Table 1 Relative abundance of magnetically ordered FeIII (oxyhydr)oxides in 57Fe Mössbauer spectra of the initial unreacted soil and the amended 57Fe (corrected to exclude the signal from the native soil Fe), as a function of temperature.
From: Iron-mediated organic matter decomposition in humid soils can counteract protection
Magneticially ordered FeIII-(oxyhydr)oxides (%) | Crystallinity index | |||||||
|---|---|---|---|---|---|---|---|---|
Treatments | Sample time | 77 K | 35 K | 12 K | 5 K | 77 K/5 K | 35 K/5 K | 12 K/5 K |
Initial soil | 57.7 (2.2) | 66.8 (2.1) | 70.6 (2.4) | 76.4 (3.2) | 0.75 | 0.87 | 0.92 | |
Added 57Fe | ||||||||
57FeII−only addition | Prior to oxic (1 d) | 8.1 (0.9) | 11.4 (1.0) | 29.2 (1.4) | 41.2 (1.0) | 0.20 | 0.29 | 0.71 |
End of oxic (6 d) | 18.5 (2.4) | 62.4 (4.1) | 84.3 (2.8) | 0.22 | 0.74 | |||
End of anoxic (17 d) | 3.5 (0.7) | 15.3 (0.9) | 57.9 (3.1) | 79.1 (1.0) | 0.04 | 0.20 | 0.74 | |
End of 2nd oxic (22 d) | 14.7 (1.7) | 20.8 (1.3) | 65.7 (1.9) | 85.6 (2.0) | 0.17 | 0.24 | 0.77 | |
57FeII and 13C-DOM addition | Prior to oxic (1 d) | 6.2 (0.8) | 8.7 (0.7) | 16.0 (1.1) | 34.7 (1.9) | 0.18 | 0.25 | 0.46 |
End of oxic (6 d) | 13.1 (0.8) | 36.7 (2.8) | 74.0 (3.4) | 0.18 | 0.49 | |||
End of anoxic (17 d) | 5.2 (0.7) | 7.9 (0.6) | 21.0 (1.0) | 42.0 (3.1) | 0.12 | 0.19 | 0.50 | |
End of 2nd oxic (22 d) | 11.7 (0.9) | 15.7 (1.0) | 48.3 (3.4) | 77.8 (2.4) | 0.15 | 0.20 | 0.62 | |
