  Kinetic equations are used to study thermalization of the anisotropic
quark-gluon plasma produced by decays of color flux tubes possibly created at
the very early stages of relativistic heavy-ion collisions. The decay rates of
the initial color tubes are given by the Schwinger formula, while the collision
terms are taken in the relaxation-time approximation. By connecting the
relaxation time with viscosity we analyze production and thermalization
processes in the plasma characterized by different values of the ratio of the
shear viscosity to entropy density.
