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We have investigated the analytical forms of the photonic density of states(DOS)in a photonic crystal in the interested frequency regime according to the rule of state conservation in a photonic crystal with pseudogaps,which states that,if a valley of the DOS appears in some range of frequencies,it must be compensated for by increasing over some other ranges.By using a model DOS with a state-conservative photonic pseudogap,we have also investigated the enhancement and suppression of spontaneous emission of two-level atoms with different frequency positions and widths of emission spectra in a state-conservative electromagnetic reservoir; and the DOS-induced suppression,enhancement,narrowing and redshifting or blueshifting of spontaneous emission spectra are naturally obtained.