  We have generalized the dynamical mean-field theory to study the doping
dependence of the crossover from antiferromagnetic to short-range order
modelled by an incommensurate spin density wave in the Hubbard model. The local
selfenergy which includes spin fluctuations gives quasiparticle weights and
spectral properties in good agreement with quantum Monte Carlo and exact
diagonalization data in two dimensions. The spectra at finite doping are
characterized by a Mott-Hubbard `gap' accompanied by a pseudogap induced by the
local spin order.
