  A theoretical approach to the influence of one-dimensional lattice
fluctuations on electronic properties in weakly localized spin-Peierls systems
is proposed using the renormalization group and the functional integral
techniques. The interplay between the renormalization group flow of correlated
electrons and one-dimensional lattice fluctuations is taken into account by the
one-dimensional functional integral method in the adiabatic limit. Calculations
of spin-Peierls precursor effects on response functions are carried out
explicitely and the prediction for the temperature dependent magnetic
susceptibility and nuclear relaxation is compared with available experimental
data for (TMTTF)$_{2}$PF$_{6}$.
