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

Furthermore, the ambient temperature has increased by 1 °C over the past 50 years and precipitation shows a significant increasing trend in the 1980s and 1990s, and the average annual precipitation shows an increasing trend with a magnitude of 6.8 mm per decade 37 , while warming has decreased soil moisture content and enhanced the potential for oxidation of CH 4 38 .

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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.

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