Abstract:

      A soil leaching column experiment has been designed to investigate the release of Pb from paddy-soil in suburb of Hefei City under the influence of simulated acid rain.Compared with pH=5.6 rain, pH=3.0 and pH=4.5 acid rains were studied.Under leaching similar to 1,980 mm rainfall in the experiment, the release of Pb from the paddy-soil increases with the increasing of the acid rain strength.Promoting the release of Pb can be due to the enhancement of the phosphate quantity increased.The release amount of Pb differs with soil types.The leaching effect is more remarkable for soil sample from Daxing area than that from Yicheng area.

Key words: acid rain, paddy-soil, phosphorus, leachate