fig3

Figure 3. Soil taxonomic thermal and moisture regimes^[60] with distinct ecosystems highlighted: Soil thermal regimes with their annual mean ± seasonal variation; Soil moisture regimes: Aridic, very dry water deficit most of year; Ustic, dry water deficit part of year; Xeric, dry to moist water deficit some years; Udic, moist no deficit most years; Aquic, very wet saturated part of year; Peraquic, saturated most of year (anaerobic). Overlaid arrows are examples of approximate regime shifts when deep soils are warmed during incubation studies^[99-102] that assess SOC temperature sensitivity of decomposition [Supplementary Table 2]. SOC: Soil organic carbon.