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nitrogen deposition(11)
alpine meadow(6)
soil respiration(5)
atmospheric n deposition(4)
carbon sequestration(4)
global change(4)
nitrous oxide(4)
climate change(3)
community structure(3)
denitrification(3)
greenhouse gas(3)
greenhouse gases(3)
nitrogen addition(3)
warming(3)
aerosol(2)
ammonia(2)
changes in precipitation(2)
co2(2)
emission factor(2)
methane(2)
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