中文摘要：

通过模拟降雨试验,研究不同植被格局下径流总磷的流失特征。结果表明,径流总磷流失量在产流初期仅0.5 mg,随着降雨历时的增加,流失量呈现出波动上升的趋势。累积径流量与累积径流总磷流失量具有良好的线性关系,判定系数都在98.5%以上。植被覆盖对径流养分具有削减作用,覆盖面积越大,单位径流所能携带的养分流失量越小。对于不同植被覆盖面积,坡下格局3 m2的径流总磷流失量仅为1 m2的30%,坡中和坡上格局都在50%以上。研究结果为调控坡面径流养分,削减汇入水体养分量,采用植被措施布设空间格局来治理农业非点源污染提供一定的科学依据。

英文摘要：

Based on a simulated rainfall experiments,the phosphorus loss character under the different vegetation pattern were studied.The results show that the total phosphorus loss carried by surface flow only 0.5 mg at the initial time producing runoff,then wavelike rises with rainfall duration.Cumulative total phosphorus linearity increase with cumulative slope runoff increase,the correlation coefficient was more than 0.985.The phosphorus loss of per runoff volume decrease with plant cover areas increase,it is showed that the different vegetation pattern could minify the runoff nutrient.And the total phosphorus loss is 30% of 1 m2 plant cover areas,when the area of 3 m2 at the toe of slope,while it is more than 50% at middle slope and upslope site.The result provide a certain scientific basis to regulate the runoff nutrient of slope,minify the nutrient which entering a water,and also useful for the non-point pollution treatment through the vegetation measures.