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Effects of Rainfall Intensity and Amount on the Transport of Total Nitrogen and Phosphorus in a Small Agricultural Watershed

Precipitation-runoff partitioning of small basins plays an important role in the non-point pollution study. This study analyzes the contribution of precipitation and rainfall intensity in a basin scale to pollutants(e.g. nitrogen, phosphorus) migration by monitoring rainfall and runoff responses in Meilin watershed. According to the field data, the concentration of nitrogen keeps an increasing trend with the increase of rainfall amount, while phosphorus seems not so evident. Intense rainfall has a fierce scouring effect on the pollutants which have a large using amount such as total nitrogen in the steep experimental field, thus leading to a sudden decrease of pollutant concentration. After the intensity is weakened, pollutant concentration gradually goes up due to the dissolving effect of runoff.