Weathering of Mt. St. Helens tephra under a cryic-udic climatic regime

The initial stages of chemical weathering in tephra were examined during a 10-yr period under field conditions in a cryic-udic climatic regime. Unleached tephra from the 1980 eruption of Mt. St. Helens was applied to the surface of soils in 5- and 15-cm depths to simulate natural tephra deposition o...

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