旧松尾鉱山露天掘跡地における緑化工施工地の土壌特性

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Vegetation and soil surveys of open-cut mining lands revegetated from 1982 to 1992 were carried out in the past Matsuo sulfur mine, Iwate Prefecture. Almost all the soils in revegetated open-cut mining lands ranged from pH 3 to 6 and about 40% of the soils were less than pH4. The soils were characterized by high exchange acidity and a small amount of exchangeable Ca. The soils gave low N and organic C contents due to the sparse vegetation. At places influenced by strongly acidic ground water from the pyrite mine, which came from buried galleries and shafts ; revegetated plants were completely damaged. Therefore, proper soil management practices such as over-seeding, application of fertilizer and liming are necessary to conserve the revegetated open-cut mining slopes from soil erosion. At the places of pyrite and its slag sediments, which have pH values of <3,no vegetation tend to thrive. At an alluvial soil with pH 3 to 4,acid-resistant plants such as Ledum palustre L. var. diversipilosum NAKAI, Hydrangea paniculata SIEB. and Miscanthus sinensis ANDE. are dominant. At volcanic ash soils of pH 4 to 5,however, Bambusa kurilensis Rupr. MIYABE, Betula Ermani var. Communis KOID., Sorbus commixta HEDL., Salix Reinii FRANCH. et SAV., Hydrangea paniculata SIEB., Polygonum sachalinese FR. SCHM. and Miscanthus sinensis ANDE. are dominant. Lastly, at the weathering materials from andesitic tufficeous rock of pH 5 to 6,common vegetation is observed. Since it is very difficult to keep grassland in the cold climate and heavy snow area, the introduction of tree species such as Salix Reinii FRANCH. et SAV., Salix Bakko KIMURA and Elaeagnus crispa THUN. were recommended as the revegetation plants.
社団法人日本土壌肥料学会の論文
1995-10-05

旧松尾鉱山露天掘跡地における緑化工施工地の土壌特性

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