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了解水文过程对研究径流污染物的输出规律及控制农业非点源污染有重要意义。以张家港海芸枇杷林试验区为依托,监测自然降雨条件下研究区出口径流和地下水中的氮素浓度,研究了太湖流域典型旱地总氮(TN)、硝态氮(NO-3-N)、铵态氮(NH+4-N)流失的特征。结果表明,硝态氮是氮素流失的主要形式,占氮流失总量的90.1%;径流初期氮素浓度迅速升高,之后随径流增大逐渐降低,径流退水阶段壤中流携带土壤中硝态氮补给地表流,氮素浓度回升;氮素输出浓度随降雨强度的增强而升高。
Understanding of hydrological processes is of great importance to studying the law of output of runoff pollutants and controlling agricultural non-point source pollution. Based on the experimental area of loquat forest in Zhangjiagang, the nitrogen concentration in outlet runoff and groundwater under natural rainfall conditions was monitored. The effects of total nitrogen (TN), nitrate nitrogen (NO 3 -N) , Ammonium nitrogen (NH + 4-N) loss characteristics. The results showed that nitrate nitrogen was the main form of nitrogen loss, accounting for 90.1% of the total nitrogen loss. The nitrogen concentration increased rapidly at the initial runoff and then decreased with the increase of runoff. Nitrogen supplies recharge the surface flow, and the nitrogen concentration rises; the nitrogen output concentration increases with the increase of rainfall intensity.