中文摘要：

稻田土壤磷（P）的淋溶和迁移受到人们的普遍关注。对水稻士施P后立即进行高强度淋洗的研究表明。施P对各处理淋出液的P浓度没有明显影响。各种形态的P淋溶到60cm土层以下的浓度不超过0．1mg／kg，折合每公顷损失P量分别为可溶活性P约1．2—1．4kg。非活性P为1．2—1．6kg，全P为2.5～2．8k，对地下水影响小。施P量低于400kg／hm^2时，施入的P没有移出上层土壤：当施P量高于800kg／hm^2时，P从上层向下移动现象明显；施P量超过1600kg／hm^2后，移动距离可达10cm。并预测出上层土壤可能发生P的移动和淋溶的土壤Olsen-P闽值为74．1mg／kg，超过该值发生P移动和淋溶的可能性增加。

英文摘要：

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/hm^2 of dissolved reactive phosphorus （DRP）, 1.2 - 1.6 kg/hm^2 of unreactive phosphorus （UP） and 2.5 - 2.8 kg/hm^2 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/hm^2, but an obvious P transport was found as P applied amount above 800 kg/hm^2, which could reach 10 cm when P applied amount above 1600 kg/hm^2; 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.