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An incubation study was conducted to test the effects of phosphorus (P) addition on nitrous oxide (N 2 O) emissions from the soils taken from two tropical rain forests established on different parent materials [meta-sedimentary (MS) and ultrabasic (UB) rock] on Mt. Kinabalu, Borneo. Earlier studies suggest that the forest on UB soils is more strongly limited by P than that on MS soils is. In MS soils, P addition significantly reduced N 2 O emissions. Since neither ammonium (NH 4  + ) nor nitrate (NO 3  − ) contents were reduced by P addition, we assumed that the decrease in N 2 O emissions were not due to the previously-reported mechanism: P addition stimulated microbial nitrogen (N) immobilization and collateral inorganic N consumption, reducing resources for producing N 2 O. Since P addition enhanced the ratios of microbial biomass to CO 2  and N 2 O emissions (indicators of nitrifying and/or denitrifying respiratory efficiency), it was suggested that the N required for the respiration of nitrifying and/or denitrifying bacteria was reduced, leading to reduced N 2 O emissions. On the other hand, P addition had no effects on N 2 O emissions in UB soils. The respiratory efficiency did not change significantly by P addition, possibly because the microbial community in the highly-P-depleted UB soils shifted by P addition, with which the enhancement of respiration efficiency did not co-vary. We concluded that (1) P addition may control N 2 O emissions through increasing respiratory efficiency, and (2) the effects may be different depending on the differences in P availability.

Contrasting effects of exogenous phosphorus application on N2O emissions from two tropical forest soils with contrasting phosphorus availability