• 关键词：径流过程  氮,磷  流失

• 基金项目：

• 邬伦
• 北京大学城市与环境学系,北京 100871

• 李佩武
• 天津师范大学地理学系

• 摘要：以于桥水库流域为例,通过人工降雨模拟实验与天然降雨径流过程监测,对所获主要营养盐物质──氮、磷的监测数据进行归纳、分析、验证,得出氮、磷随径流过程的输出特征,变化趋势、共性与差异,以及主要影响因子对氮、磷流失的影响过程与原因分析,为水体富营养化的防治研究提供依据。

• Abstract：Taking the Yuqiao Reservoir area as an example,process of rainfall and flow making,the output features,changing tendency,general character and diversity of the N and P have been studied using artificial rainfall.The factors affecting the losses of N and P were investigated as well.The output concentration of TN,solutive N, TP,solutive P decreases during the process of runoff.TN,TP,and the quantity of runoff correlate positively with the soil erosion.In most cases, the descending rule of the output concentration shows as a parabolic curve,and the decreasing rate is high. The output concentration of solutive N shows linear distribution; the output concentration of solutive P shows non-linear distribution. The output rate of N, P decreases during the process of runoff,and it's curve shows deviation distribution, Cs>0.Since the output quantity of N,P increases while rainfall intensity increases,the stronger rainfall intensity will cause more serious erosion, that is, N,P will bleed with large quantity. The quantity of N, P bleeding shows"more in basin than in hill,more in hill than in mountaini"in each experiment sample with different plants.So soil parent material,soil N,TP,soil water protection play the leading role in N,P bleeding.

• Key words：flow-making  nitrogen  phosphorus

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