淹水过程不同土层磷的释放研究

recirculating flume simulated experiment was carried out to estimate phosphorus release properties and infection in different layers of flooded soils. The results showed that p released from flooding soils present indented alternation ,but the liberative quantity showed great difference between different soil layers; The characteristic is that the quantity in middle-level is the least and it showed higher in superstratum and substrate which the maximum of phosphorus concentration is 0.0336 mg/L and 0.0517 mg/L for each other; however, the released quantity of ferrous and the all iron present reverse to the quantity of phosphor. The characteristic is that the quantity in middle-level is the biggest and the superstratum takes the second place, the substrate is the least. Also we find that the released quantity of middle-level is more than superstratum and substrate in evidence. The pH value in the soil solution approached seven along with inundation period, which was not propitious to p release; Flooding urged Eh value to descend and the descendant range is the biggest in middle-level. At a certain extent, p release in flooding soils was affected by ferric oxide-hydroxide, such as water iron ore formed by hydrolyzing or oxidation and blueness iron ore; Moreover, flooding enhanced p diffuse capacity that a mass of p cumulated in groundwater.