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Within a quark combination model, we study systematically the yields andrapidity spectra of various hadrons in central Au+Au collisions at$\sqrt{s_{NN}}= 200$ GeV. We find that considering the difference in rapiditybetween net-quarks and newborn quarks, the data of multiplicities, rapiditydistributions for $\pi^{\pm}$, $K^{\pm}$, $p(\bar{p})$ and, in particular theratios of charged antihadron to hadron as a function of rapidity, can be welldescribed. The effect of net-quarks on various hadrons is analysed, and therapidity distributions for $K^{0}_{s}$, $\Lambda(\bar{\Lambda})$,$\Sigma^{+}(\bar{\Sigma}^{_-})$, $\mathrm{\Xi^{-}}$ ($\mathrm{\bar{\Xi}^{_+}}$)and $\mathrm{\Omega^{-}}(\mathrm{\bar{\Omega}}^{_+})$ are predicted. We discussthe rapidity distribution of net-baryon, and find that it reflects exactly theenergy loss of colliding nuclei.

The influence of net-quarks on the yields and rapidity spectra of identified hadrons