Impact of agriculture on the soil sink for methane

Tillage can largely reduce the soil CH₄ sink because of its long inhibition on soil CH₄ uptake．Ammonium can inhibit CH₄ oxidation in the soi1 but nitrate can not do that．The effect of ammonium inhibition on soil CH₄ oxidation is better than the manure with the same amount of nitrogen as ammonium．Crop residue that has small C／N ratio or can lead to soil acidification has a large inhibition on soll CH₄ oxidation．Biowaste compost has a short-term inhibition on soll CH₄ oxidation．Irrigation and the use of pesticide can decrease the soil CK,uptake．No-tillage，application of ammonium and organic fertilizer are the available measures to remain or increase the potential of CH₄ uptake in arable soil.