(First upload on June 14 2003. Last on July 1 2024) [ 日本語 | English ]
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
HOME > Plant list (植物リスト) > Polygonaceae (タデ科) > Rumex obtusifolius
Rumex L. (スイバ)Ezo-nogishigishi (エゾノギシギシ, 蝦夷ノ羊蹄), bitter-dock (broad-leaved-dock)Hirohagishigishi (ヒロハギシギシ, 広葉羊蹄) Lifeform: deciduous forb Distribution: native to Europe, now widespread exotic weed (雑草) in Japan Habitat: disturbed sites, including pastures R. obtusifolius from the former topsoil on Mount Usu 1
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Seeds extracted from the former topsoilSeed germination method2 Seedlings emerged from the former topsoil collected in September. The photo was taken on December 24 2008. The experiment was conducted in the greenhouse of Center of Advanced Science and Technology (CAST), HU.Seed flotation method3/4 R. obtusifolius seeds, extracted by a centrifuged floation method, in the fall of 2008, 30 years after the 1977-78 eruptions. (Tsuyuzaki & Goto 2001, Tsuyuzaki 2010) |
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[1/2] in Toya Lake Experimental Station, Hokkaido University, on September 8 2009. [3] fruits. at Muroran Marine Experimental Station, HU, on August 23 2010. [4] a rosette in front of GSES, HU, on April 19 2014. [6] along a paved road on a small hill near Sub-Ranger House, Toyotomi Town, northern Hokkaido, soon after snow-melt on April 23 2016. [5] on a peatland mined in 1972, Sarobetsu mire, northern Japan, on June 19 2020 (Egawa et al. 2017). [6] in an open land, N12/E2, East Ward, Sapporo, on June 4 2024.
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[1/2] in a greenhouse on January 29 2020. The concentration of fertilizer is different at three levels
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