본 연구는 농가에서 버려지는 부산물을 탄화물로 변환한 후 토양에 적용하여 토양의 화학적 특성 변화와 온실가스 발생량을 비교하였다. 탄화물로의 활용은 세 가지의 장점이 있었다. 첫 번째 버려지는 자원은 활용하여 재이용한 측면, 두번째 농경지의 토양탄소 함량을 증진 시킬 수 있는 측면, 세번째 농경지에서 발생하는 아산화질소를 줄일 수 있는 측면에서 유용할 것으로 판단된다. 하지만 N2O 감축기작에 대한 정확한 파악을 위해 질소순환과 연계된 추가적인 연구가 필요하다.
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 studywas to evaluate carbon dioxide (CO2) and nitrous oxide (N2O) emissions from soil after carbonized biomass addition.
METHODSANDRESULTS: The carbonized biomasswas made froma pyrolyzer, which a reactorwas operated about 400~500 for 5 hours. The ℃ treatmentswere consisted of a control without input of carbonized biomass and two levels of carbonized biomass inputs as 6.06Mg/ha for CB-1 and 12.12 Mg/ha for CB-2. Emissions of CO2 and N2O from orchard soil were determined using closed chamber for 13 weeks at 25℃ of incubation temperature. Itwas shown that the cumulativeCO2 were 209.4 g CO2/m2 for CB-1, 206.4 g CO2/m2 for CB-2 and 214.5 g CO2/m2 for the control after experimental periods. The cumulative CO2 emission was similar in carbonized biomass input treatment compared to the control. Itwas appeared that cumulativeN2O emissions were 4,478 mg N2O/m2 for control, 3,227 mg N2O/m2 for CB-1 and 2,324 mg N2O/m2 for CB-2 at the end of experiment. CumulativeN2O emission contents significantly decreased with increasing the carbonized biomass input.
CONCLUSION: Consequently the carbonized biomass frombyproducts such as pear branch residue could suppress the soilN2Oemission. The results fromthe study imply that carbonized biomass can be utilized to reduce greenhouse gas emission from the orchard field.