上海地区不同施肥方式氮磷随地表径流流失研究

选择上海宝山罗店镇具有代表性的旱地蔬菜农田生态系统,在从2004年3月到8月的近半年时间里,通过对径流及径流中侵蚀泥沙的氮磷流失情况的连续监测与实验分析,研究了旱地农田施肥与氮磷流失污染之间的关系,探讨了农田氮磷的迁移特征及环境效应,主要结果表明:随地表径流流失的总氮、总磷,流失形态以沉积相为主,大部分是当季施用的化肥,随径流排出农田的氮素中有37.7%是当季施用的氮素化肥,磷素中有26.9%是当季施用的磷素化肥。

Nitrogen and Phosphorus Loss by Surface Runoff in Farmland in Shanghai

The relationship between fertilization and N and P pollution caused by farmland nitrogen and phosphorus loss was studied and also the migration way and environmental effect of fertilization on non-irrigated farmland was investigated.In March to August of 2004,we selected a typical farmland ecosystem in Baoshan District and continuously monitored the nitrogen and phosphorus loss by surface runoff.The main results of our study were as follows: the amount of total nitrogen and total phosphorus lost from farmland by surface runoff were 32.77 and 8.1kg/hm2,respectively,among which 37.7 of N and 26.9% of P were derived from the fertilizers applied in the same season.