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Effects of Controlled Drainage on TN and TP Concentration in Surface Runoff

机译：受控排水对地表径流总氮和总磷浓度的影响

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摘要

This study was conducted to determine a surface runoff controlled drainage which reduced nitrogen and phosphorus losses from arable land.A field experimental project in flat topography was set up in southern China Jiangsu Province to monitor the concentration of nitrogen and phosphorus in the surface runoff.When cropland is covered with surface water caused by heavy rain,controlled drainage made it possible to reduce concentration of nitrogen and phosphorus by making surface water stay in the cropland for period of time.The surface runoff controlled drainage reduced drain flow by 12.7% compared with non-controlled drainage.The concentration of total nitrogen(TN) in non-controlled drainage is 10.55mg/L,only 5.1mg/L in controlled drainage.The concentration of total phosphor(TP) in non-controlled drainage is 8.48mg/L,only 4.4mg/L in controlled drainage.The loss of TN in non-controlled drainage is 516.7mg/m2,only 222mg/m2 in controlled drainage.The loss of TP in non-controlled drainage is 413.8mg/m2,only 191.6mg/m2 in controlled drainage.
机译：这项研究旨在确定可减少耕地中氮和磷流失的地表径流控制排水。在中国南方江苏省建立了平坦地形的野外实验项目，以监测地表径流中氮和磷的浓度。农田被大雨引起的地表水覆盖，通过控制排水，可以使表层水留在农田中一段时间​​来降低氮和磷的浓度。与非灌溉地表径流相比，地表径流控制的排水量减少了12.7％。控制排水。非控制排水中总氮（TN）的浓度为10.55mg / L，控制排水中仅为5.1mg / L。非控制排水中的总磷（TP）浓度为8.48mg / L ，控制排水中只有4.4mg / L。非控制排水中TN的损失为516.7mg / m2，控制排水中TN的损失仅为222mg / m2。 413.8mg / m2，在受控排水条件下只有191.6mg / m2。

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