  We investigate Abelian and monopole contributions to spatial string tension
in the deconfined phase of finite temperature SU(2) gauge theory without
imposing any gauge fixing conditions. Lattice calculations of non-Abelian and
Abelian spatial string tensions from the Wilson action at gauge coupling
$\beta=2.74$ and lattice volume $24^3\times{N_t}$ $(N_{t}=\left\{
24,8,6,4,2)\right\}$ show that these string tensions agree with each other
within error bars at any adopted value of $N_t$, which implies Abelian
dominance. From measurements of non-Abelian, Abelian, and monopole forces that
arise from the corresponding spatial string tension, furthermore, we find the
tendency that the monopole contribution to the spatial string tension can be
almost as large as the non-Abelian and Abelian ones. The temperature dependence
of the calculated non-Abelian and Abelian spatial string tensions allows us to
conclude that the concept of dimensional reduction holds both for non-Abelian
and Abelian sectors at temperatures higher than twice the critical temperature.
