Abstract: Serious salinization often occurs in aquaculture ponds. To ensure the effective utilization of land and water resources, the leaching dynamics of soil salinity in aquaculture ponds in Jiaozhou Bay was examined with indoor soil column experiment. Another aim of our experiment was to explore the optimum water consumption. The results showed that the salt content of soil and its leaching solution exponentially decreased with the increases of leaching water volume. Taking the leaching effect and water saving into account, the 1∶1 ratio of water and soil couldachieve better improvement effect. In the process of desalting, the concentrations of Ca²⁺, Mg²⁺, K⁺, Na⁺, and Cl^- in soils decreased, the concentration of SO₄^2- first increased and then decreased, but the concentration of CO₃^2- and HCO₃^- showed an upward trend. The concentration of each salt ion in leaching solution was similar to that of soil salt ion. The desalination rates of soil salt ions were in order of Cl^->Na⁺>K⁺>Ca²⁺>Mg²⁺>SO₄^2->HCO₃^-. With the increases ofleaching water volume, the soil ion composition changed from Cl^- and Na⁺, to Na⁺, K⁺, and SO₄^2-, and finally to Na⁺, HCO₃^- and K⁺. More attention should be paid on the alkalizationphenomenon occurred during soil desalting.

Key words: spatiotemporal dynamics, ants, easily oxidized organic carbon, Mallotus paniculatus community