BACKGROUND:Carbonized biomass is a carbon-rich solid product obtained by the pyrolysis of biomass. It has been suggested to mitigate climate change through increased carbon storage and reduction of greenhouse gas emission. The objective of this study was to evaluate carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) emissions from soil after carbonized biomass addition.
METHODS AND RESULTS:The carbonized biomass was made from a pyrolyzer, which a reactor was operated about 400~500 for 5 hours. The treatments were consisted of a ℃ control without input of carbonized biomass and two levels of carbonized biomass inputs as 6.06 Mg/ha for CB-1 and 12.12 Mg/ha for CB-2. Emissions of CO 2 and N 2 O from orchard soil were determined using closed chamber for 13 weeks at 25 of incubation temperature. It was shown that ℃ the cumulative CO 2 were 209.4 g CO 2 /m 2 for CB-1, 206.4 g CO 2 /m 2 for CB-2 and 214.5 g CO 2 /m 2 for the control after experimental periods. The cumulative CO 2 emission was similar in carbonized biomass input treatment compared to the control. It was appeared that cumulative N 2 O emissions were 4,478 mg N 2 O/m 2 for control, 3,227 mg N 2 O/m 2 for CB-1 and 2,324 mg N 2 O/m 2 for CB-2 at the end of experiment. Cumulative N 2 O emission contents significantly decreased with increasing the carbonized biomass input. CONCLUSION: Consequently the carbonized biomass from byproducts such as pear branch residue could suppress the soil N 2 O emission. The results from the study imply that carbonized biomass can be utilized to reduce greenhouse gas emission from the orchard field.
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