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Runoff and Sediments from Hillslope 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

View larger version (203K): [in this window] [in a new window]   Fig. 1. Study area location and physiographic provinces of the Southwest.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Long-term average monthly precipitation (1949–2005) for Zuni, NM (from the Western Regional Climate Center (2006).

View larger version (78K): [in this window] [in a new window]   Fig. 3. Topography, slope positions, and runoff plot locations within the three watershed study sites on the Zuni Indian Reservation (modified from Norton et al., 2003).

View larger version (16K): [in this window] [in a new window]   Fig. 4. Distribution of summer (April–September) daily precipitation, 1896 to 1985, Zuni Pueblo (as compiled by Balling and Wells, 1990).

View larger version (15K): [in this window] [in a new window]   Fig. 5. Relationship between sediment yield and concentrations of C and N in sediments. *,** Significant at 0.05 and 0.01 levels, respectively.

View larger version (13K): [in this window] [in a new window]   Fig. 6. Sediment C/N for the 1996 to 1998 rainy season (July–September) from 20-m2 runoff plots plotted against Day of the Year of the storm. Yields of total sediment, organic material, and particle-size distribution do not follow significant trends with respect to date.