In the 1970s, the banks of many of Taiwan's rivers and irrigation channels were lined with concrete. Consequently, plants that farmers had long used to stabilize earthen banks, such as Salix kusanoi, Cephalanthus naucleoides (a species of buttonbush), and fish-poison wood (Barringtonia racemosa), ended up displaced, growing only in Ilan's Shaunglienpi Lake.
1970 年代，國內盛行開發整地與河溝水泥化，長期以來被農民當做天然護堤樹的水社柳、風箱樹、穗花棋盤腳等，因為沒有用武之地而被大量挖除，最後棲息地竟只剩下宜蘭雙連埤。