Table 1.
Characterization of the soils used in this study.
Table 2.
Correlation matrix of the soil properties evaluated in this study.
Figure 1.
Relative importance of soil properties in explaining cumulative emission of N2O under different conditions.
Result of partial least squares multivariate analysis performed across ten soils for each of 12 different treatments. Two indices of soil iron (FeA: acid hydroxylamine-extractable iron and FeP: pyrophosphate-extractable iron) were ranked alongside other soil properties commonly considered to control soil N2O emission. The size of each bar is given by the variable importance in the projection (VIP) value, and indicates the relative strength of each variable in explaining emission in that treatment. WHC = water holding capacity; DOC = dissolved organic carbon.
Table 3.
Results of simple linear regression of cumulative N2O emission (as ng N2O-N g−1 soil) against iron, across ten soils and under 12 different conditions.