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Published online 16 October 2007
Published in J Environ Qual 36:1686-1694 (2007)
DOI: 10.2134/jeq2007.0029
© 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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Determining Long-Term (Decadal) Deep Drainage Rate Using Multiple Tracers

Bing C. Si* and Eeltje de Jong

Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK, Canada


Figure 1
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  		Fig. 1. Geographic location of the research site at Laura, Saskatchewan, Canada.

 

Figure 2
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  		Fig. 2. Difference between (a) annual precipitation and long-term annual average and (b) annual average temperature and long-term average. Dashed lines represent the long-term average. Climate data are collected from a nearby location Saskatoon, Saskatchewan, Canada (Environment Canada, 2007).

 

Figure 3
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  		Fig. 3. Depth distribution of sand content and soil water content ({theta}) at different times in 4 yr.

 

Figure 4
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  		Fig. 4. Depth distribution of (a) 3H, (b) Cl–, and (c) NO3– concentration in the two cores (pooled data).

 

Figure 5
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  		Fig. 5. Depth distribution of natural Cl– concentration at a plot. The soil core was taken to the depth of 6 m. The sampling interval was 0.3 m. Landscape position of the core was similar to Fig. 4.

 

Figure 6
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  		Fig. 6. Monthly soil temperature at 100- and 150-cm depth and the vapor water flux based on soil temperature gradient between the two depths. The soil temperature data are the monthly normal from 1971 to 2003, obtained from the Saskatoon SRC weather station.

 




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