‚½.ŽÀ OE± •ê •Š ‚Í,‰p ‹ñ˜p‹ñ˜p ‚Ì"ü •] ‚̉oe ‚ÉˆÊ 'u ‚µ,‰ß ‹Ž ‚É ‚ÍŠ± Šƒ ‚Å ‚ ‚Á ‚½‚ª,-¾ Ž¡ Žž 'ã ‚ÉŠ± 'ñ ‚³‚ê,OE» •Ý ‚Í•k •ì •ú Šü ‚³‚ê ‚Ä ‚¢ ‚é. ŠCˆaeŠCˆae '¤ ‚̓R ƒ"ƒN ƒŠ•[ ƒg'ç-h ‚É ‚ae ‚è'÷ ‚ß•Ø ‚ç‚ê,-¤ '¤ ‚ÍŽR •X ‚ɘA '± ‚µ‚½ ƒˆƒVOE´‚AEƒˆƒVOE´ƒˆƒVOE´‚AE-× •Ú ‚µ,•… "c ‚AE ‚µ‚Ä •® "õ ‚³‚ê ‚½-¼ Žc ‚© ‚ç,ŽÀ OE± 'n ‚ÌŽüˆÍ‚ÌŽüˆÍ ‚Í ‚ ‚º"¹ ‚ÅˆÍ‚ÅˆÍ ‚Ü‚ê‚Ä ‚¢ ‚é.‚Ü ‚½,'ç-h ‚É ‚Í‹t-¬-hŽ~-p ‚Ì ƒt ƒ‰ ƒbƒv ‚ª•Ý 'u ‚³‚ê,OEã "w 'n ‚AEŠCˆae‚AEŠCˆae ‚AE‚Ì '½ •-‚Ì ŠC •… OEð Š· ‚Í ‚ ‚é.-{ ŽÀ OE± ‚Å ‚Í,'Î •Û •… ˆae ‚ð ' † ‰› ‚Å2 ‹ae ‰ae ‚É"y "X ‚ÅŽd •Ø ‚è,1‹ae ‰ae ‚̓| ƒ"ƒv ‚É ‚ae ‚éŠC •… "± "ü ‹ae ‚AE