Document Detail

Impact of Riparian Zone Protection from Cattle on Nutrient, Bacteria, F-coliphage, , and Loading of an Intermittent Stream.
MedLine Citation:
PMID:  22751075     Owner:  NLM     Status:  In-Data-Review    
This 5-yr study compared, via an upstream-downstream experimental design, nutrient and microbial water quality of an intermittent stream running through a small pasture (∼2.5 animals ha) where cattle are restricted from the riparian zone (restricted cattle access [RCA]) and where cattle have unrestricted access to the stream (unrestricted cattle access [URCA]). Fencing in the RCA excluded pasturing cattle to within ∼3 to 5 m of the stream. Approximately 88% (26/32) of all comparisons of mean contaminant load reduction for lower, higher, and all stream flow conditions during the 5-yr study indicated net contaminant load reductions in the RCA; for the URCA, this percentage was 38% (12/32). For all flow conditions, mean percent load reductions in the RCA for nutrients and bacteria plus F-coliphage were 24 and 23%, respectively. These respective percentages for the URCA were -9 and -57% (positive values are reductions; negative values are increases). However, potentially as a result of protected wildlife habitat in the RCA, the mean percent load reduction for for "all flow" was -321% for the RCA and 60% for the URCA; for , these respective percentages were -209% (RCA) and 73% (URCA). For "all flow" situations, mean load reductions for the RCA were significantly greater ( < 0.1) than those from the URCA for NH-N, dissolved reactive phosphorus (DRP), total coliform, , and . For "high flow" situations, mean load reductions were significantly greater for the RCA for DRP, total coliform, and . For "low flow" conditions, significantly greater mean load reductions were in favor of the RCA for DRP, total P, total coliforms, fecal coliforms, , and . In no case were mean pollutant loads in the URCA significantly higher than RCA pollutant loads. Restricting pasturing livestock to within 3 to 5 m of intermittent streams can improve water quality; however, water quality impairment can occur if livestock have unrestricted access to a stream.
M D Sunohara; E Topp; G Wilkes; N Gottschall; N Neumann; N Ruecker; T H Jones; T A Edge; R Marti; D R Lapen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of environmental quality     Volume:  41     ISSN:  0047-2425     ISO Abbreviation:  J. Environ. Qual.     Publication Date:    2012 Jul-Aug
Date Detail:
Created Date:  2012-07-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330666     Medline TA:  J Environ Qual     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1301-14     Citation Subset:  IM    
Copyright Information:
Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.
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