  We show that the saturation exponent is more effective than the hard pomeron
exponent in the nonlinear terms for the GLR-MQ evolution equations. For the
gluon distribution the nonlinear terms are found to play an increasingly
important role than the singlet distribution. The nonlinear corrections for the
singlet and gluon distributions are important in a limited range of $Q^2$ and
are independent of the upward and downward evolution. This allows us to single
out the region where the nonlinear corrections may provide evidence for
recombination. We numerically study the nonlinear terms for nuclear singlet and
gluon distributions and quantify the impact of gluon recombination in a wide
range of $Q^2$. This analysis indicates that the nonlinear effects are most
pronounced for heavy nuclei and are sizable at
$2{\lesssim}Q^2{\lesssim}20~\mathrm{GeV}^2$ for light and heavy nuclei.
