The results of simulations under the emission scenarios A2 and
B2 with the two GCMs in terms of SOC (t C ha1) and changes of
SOC (t C ha1 yr1) are shown in Tables 3 and 4. A graphical example
is given in Fig. 3 for the GISS A2 scenario.
In the more intensive land uses, i.e. tilled vineyard (TV) and no
tilled grassed vineyard (GV), a sharp SOC decrease between 8.3 and
13.6 t C ha1 was observed after 90 yr compared with the baseline
values in 2007, even with no changes in land management, soil
carbon inputs or crop yields.
In the other land uses there was always an increase of SOC compared
with the 2007 baseline. In the hay crop (HC) SOC increased
by 2.8–4.7 t C ha1; in the pasture (PA) by 2.3–2.9 t C ha1; in the
semi-natural systems (SN) by 3.8–4.2 t C ha1; and in the cork
oak forest (CO) by 1.6–2.1 t C ha1.