3.6 | Fertilisation effect
Our second objective was to assess the effect of fertilisation on GPP.
Using the annual sums, neither GPPiso/SF nor
GPPPRELES was significantly different between the F and
the R plots (Figure 6). However, there were consistent trends;
GPPiso/SF was higher by 10% in the F plot than in the R
plot and GPPPRELES was higher by 16% (Figure 6). Using
the daily data corrected for autocorrelation, we found a significant
increase in the F plot; GPPiso/SF was higher by 8% and
GPPPRELES was higher by 16% (Figure 7, Table 2 and see
Figure S5 for others assumptions).