EFFECTS OF MINE WATER IRRIGATION ON VERTICAL DISTRIBUTION OF SOIL NUTRIENTS, SALTS AND METALS

. In North China, the shortage of water resources is one of the main restricting factors of agricultural production. In order to alleviate the two problems of agricultural water shortage and mine water discharge and promote the safe utilization of mine water resources. In this paper, the soil column test was used to study the effects of different models of mine water irrigation on the vertical distribution of soil nutrients, salinity and metals. The results show that mine water irrigation can improve soil fertility, and increase the risk of soil and groundwater pollution; mine water irrigation can increase soil salinity, the contents of K + , Na + , Ca 2+ , Mg 2+ , Cl - and SO 4 2-increased significantly in 0-10 cm and 60-80 cm soil layers, which did not cause soil salinization and alkalization in a short time, and the pH value of soil was not affected by irrigation water quality; mine water irrigation increased the concentrations of Cd and Pb in soil, which accumulated most obviously in 0-20 cm soil layer, which caused soil Cd exceeding the secondary soil environmental standard (Cd = 1.00 mg·kg -1 ); the mixed irrigation (mine water and clean water) and rotational irrigation could reduce the pollution risk of nitrogen of groundwater, soil salinization, alkalization, Cd and Pb metals.