The results showed that soil nitrogen leaching\'s main components is soil nitrate nitrogen,soil nitrate nitrogen leaching and rainfall,irrigation,fertilization amount was positive correlation,soil nitrate nitrogen leaching is less in slope land.

Aiming at the possible environmental impacts during mine-fill with the coal gangues from Yanma mine,two dynamic leach experiments were designed under simulation conditions in laboratory for analyzing the control effects: one is to mix coal gangues with clay uniformly,another is to fill the coal gangues and clay into layers seperately.

The release and leaching characteristics of N, P and K from sewage sludge applied to red soil were studied by field experiment and indoor incubation as affected by type, application method and rates of sewage sludge.

A lot of industrial solid wastes are brought in karst mountain area every year,these industrial solid wastes arose the secondary water pollution because of rain leaching and the others reason while they are deposited in there,and the secondary water pollution influences surface and ground water environment.