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Published online 31 August 2007
Published in J Environ Qual 36:1470-1478 (2007)
DOI: 10.2134/jeq2006.0530
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Nitrogen Mineralization and Microbial Activity in Oil Sands Reclaimed Boreal Forest Soils

R. McMillan, S. A. Quideau*, M. D. MacKenzie and O. Biryukova

Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB Canada T6G 2E3


Figure 1
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  		Fig. 1. Gross nitrogen (N) ammonification (a) and nitrification (b) rates (mg N kg–1 d–1) as determined in June 2004 for oil sand reclamation treatments (L/S: forest floor-mineral mix over secondary; L/PM: forest floor-mineral mix over peat-mineral mix; PM: peat-mineral mix) compared to forest floor (NLFH) from an undisturbed natural forest site. Errors bars represent one standard error from the means (n = 3), and different letters signify significant differences among materials at {alpha} = 0.05.

 

Figure 2
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  		Fig. 2. Net nitrogen (N) ammonification (a), nitrification (b) and mineralization (c) rates (mg N kg–1 mo–1) for oil sand reclamation treatments (L/S: forest floor-mineral mix over secondary; L/PM: forest floor-mineral mix over peat-mineral mix; PM: peat-mineral mix) compared to forest floor (NLFH) from an undisturbed natural forest site. Errors bars represent one standard error from the means (n = 3), and different letters signify significant differences among materials at {alpha} = 0.05.

 

Figure 3
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  		Fig. 3. Relative nitrification index (RNI) for oil sand reclamation treatments (L/S: forest floor-mineral mix over secondary; L/PM: forest floor-mineral mix over peat-mineral mix; PM: peat-mineral mix) compared to forest floor (NLFH) from an undisturbed natural forest site. Errors bars represent one standard error from the means (n = 3), and different letters signify significant differences among materials at {alpha} = 0.05.

 

Figure 4
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  		Fig. 4. (a) Respiration rate (mg C g–1 d–1), (b) microbial biomass C (mg C kg–1), and (c) microbial biomass N (mg N kg–1) for a moisture manipulation experiment performed with oil sand reclamation treatments (L/S: forest floor-mineral mix over secondary; L/PM: forest floor-mineral mix over peat-mineral mix; PM: peat-mineral mix) compared to un-manipulated forest floor (NLFH) from an undisturbed natural forest site. Errors bars represent one standard error from the means (n = 3), and different letters signify significant differences among materials at {alpha} = 0.05.

 




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