There is a strong trend indicating that CH 4 uptake decreases with increasing duration of grazing activities, and that significant decreases occur when the grazing exceeds 5 years, and especially when it exceeds 10 years duration (Fig. 1 ).
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The sentences
The RR of soil CH 4 uptake showed a trend of negative correlation with RR of soil temperature (Fig. 3 a), but significantly positive correlation with RR of aboveground biomass was observed (Fig. 3 b).