Agriculture Reference
In-Depth Information
Figure 12.6
. Cumulative fluxes of greenhouse gases from Conservation Reserve Program
(CRP) grasslands converted to no-till soybean crops. A) Average cumulative net ecosystem
productivity (NEP) during 2009 for the CRP reference field (top solid line) and converted
field (bottom dashed line). Positive values indicate net CO
2
sequestration. Shaded area rep-
resents the standard deviation of cumulative NEP. B) Average net cumulative fluxes of N
2
O
(circles) and CH
4
(squares) at the study sites over the same period. Error bars represent stan-
dard errors (n = 3 replicate fields for CRP converted and n = 4 replicates within one field for
CRP reference). Redrawn from Gelfand et al. (2011).
