“…For example, organic C forms co-precipitated complexes with Fe-(oxyhydr)oxides, where phosphorus (P) also strongly sorbs to Fe-(oxyhydr)oxides, and so Fe(III)-reducing bacteria can significantly impact the coupled C-Fe-P cycle during redox oscillations and dissimilatory Fe(III) reduction [30,41,52,53]. The microbiome of tropical soils has been shown to quickly respond to different redox-oscillating conditions and there are many biogeochemical pathways that may be hypothesized to shift due to climatedriven redox perturbations now and in the immediate future [16,38,46]. For instance, CH 4 production and high methanogenic activity have been observed in tropical soils in the field and when incubated under different levels of headspace O 2 in the laboratory [15,16], which is important because soil aeration in the field is sensitive to the effects of climate change.…”