Abstract：On-site monitoring, mass balance, correlation analysis and other tools were adopted to investigate the correlation between water distribution and rainfall/soil factors, and then determine the partition coefficients between water and TN pollution load removal at three typical vegetation buffers. The results showed that runoff at outlet of strips was highly positively correlated with rainfall depth (0.980~0.987, P<0.01), and seepage was significantly positively correlated with rainfall depth and rainfall duration (0.595~0.828, P<0.01). The average runoff coefficients under moderate rain, heavy rain and storm were 0.10, 0.36 and 0.72, and the average interception coefficients of TN load were 11.0, 8.2 and 4.5mg/(m2·mm) respectively. The removal effects of runoff and TN load decreased with the increase of rainfall depth. Under moderate-heavy rain and storm, the water distribution of vegetation buffer strips was mainly characterized with seepage (coefficient: 0.48~0.71) and runoff at outlet (coefficient: 0.69~0.74). The TN load removal by vegetation buffer strips under moderate rain, heavy rain and rainstorm was mainly characterized with soil infiltration, accounting for 56%, 44% and 20% of the inflow-load respectively. The vegetation with stems and leaves covering the ground and fine roots had better effect on water and pollution removal for Farmland Runoff and its pollution. The buffer strips planted with Cynodon dactylon had the best removal effect on water and Trifolium repens L had the best removal effect on TN load, up to 60% and 61% respectively. Even in the plain river network area with high groundwater level, the soil infiltration of vegetation buffer strips still greatly contributes to the runoff and TN load reduction, especially in the areas with high frequency of rainfall less than 50mm. The results provided data support for the differential evaluation of runoff pollution reduction under the influence of rainfall and vegetation, and worth referencing for the control of runoff pollution by buffer strips under different rainfall characteristics.
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