countermeasure to mitigate methane (CH 4) emissions, but its mechanism and effective
duration has not yet been adequately elucidated. A laboratory incubation experiment was
performed to gain insight into the combined effects of fresh and six-year aged biochar on
potential methane oxidation (PMO) in paddy soils with ammonium or nitrate-amendment.
Results showed that both ammonium and nitrate were essential for CH 4 oxidation though …