  We are interested in the long time asymptotic behavoir of solutions to the
scalar Zakharov system \[ i u_{t} + \Delta u = nu,\] \[n_{tt} - \Delta n=
\Delta |u|^2\] and the Klein-Gordon Zakharov system \[ u_{tt} - \Delta u + u =
- nu,\] \[ n_{tt} - \Delta n= \Delta |u|^2\] in one dimension of space. For
these two systems, we give two results proving decay of solutions for initial
data in the energy space. The first result deals with decay over compact
intervals asuming smallness and parity conditions ($u$ odd). The second result
proves decay in far field regions along curves for solutions whose growth can
be dominated by an increasing $C^1$ function. No smallness condition is needed
to prove this last result for the Zakharov system. We argue relying on the use
of suitable virial identities appropiate for the equations and follow the
technics of Kowalczyk-Martel-Mu\~noz and Mu\~noz-Ponce-Saut.
