Ammonia nitrate and nitrite The available inorganic N at
CO2 [CO2Biochar = 0.944 (CO2control) + 11.14 μg C gsoil−1 d−1; R2 = 0.97; P < 0.001],
N2O [N2OBiochar = 0.3709 (N2Ocontrol) − 0.05 ng N g−1 d−1;R2 = 0.63; P < 0.0058], IKK-16 (IKK Inhibitor VII) and
CH4 [CH4-Biochar = 0.714 (CH4-control) − 1.02 ng C g−1 d−1; R2 = 0.90; P < 0.0001] ( Fig. 2).
Fig. 2. Observed relationships between the biochar amended and control incubations for (a) CO2, (b) N2O, and (c) CH4 production between all soil types. Error bars represent corresponding one standard deviation of the associated rates. The symbol is the location abbreviation (Table 1), MN-F: Minnesota Forest; WI-F: Wisconsin Forest; CA: California; FL: Florida; MN-A: Minnesota Agriculture; SC: South Carolina; IL: Illinois; ID: Idaho; MI: Michigan; and PA: Pennsylvania.Figure optionsDownload full-size imageDownload as PowerPoint slide