甲烷或N2O的排放通量计算公式如下[1-4]:

式 中, F为CH4 (以C计) 或N2O (以N计) 排放通量, mg·m-2·h-1或μg·m-2·h-1;
ρ为标准状况下CH4或N2O的密度, 分别为0.54和1.25 g·L-1;
V为采样箱体积, m3;
A为采样底座内的表面积, m2;
ΔC/Δt表示CH4或N2O的排放速率, μL·L-1·h-1或nL·L-1·h-1;
T为采样箱内温度, ℃。
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