Sam’s new paper “non-destructive estimates of soil carbonic anhydrase activity and associated soil water oxygen isotope composition” is now published in Hydrology and Earth System Sciences. In this paper, we present a non-destructive method to retrieve simultaneously the soil carbonic anhydrase activity and the oxygen isotopic composition of soil water that interacts with atmospheric CO2. A main conclusion is that CO2 may be principally interacting with water pools associated with particle surfaces rather than the bulk water pool. For more details just click here!
Figure 5. Relationships between water-filled pore space and the difference between estimates of the d18O of soil water in equilibrium with CO2, as estimated from gas flux measurements (dsw,eq), and that estimated by cryogenic extraction (dsw,ce) at depths of 0–1 cm (squares) and 1–5 cm (circles). Dashed lines and shaded areas indicate the linear regressions and associated 95% confidence intervals for the two sampling depths.