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Abstract
Nitrous oxide emission from temperate meadow grassland was measured using a closed chamber method at two experimental sites in China. In the four-month measurement period, the N O fluxes in mown meadow grasslands 2 22 21 of the Songnen Plain and of the Kerqin Steppe were on average 41.1 and 7.9 mg N O-N m h , respectively. 2 Considering the influence of grassland type and degradation extent, an empirical formula was constructed, with which the annual N O emission from temperate grassland of China was estimated as 40.4 Gg N. Meadow 2 grassland, accounting for 14.0% of the total grassland area, contributed 28.4% of the total N O emission. 2
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