Ultramafic soils are sort of unusual because they form from rocks with large concentrations of nickel.

超镁铁质土壤有点不太常见，它们由富含镍的岩石形成的。

The tree is called Pycnandra acuminata, and it grows in the rainforests in what are called ultramafic soils.

这种树叫做尖尾木桐，它生长在热带雨林的超镁铁质土壤中。