  In this paper we compute the N=1 effective low energy action for a stack of N
space-time filling D3-branes in generic type IIB Calabi-Yau orientifolds with
non-trivial background fluxes by reducing the Dirac-Born-Infeld and
Chern-Simons actions. Specifically, we determine the Kahler potential for the
excitations of the D-brane including their couplings to all bulk moduli fields.
In the effective theory, N=1 supergravity is spontaneously broken by the
presence of fluxes and we compute the induced soft supersymmetry breaking
terms. We find an interesting structure in the resulting soft terms with
generically universal soft scalar masses.
