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Dubakella soil series is the name given to a reddish brown stony loam soil which has developed on ultramafic rock containing magnesium minerals such as serpentine or asbestos.〔https://soilseries.sc.egov.usda.gov/OSD_Docs/D/DUBAKELLA.html Official Series Description〕 This soil occurs from southwestern Oregon south to the Coast Ranges of California near Healdsburg, and it also is found in the Sierra Nevada mountains and foothills. 〔http://casoilresource.lawr.ucdavis.edu/see/#dubakella Series Extent Explorer (DUBAKELLA)〕 In common with other ultramafic soils, Dubakella has a poor balance of nutrients which does not allow the vegetation it supports to match the luxuriance seen on adjacent non-ultramafic sites. Jeffrey Pine is usually the most common tree, accompanied by Douglas-Fir, Incense-Cedar, and Sugar Pine -- all in open, somewhat stunted stands. In some areas, as at Grass Valley, the less stately Gray Pine is dominant.〔https://www.google.ca/maps/@39.2258162,-121.0474607,3a,75y,291.18h,76.97t/data=!3m4!1e1!3m2!1sH_ppfDYbTkOzB_i11BCCzA!2e0!6m1!1e1〕 On the poorest sites vegetation may be held to a chaparral-like state. In addition to being inferior for forestry and poor for agriculture, Dubalkella may present a health hazard due to presence of asbestos. Any Dubakella land which has been developed or is scheduled in that direction should be tested.〔http://www.epa.gov/superfund/health/contaminants/asbestos/pdfs/noa_factsheet.pdf Naturally Occurring Asbestos:Approaches for Reducing Exposure〕 ==References and External Links== * http://casoilresource.lawr.ucdavis.edu/see/#dubakella Series Extent Explorer (DUBAKELLA) * https://soilseries.sc.egov.usda.gov/OSD_Docs/D/DUBAKELLA.html Official Series Description * http://www.epa.gov/superfund/health/contaminants/asbestos/pdfs/noa_factsheet.pdf Naturally Occurring Asbestos:Approaches for Reducing Exposure * https://www.google.ca/maps/@39.2258162,-121.0474607,3a,75y,291.18h,76.97t/data=!3m4!1e1!3m2!1sH_ppfDYbTkOzB_i11BCCzA!2e0!6m1!1e1 Google Street View of Gray Pine on Dubakella loam in Grass Valley *https://www.google.ca/maps/@39.229552,-121.047843,3a,75y,160.91h,98.98t/data=!3m4!1e1!3m2!1sY25c-FI9v_K3OdNhN25SkA!2e0 This developed area of Dubakella loam in Grass Valley, as seen in Google Street View, is home to serpentine-tolerant Sweetgum and Deodar 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dubakella」の詳細全文を読む スポンサード リンク
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