Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 48, Issue 8, Pages 941-946Publisher
SPRINGER
DOI: 10.1007/s00374-012-0687-0
Keywords
Biochar; Gross N mineralization; NO3- immobilization; N2O production
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Funding
- University of Alberta
- Natural Science and Engineering Research Council of Canada (NSERC)
- National Basic Research Program of China [2010CB434812]
- National Natural Science Foundation of China [40921061]
- Innovative Scholar Development Program of Jiangsu Province [SBK20082282]
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A laboratory incubation experiment was conducted to investigate the effects of direct incorporation of either wheat straw or its biochar into a cultivated Chernozem on gross N transformations calculated by the N-15 pool dilution technique and nitrous oxide (N2O) production rates. Incorporation of wheat straw stimulated gross NH (4) (+) (ammonium) and NO (3) (-) (nitrate) immobilization rates by 302 and 95.2 %, respectively, suppressed gross nitrification rates by 32.2 %, and increased N2O production by 37.7 %. In contrast, the addition of a biochar produced from the wheat straw did not influence any of the above N cycling processes. Therefore, application of biochar could be a possible management strategy for long-term C sequestration (through soil storage of stable C contained in the biochar) in soils without increasing N2O production rates, but could not effectively immobilize NO (3) (-) in the soil.
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