P leaching and transport in paddy soil has been a public concern for a long time. A lab leaching experiment was conducted to study P leaching and vertical transport in paddy soil after P was applied to tested paddy soil. Results showed no significant influence of P application on P concentration in leached-water samples obtained by 60 cm high soil-filling lysimeters in different treatments; P concentrations of different fractions of leached-water samples were all less than 0.1 mg/L, equal to 1.2~1.4 kg/hm2 of dissolved reactive phosphorus (DRP), 1.2~1.6 kg/hm2 of unreactive phosphorus (UP) and 2.5~2.8 kg/hm2 of total phosphorus (TP) lost from tested soil, respectively, thus, could influence little on groundwater; P did not transport to subsoil as P applied amount less than 400 kg/hm2, but an obvious P transport was found as P applied amount above 800 kg/hm2, which could reach 10 cm when P applied amount above 1600 kg/hm2; 74.1 mg/kg was forecasted as threshold of Olsen-P in top soil to leach and transport to subsoil, and possibility of P leaching and transport would increase if P concentration beyond it.
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周全来,赵牧秋,鲁彩艳,史奕,陈欣.磷在稻田土壤中的淋溶和迁移模拟研究[J].土壤,2006,38(6):734-739. ZHOU Quan-lai, ZHAO Mu-qiu, LU Cai-yan, SHI Yi, CHEN Xin. Simulation of Leaching and Transport of P in Paddy Soil[J]. Soils,2006,38(6):734-739