Click on image to view larger version.
Fig. 2. Comparisons of changes in soil organic carbon (SOC) and soil organic nitrogen (SON) before and after the 6-yr experimental period (1995 through 2000) at Gainesville, Florida. Total (A) soil organic carbon (SOC) and (B) soil organic nitrogen (SON) concentrations at the beginning and at the end of the experiment pooled for all CO2, temperature, and species treatments (the data plotted as 2001 were actually sampled in December 2000). Mean 6-yr gains in (C) SOC and (D) SON in plots of rhizoma perennial peanut (PP) and bahiagrass (BG) pooled for CO2 and temperature treatments. Comparison of the overall effect of two levels of carbon dioxide concentration (360 and 700 µmol mol–1, indicated by ppm, mole fraction) on gains of (E) SOC and (F) SON pooled for temperature and species treatments. Comparison of the CO2 x species interaction effects on (G) SOC and (H) SON gains pooled over temperature treatments. Comparison of the overall effect of four levels of temperature treatments on gains of (I) SOC and (J) SON pooled for CO2 and species treatments. Error bars indicate standard deviations of the means.
