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Rapidly Eroding Piñon–Juniper Woodlands in New Mexico

Response to Slash Treatment

Brian K. Hastings*, Freeman M. Smith and Brian F. Jacobs

Watershed Science Program, Colorado State Univ., Fort Collins, Colorado 80523



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Fig. 1. Study location: Bandelier Watershed Restoration Project, Bandelier National Monument, New Mexico.

 


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Fig. 2. Study-period precipitation (2000–2001) versus long-term average precipitation (1925–2001). Historical precipitation error bars represent one standard deviation with 76 yr of data. Error bars for 2000–2001 data represent one standard deviation of 12 rain gauges. June 2000 represents mean precipitation and standard deviation of three rain gauges.

 


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Fig. 3. Seasonal sediment yields (Mg/ha) for treatment (n = 6) and control (n = 6) microwatersheds, 2000 and 2001. Error bars represent one standard deviation.

 


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Fig. 4. Effects of slash treatment on soil loss as a function of rainfall erosivity, 2000 and 2001. Control, n = 90; treatment, n = 90. Data are transformed using the natural logarithm.

 


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Fig. 5. Pre-slash treatment (1996) ground cover within the control and treatment watersheds as compared to post-slash treatment ground cover for each microwatershed during the study period (2000 and 2001). Ground cover includes slash and vegetation in intercanopy areas.

 


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Fig. 6. Relationship of intercanopy ground cover and sediment yield for nonpumice soils. Average ground cover: pre-growing season (June 2000 and 2001), n = 16; post-growing season (September 2000 and 2001), n = 16.

 





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