Interventions to reduce pollution were (a) construction of a sewage system in the 1960s and (b) pumping of tap water leakage from 2003. Historically, the lake under the bog was polluted by sewage from a hospital, discharge/leakage of tap water from a purification plant and runoff from a road. Of nine abundant vascular plant species, cover of three decreased (including sedge Carex thunbergii and bogbean Menyanthes trifoliata), cover of three increased (including swamp millet Isachne globosa) and cover of three did not change (including common reed Phragmites australis). The area of moss mats (dominated by feathery bog moss Sphagnum cuspidatum) increased from 420 m 2 to 1,010 m 2. Between 19, the area of moss hummocks (containing blunt-leaved bog moss Sphagnum palustre) increased from 5,900 m 2 to 8,500 m 2. Cover of vascular plant species showed mixed responses. 2010) found that after removing polluting water sources (sewage and tap water), cover of Sphagnum moss increased.
Divert/replace polluted water source(s)Ī study in 1980–2006 in a floating bog in Japan (Tsujino et al.
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