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氮、磷在水-土界面会发生复杂的迁移转化作用,了解集水区氮、磷的迁移流失特征,对区域面源污染的治理意义重大。本研究通过在毛竹(Phyllostachys edulis)林地设置径流小区5个(5 m×20 m),于2012年5月—2013年10月定期采集径流水样测试,分析了浙北安吉赋石水库集水区毛竹林地表径流氮、磷的流失特征。结果表明:观测到16次地表径流事件中,各径流小区径流水量差别较大,最大为0.98 m3;其中氮是主要的流失元素,硝态氮(NO3--N)、铵态氮(NH4+-N)、总氮(TN)和总磷(TP)浓度分别在0.039~1.017、0.039~2.547、2.069~5.393和0.020~1.205 mg·L-1,其浓度受降雨量和径流水量影响较大;用二次函数可以较好地拟合氮、磷流失量与径流水量之间的相关关系,由于台风“菲特”的影响,2012年10月12日径流水量达到最大值,平均为0.81 m3,TN和TP的流失量分别为2.300和1.716 g。本研究表明,在植物非生长季和暴雨时期,该集水区毛竹林氮、磷随径流流失风险大,对赋石水库水体富营养化形成潜在压力。
Nitrogen and phosphorus will undergo complex migration and transformation at the water-soil interface. Understanding the migration and loss characteristics of nitrogen and phosphorus in catchment areas is of great significance to the management of regional non-point source pollution. In this study, five runoff plots (5 m × 20 m) were set up in Phyllostachys edulis forests and runoff water samples were collected periodically from May 2012 to October 2013. The water quality of the Anji Fushi Reservoir Characteristics of Nitrogen and Phosphorus Loss from Surface Runoff of Moso Bamboo Forest in. The results showed that in the 16 surface runoff events, the runoff volume of each runoff plot varied greatly, with a maximum of 0.98 m3. Among them, nitrogen was the main drainage element, nitrate nitrogen (NO3 - N), ammonium nitrogen (NH4 + N, TN and TP were 0.039 ~ 1.017, 0.039 ~ 2.547, 2.069 ~ 5.393 and 0.020 ~ 1.205 mg · L-1, respectively. The concentrations of total nitrogen and total phosphorus (TP) The quadratic function can well fit the correlation between nitrogen and phosphorus loss and runoff. Due to the influence of typhoon “Fite”, the runoff volume reached the maximum on October 12, 2012, with an average of 0.81 m3 TN and TP lost 2.300 and 1.716 g, respectively. This study shows that under the non-growing season and the heavy rain period, the nitrogen and phosphorus in Moso bamboo forest in this catchment have a high risk of runoff loss, which may cause potential pressure on the eutrophication of the water body in the Yushi reservoir.