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Published online 17 July 2007
Published in J Environ Qual 36:1289-1300 (2007)
DOI: 10.2134/jeq2006.0502
© 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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Relationships between Soil and Runoff Phosphorus in Small Alberta Watersheds

Joanne L. Littlea,*, Sheilah C. Nolana, Janna P. Cassonb and Barry M. Olsonb

a Alberta Agriculture and Food, Conservation and Development Branch, 206, 7000, 113 St. Edmonton, AB, T6H 5T6
b Alberta Agriculture and Food, Irrigation Branch, 100, 5401, 1st Ave S., Lethbridge, AB T1J 4V6


Figure 1
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  		Fig. 1. Microwatershed sites in Alberta, Canada.

 

Figure 2
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  		Fig. 2. Phosphorus sorption indices (PSI) and degree of soil phosphorus saturation (DPS) in the 0- to 2.5-cm soil layer at the microwatershed sites in the fall of 2003. Standard error bars are shown. Bars with the same letter above for that parameter are not significantly different (P < 0.05).

 

Figure 3
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  		Fig. 3. Relationships between soil test phosphorus (STP) and the flow-weighted mean concentrations (FWMC) of (a) dissolved reactive phosphorus (DRP) and (b) total phosphorus (TP) from the microwatershed sites.

 

Figure 4
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  		Fig. 4. Relationship between the degree of phosphorus saturation (DPS) in the 0- to 2.5-cm soil layer and the flow-weighted mean concentration (FWMC) of dissolved reactive phosphorus (DRP) and total phosphorus (TP). The equations and r2 values refer to the curvilinear relationships, which includes DPS values equal to and greater than the change points.

 




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