Fig. 3: The effects of fertilizer N addition and soil fertilization history on the abundance of functional genes involved in N2O emissions.
From: Legacy effects cause systematic underestimation of N2O emission factors
a the abundance of nirK gene; b the abundance of nirS gene; c the abundance of nosZ gene; d the ratio of the abundances of nirK plus nirS to the abundance of nosZ. −N − N, long-term zero N fertilizer input; +N − N, short-term zero N fertilizer input; +N + N, long-term N fertilizer input. Error bars indicate standard errors. Different letters represent significant differences (p < 0.05). Source data are provided as a Source Data file.
