Graduate Thesis Or Dissertation

 

Interrelationships of spodosols, andepts, and ultisols on coastal terraces in Curry County, Oregon Public Deposited

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  • Distribution and characteristics of soils were determined across a series of six coastal terraces in Curry Co., Oregon. Classification of soils and interrelationships of properties were determined. Soil-landscape relationships were examined and soil profile development related to relative ages of terraces. Ten pedons were sampled from five terraces of Pleistocene age. All profiles were analyzed for particle size distribution; bulk density; water retention, -1.5 MPa; aluminum and iron extracted with oxalate, citrate-dithionite and sodium pyrophosphate; pH; phosphate retention; exchangeable aluminum; organic carbon; and cation exchange capacity. Andeptic Humitropepts occur on intermediate terraces, in close proximity to the coast. Andeptic Haplohumults occur on the better drained areas of the intermediate terrace, but further inland. Soils in less well drained areas of the intermediate and higher terraces classify as Spodosols, based on morphological features. Ultisols occur on the highest terraces. Profile morphology, particle size and iron extracts are compared between terraces to derive age relationships.
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