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It remains unclear how nitrogen (N) deposition affects soil methane (CH 4 ) uptake in semiarid and arid zones. An  in situ  field experiment was conducted from 2010 to 2014 to systematically study the effect of various N application rates (0, 10, 30, and 90 kg N ha −1  yr −1 ) on CH 4  flux in alpine grassland in the Tianshan Mountains. No significant influence of N addition on CH 4  uptake was found. Initially the CH 4  uptake rate increased with increasing N application rate by up to 11.5% in 2011 and then there was gradual inhibition by 2014. However, the between-year variability in CH 4  uptake was very highly significant with average uptake ranging from 52.9 to 106.6 μg C m −2  h −1  and the rate depended largely on seasonal variability in precipitation and temperature. CH 4  uptake was positively correlated with soil temperature, air temperature and to a lesser extent with precipitation, and was negatively correlated with soil moisture and NO 3  − -N content. The results indicate that between-year variability in CH 4  uptake was impacted by precipitation and temperature and was not sensitive to elevated N deposition in alpine grassland.

A five-year study of the impact of nitrogen addition on methane uptake in alpine grassland