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Femtosecond dynamics of resonantly excited surface plasmons in one-dimensional plasmonic crystals is observed by using frequency-resolved optical gating (FROG). The FROG spectrograms differs significantly for both edges of plasmonic band gap due to strong spectral variation of surface plasmon lifetime within Fano resonances. The asymmetric plasmon-assisted reshaping of the electric field amplitude and phase of the femtosecond pulses is demonstrated.