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SWRC Bulletin (Summer 2005)
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The SWRC Quarterly

Sound Science for Watershed Decisions

Summer 2005


Latest Science Results (not yet published)

(click on title for more information)


Tracing sediment dynamics and sources in eroding rills with rare earth elements


Watershed monitoring and research at the Walnut Gulch Experimental Watershed, Arizona, USA.


Amino acid enrichment following soybean in an Iowa corn-soybean rotation.


Comparison of responses from multiple soil moisture sensors installed in a semi-arid shrub dominated rangeland site.


Ecosystem water use efficiency in a rangeland shrub and grass plant


Inferences of all-sky irradiance using terra and AGUA  MODIS and GOES-10 satellite data


Empirical analysis and prediction of nitrate loading and crop yield for a corn-soybean rotation


AGWA design documentation:  Migrating to ARCGIS and the internet


Sensitivity of riparian ecosystems to moisture pulses in semiarid environments


Organic forms of nitrogen


Speciation of selenium (IV) and selenium (VI) using coupled ION Chomatography - Hydride generation atomic absorption spectrometry


Papers Published This Quarter:

(click on title to download a reprint)


Thoma, D., Gupta, S., Strock, J., Moncrief, J. 2005. Tillage and nutrient source effects on water quality and corn grain yield from a flat landscape.J. Environ. Qual. 34:1102-1111.


O'Neal, M.R., Nearing, M.A., Vining, R.C., Southworth, J., Pfeifer, R.A. 2005. Climate change impacts on soil erosion in Midwest United States with changes in corn-soybean-wheat management.Catena 61(2-3): 165-184.


Ritchie, J.C., Nearing, M.A., Nichols, M.H., Ritchie, C.A. 2005. Patterns of soil erosion and redeposition on Luckly Hills watershed, Walnut Gulch Experimental Watershed, Arizona.Catena 61(2-3):122-130.


Nearing, M.A., Jetten, V., Baffaut, C., Cerdan, O., Couturier, A., Hernandez, M., Le Bissonnais, Y., Nichols, M.H., Nunes, J.P., Renschler, C.S., Souchere, V., van Oost, K. 2005. Modeling response of soil erosion and runoff to changes in precipitation and cover.Catena 61(2-3):131-134.


Canfield, H.E., Lane, L.J., Wilson, C.J., Crowell, K.J., Thomas, W.A. 0. Modeling scour and deposition in ephemeral channels after wildfire.Catena 61(2-3): 122-130.


McLain, J.E.T., Martens, D.A. 2005. Nitrous oxide flux from soil amino acid mineralization.Soil Biology & Biochem. 37:289-299.

Our full publication list is available at . 


Future Science Events:

The second annual RISE symposium and the second Interagency Conference on Research in the Watersheds are being planned.  Also, SWRC will be contributing to plans for the ARS Water Resources National Program and the Intergovernmental Panel on Climate Change. (click here for more information)


Rainfall Report:





WGEW and SRER data can be downloaded from the web site at   



Congratulations to Mary Nichols for receiving a Superior Paper Award from ASAE for her work with radio rocks.(click here for more information)


Staff News:
SWRC gets more international recognition with an SWRC book being translated into Chinese (great work, Ken) and a visit from scientists from the Kurdistan region of Iraq.  (click here for more information)


SWRC Quarterly:

Contact the SWRC Research Leader, Dr. Susan Moran at 670-6380 X171 or  Mailing address is USDA ARS SWRC, 2000 E. Allen Rd., Tucson, AZ85719 and web address is .  The SWRC Quarterly is on-line at  /News/News.htm?modecode=53-42-45-00. 


SWRC Mission:

The Southwest Watershed Research Center conducts long-term research of soil, water and climate processes to better understand interactions with plants, animals and humans as a basis for management of semiarid watersheds.  SWRC develops new technologies for land managers, including remote sensing, computer-aided decision tools, and ecosystem models.