Streambank erosion associated with grazing practices in the humid region
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Authors: C. T. Agouridis, D. R. Edwards, S. R. Workman, J. R. Bicudo, B. K. Koostra, E. S. Vanzant, and J. L. Taraba
Date: 2005
Journal: Transactions of the American Society of Agricultural Engineers
Volume: 48
Number: 1
Pages: 181-190
Summary of Methods: Cattle position, stocking densities, and stream discharges were measured to determine the effects of alternate watering sources with and without riparian area fencing on stream cross-sectional data approximately 15 miles northwest of Lexington, KY (38° 02' N, 84° 36' W). Grazing occurred from April 2002-October 2002 then again in January 2003-October 2003. During this time stocking densities were adjusted based on available forage throughout the season. Early in the season, stocking densities ranged from 1670 kg/ha at the beginning of the season to 720 kg/ha at the end of the season. Locations were recorded on a sample of cattle in each pasture using GPS collars over seven 18-day collection periods. Permanent cross-section were established and measured every month from April 2002-November 2003. Percent cattle activity (GPS collar data) within 5 m of cross-sections was calculated.
Article Summary / Main Points:
•The fencing and alternative water sources had limited affects on stream cross-section; however, time of the study may not have been enough to observe changes in cross-sections and volume of erosion.
•Cattle position within the stream cross-section was positively correlated to the level of streambank erosion.
•Visual observations show that cattle activity, which was not measured in this study, had larger affects on stream cross-sections and erosion than cattle presence in riparian areas.
•Cattle loitering areas were not as impacted as areas where cattle were active.
•The exclusion of cattle from riparian areas did not significantly impact stream cross-section, but years may be required to see any morphological benefits.Vegetation Types: Other (includes Forest and Eastern) Riparian and Wetlands
MLRA Ecoregions: 121 Kentucky Bluegrass
Agrovoc Control Words: Riparian zones Rangelands Grazing
Article Review Type: Refereed
Article Type: Experimental Research
Keywords: alternate water source, best management practice, cattle, riparian zone, sediment, riparian fencing
Annotation: The finding from this study are most likely applicable to other streams with similar characteristics in Kentucky, as the soil and streambed characteristics and the careful management of cattle stocking rates may be affected these results.
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