  A QCD based effective action is constructed to describe the dynamics of
confinement and symmetry breaking in the process of parton-hadron conversion.
The deconfined quark and gluon degrees of freedom of the perturbative QCD
vacuum are coupled to color singlet collective fields representing the
non-perturbative vacuum with broken scale and chiral symmetry. The effective
action recovers QCD with its scale and chiral symmetry properties at short
space-time distances, but yields at large distances (r > 1 fm) to the formation
of symmetry breaking gluon and quark condensates. The approach is applied to
the evolution of a fragmenting $q\bar q$ pair with its generated gluon
distribution, starting from a large hard scale $Q^2$. The modification of the
gluon distribution arising from the coupling to the non-perturbative collective
field results eventually in a complete condensation of gluons. Color flux tube
configurations of the gluons in between the $q\bar q$ pair are obtained as
solutions of the equations of motion. With reasonable parameter choice, the
associated energy per unit length (string tension) comes out $\simeq 1$ GeV/fm,
consistent with common estimates.
