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biochar(2)
co_2(1)
freeze-thaw cycles(1)
global climate change(1)
global warming potential (gwp)(1)
microbial biomass nitrogen(1)
n_2o(1)
n_2o gas(1)
nitrification rate(1)
nitrogen cycling(1)
nitrogen loss(1)
nitrogen mineralization(1)
nitrogen transformation(1)
nitrous oxide(1)
straw return(1)
the north china plain(1)