1 Introduction Karst topography is widespread in China (Lu et al., 1973; Lu, 1986a), but its basic features are quite different in the main karstified areas in southern and northern China (Lu, 1999, 2003). The karst development appears to differ not only in the karst geomorphological types but also in the forms of the different karst water systems. The eco-hydrological features have obviously been influenced by human activities. The eco-hydrogeology is thus of great importance to study. Th…