Fig. 3: Allocation and retention of rhizodeposits (13C-enriched) and three-dimensional (3D) elemental distribution in a biochar-amended Ferralsol at 9.5 y.
From: Microspectroscopic visualization of how biochar lifts the soil organic carbon ceiling
New C retention in different belowground carbon pools from Historical+Recent (a) and Control+Recent (b) soil (n = 3). The total recovery of 13C from 13C-CO2 pulse labelling (± SE) is given for soil + root respiration, root biomass, free and occluded particulate matter, and mineral fractions 15 days after labelling each plot with 190 mg 13C-CO2 m−2. c, d Three-dimensional focused ion beam scanning electron microscopy energy dispersive spectroscopy (3D FIB-SEM-EDS) of an intact soil aggregate from a Historical+Recent biochar plot (c, 30 µm × 25 µm × 24 µm) or Control+Recent plot (d, 30 µm × 20 µm × 30 µm), showing distribution of carbon, silicon, aluminium, and iron.
