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Organic Matter Transformations through Arroyos and Alluvial Fan Soils within a Native American Agroecosystem

^a Dep. of Renewable Resources, Univ. of Wyoming, Laramie, WY 82071-3354
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010
^c Dep. of Biology, Univ. of New Mexico, Albuquerque, NM 87131
^d Zuni Conservation Program, Pueblo of Zuni, P.O. Box 339, Zuni, NM 87327

View larger version (205K): [in this window] [in a new window]   Fig. 1. Study area location and physiographic provinces of the Southwest.

View larger version (72K): [in this window] [in a new window]   Fig. 2. Study watersheds showing channel reaches and suspended sediment trap locations.

View larger version (27K): [in this window] [in a new window]   Fig. 3. General topography, slope positions, and soils within the three watershed study sites on the Zuni Indian Reservation (from Norton et al., 2003).

View larger version (36K): [in this window] [in a new window]   Fig. 4. Composition of organic-rich stream deposits as a function of distance from channel source. Sampling of the Sanchez watershed began approximately 500 m from its source. Weekoty watershed is reported in left column (a–e) and Sanchez watershed in right (f–j).

View larger version (39K): [in this window] [in a new window]   Fig. 5. Relationships between total and available nutrients and stream course position in organic-rich stream deposits. Weekoty watershed is reported in left column (a–d) and Sanchez watershed in right (e–h).

View larger version (15K): [in this window] [in a new window]   Fig. 6. Sediment concentration as a function of rainfall intensity as measured at suspended sediment traps and tipping bucket rain gauge in the Weekoty watershed.

View larger version (15K): [in this window] [in a new window]   Fig. 7. Carbon/N ratio of sediment organic matter as a function of sediment concentration at suspended sediment traps in the Weekoty watershed.

View larger version (30K): [in this window] [in a new window]   Fig. 8. Concentrations of organic C, total N, and total P in suspended sediment as a function of distance from channel source. Weekoty watershed is reported in left column (a–d) and Sanchez watershed in right (e–h).