Particle and heat transport in a low collisional plasma confined by a partially stochastic magnetic field are analysed. We show that the particle diffusion is ambipolar. Moreover near stochastic threshold, the electron heat diffusivity chi(e) is enhanced, so that the electron and ion heat diffusivity are equal chi(e) = chi(i) approximately D square-root m(i)/m(e) (chi(i) is the ion thermal diffusivity and D the particle diffusion coefficient of both species).