但是雨水径流有明显的初期冲刷作用，污染物集中在初期的数毫米雨量中。
But the rainfall and runoff has obvious effect of flushing at the initial stage and most of pollutants just concentrate in the first few millimeters of rainfall.
此外，单位质量的小颗粒含有更多氮也在一定程度上削弱了TN的初期冲刷效应。
In addition, more nitrogen absorbed by the unit mass small particles to a certain degree weakens the first flush of TN.
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