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Published online 20 November 2006
Published in Vadose Zone J 5:1236-1245 (2006)
DOI: 10.2136/vzj2006.0073
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrous Oxide and Ammonia Emissions from Urine-Treated Soils

Texture Effect

Olga Singurindy, Brian K. Richards*, Marina Molodovskaya and Tammo S. Steenhuis

Dep. of Biological and Environmental Engineering, Riley-Robb Hall, Cornell Univ., Ithaca, NY 14853

Figure 1
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  		Fig. 1. Schematic diagram of the experimental setup for flow-through experiments.

 

Figure 2
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  		Fig. 2. Cumulative amount of N-NH3 and urine losses with time from fine and coarse sand, 2000 mL/min flow rate, 60% of urine-filled pore space, and 75% air relative humidity. Arrows show the initial stage of the experiment when ~85% of the NH3 was volatilized.

 

Figure 3
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  		Fig. 3. Relationship between the initial NH3 volatilization rate and the air flow rate for two sand types, 60% urine-filled pore space, and 75% air relative humidity.

 

Figure 4
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  		Fig. 4. Distribution of air-filled pore space (complementary with urine-filled pore space) with depth for fine and coarse sands at 10, 60, and 90% of initial urine-filled pore space (5 h after filling).

 

Figure 5
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  		Fig. 5. A generalized relationship between air-filled pore space and N2O fluxes in fine and coarse sand and two sample thicknesses: (a) 5 cm, and (b) 1 cm; hatched area demonstrates the input of denitrification.

 

Figure 6
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  		Fig. 6. Air-filled pore space and N2O emission factor changes with depth and time: (a) fine-textured sand, (b) coarse-textured sand; 1250 mL/min initial air flow rate. Underlined numbers are N2O emission factors in gaseous form. Numbers in parentheses represent N2O dissolved in urine.

 

Figure 7
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  		Fig. 7. Evolution of N2O emission measured in headspace, 1250 mL/min initial air flow rate.

 

Figure 8
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  		Fig. 8. Relationship between sand oxidation–reduction potential and N2O emission factor in static headspace and flow-through experiments.

 




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