  We present a physical construction of degenerate groundstates of the
Moore-Read Pfaffian states, which exhibits non-Abelian statistics, on general
Riemann surface with genus g. The construction is given by a generalization of
the recent argument [M.O. and T. Senthil, Phys. Rev. Lett. 96, 060601 (2006)]
which relates fraction- alization and topological order. The nontrivial
groundstate degeneracy obtained by Read and Green [Phys. Rev. B 61, 10267
(2000)] based on differential geometry is reproduced exactly. Some restrictions
on the statistics, due to the fractional charge of the quasiparticle are also
discussed. Furthermore, the groundstate degeneracy of the p+ip superconductor
in two dimensions, which is closely related to the Pfaffian states, is
discussed with a similar construction.
