| http://www.w3.org/ns/prov#value | - Ultrabasic soils derived from >70% ferromagnesian or mafic parent rock materials, including serpentine, olivine, and hornblendes, that have high levels of nickel, chromium, and other heavy metals and low levels of calcium, magnesium, and other nutritionally essential minerals that plants can uptake in a chemically available state (Kruckeberg 1984, Wyllie 1967).
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