Table S4 Pearson’s correlation analyses of nitrogen (N) transformation rates and other soil properties at the B4 site (4 year after burning, n=16)

GNM / GN / NNM / NA / NN / TC / TN / C/N / δ13C / δ15N / NH4-N / NO3-N / δ15N of NH4-N
GN / 0.778*
NNM / 0.595* / 0.345
NA / 0.591* / 0.378 / 0.998**
NN / 0.371 / -0.163 / 0.544* / 0.487
TC / -0.178 / -0.072 / 0.053 / 0.084 / -0.375
TN / -0.141 / -0.087 / -0.085 / -0.064 / -0.333 / 0.802**
C/N / -0.095 / -0.005 / 0.069 / 0.080 / -0.072 / -0.024 / -0.587*
δ13C / 0.297 / 0.034 / 0.475 / 0.464 / 0.362 / -0.051 / -0.026 / -0.054
δ15N / 0.565 / 0.311 / 0.613* / 0.598* / 0.502* / -0.131 / -0.286 / 0.169 / 0.755**
NH4-N / 0.458 / 0.636* / -0.081 / -0.073 / -0.149 / -0.127 / 0.213 / -0.478 / 0.066 / 0.007
NO3-N / -0.276 / 0.176 / -0.460 / -0.422 / -0.714** / 0.071 / 0.262 / -0.254 / -0.637** / -0.746** / 0.274
δ15N of NH4-N / -0.571 / -0.323 / -0.289 / -0.278 / -0.272 / -0.138 / -0.263 / 0.364 / -0.211 / -0.358 / -0.425 / 0.147
δ15N of NO3--N / -0.125 / -0.233 / 0.297 / 0.305 / 0.068 / 0.394 / -0.075 / 0.643** / 0.073 / 0.244 / -0.599* / -0.376 / 0.233

*P < 0.05, **P < 0.01 (two-tailed)

GNM gross N mineralization rates, GN gross nitrification rates, NNM net N mineralization rates, NA net ammonification rates, NN net nitrification rates, TC total carbon (C), TN total N, C/N ratio ratio of TC to TN, δ13C C isotope composition, δ15N N isotope composition, NH4+-N soil ammonium concentration, and NO3--N soil nitrate concentration

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