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Dirac states hosted by Sb/Bi square nets are known to exist in the layeredantiferromagnetic AMnX$_2$ (A = Ca/Sr/Ba/Eu/Yb, X=Sb/Bi) material family thespace group to be P4/nmm or I4/mmm. In this paper, we present a comprehensivestudy of quantum transport behaviors, angle-resolved photoemission spectroscopy(ARPES) and first-principles calculations on SrZnSb2, a nonmagnetic analogue toAMnX2, which crystallizes in the pnma space group with distorted square nets.From the quantum oscillation measurements up to 35 T, three major frequenciesincluding F$_1$ = 103 T, F$_2$ = 127 T and F$_3$ = 160 T, are identified. Theeffective masses of the quasiparticles associated with these frequencies areextracted, namely, m*$_1$ = 0.1 m$_e$, m*$_2$ = 0.1 m$_e$ and m*$_3$ =0.09m$_e$, where m$_e$ is the free electron mass. From the three-bandLifshitz-Kosevich fit, the Berry phases accumulated along the cyclotron orbitof the quasiparticles are 0.06$\pi$, 1.2$\pi$ and 0.74$\pi$ for F$_1$, F$_2$and F$_3$, respectively. Combined with the ARPES data and the first-principlescalculations, we reveal that F2 and F3 are associated with the two nontrivialFermi pockets at the Brillouin zone edge while F1 is associated with thetrivial Fermi pocket at the zone center. In addition, the first-principlescalculations further suggest the existence of Dirac nodal line in the bandstructure of SrZnSb$_2$.

Non-trivial topology in a layered Dirac nodal-line semimetal candidate SrZnSb$_2$ with distorted Sb square nets