印旛沼での建設工事に伴う代替処置としてのョシ原復元手法の検討

摘要

The Narita new rapid transit railway and the general highway No.464 north Chiba road ware maintained as a elevated bridge that crosses the Inba marsh. Rare birds as Eurasian Bittern lived in reed field where the plan place of the bridge. This thesis reports that newly development of reed field creation technique in a short term. There ware 2 conditions, the improved land has subsided and width of the growth belt was not wide. The technique reached as a result nearly to an existing reed field in two years, using new stalks of reed by planting method in the group. Growth became excellent because the waterway was made and observing the pF value and water level of underground. Amphibia Tokyo Daruma Pond Frog and ichthyic Stone moroko fish that bird's food ware confirmed. It seems that 3 conditions, ORP, PF value and soil hardness that seemed relate to the growth of reeds for a certain period of the same valley,and those stalks was planted by planting method in the group.%東京と成田を短時間で結ぶ成田新高速鉄道並びに千葉 県北部地区の地域活性化を図るために整備されているー般国道464号線北千葉道路は、印旛沼高架橋により印旛 沼を横断しているが、橋梁の整備箇所には自然のョシ原 が広がっていて、事業により消失するョシ原の代替が求 められていた。本報告は、建設事業に伴う代替措置として千葉県北印 旛沼で実施されたョシ原復元事業にぉいて、地域特性に 合わせた早期のョシ原復元手法を検討し、一定の成果を 得たので報告するものである。