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Published online 1 March 2007
Published in J Environ Qual 36:540-548 (2007)
DOI: 10.2134/jeq2006.0352
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sources of Sediment and Phosphorus in Stream Flow of a Highly Productive Dairy Farmed Catchment

R. W. McDowella,* and R. J. Wilcockb

a AgResearch Ltd, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand
b National Institute of Water and Atmospheric Research, P.O. Box 11 115, Hamilton, New Zealand


Figure 1
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  		Fig. 1. Elevation (m above sea level) and location of sampling site within the Waiokura catchment, Taranaki, New Zealand.

 

Figure 2
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  		Fig. 2. Flow and concentrations of dissolved reactive P, total P, and suspended sediment at the catchment outlet. Autumn = Mar. through May, Winter = June through Aug., Spring = Sept. through Nov., Summer = Dec. through Feb.

 

Figure 3
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  		Fig. 3. Mean (± 95% confidence intervals) concentrations of bioavailable P, total P, and suspended sediment trapped within the samplers (n = 6) each month. Autumn = Mar. through May, Winter = June through Aug., Spring = Sept. through Nov., Summer = Dec. through Feb.

 

Figure 4
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  		Fig. 4. Cesium-137 activity in topsoil, subsoil, bed, and bank sediment and suspended sediment captured by in-stream samplers each season. Error bars are 95% confidence intervals.

 




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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.