文章摘要
杨小林,朱波,董玉龙,花可可.紫色土丘陵区小流域非点源氮迁移特征研究[J].水利学报,2013,44(3):
紫色土丘陵区小流域非点源氮迁移特征研究
Transport processes of diffuse nitrogen in typical catchmentsin the hilly area of purple soil
  
DOI：
中文关键词: 集镇小流域  农林复合小流域  次降雨事件  氮迁移  浓度变化  负荷分布
英文关键词: residential catchment  agroforestry catchment  typical rainfall event  nitrogen transport  concentration variation  loading distribution
基金项目:
作者单位
杨小林 1. 中国科学院成都山地灾害与环境研究所，四川成都610041；2. 河南理工大学，河南焦作454003；3. 中国科学院研究生院，北京100039 
朱波 中国科学院成都山地灾害与环境研究所，四川成都610041 
董玉龙 黄河水利委员会三门峡水文局，河南三门峡472000 
花可可 1. 中国科学院成都山地灾害与环境研究所，四川成都610041；3. 中国科学院研究生院，北京100039 
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中文摘要:
      对紫色土丘陵区典型集镇小流域和农林复合小流域非点源氮迁移过程进行同步监测，比较2种不同类型小流域的径流过程及径流中各形态氮素浓度、负荷变化特征。结果表明：（1）集镇小流域径流过程与降雨过程迅速响应，径流过程呈现“暴涨暴落”的特点，而农林复合小流域径流过程显著滞后于降雨过程，呈现显著的“滞后效应”。（2）集镇小流域总氮（TN）、颗粒态氮（PN）及铵态氮（AN）浓度在径流初期迅速升高，达到“峰”值后迅速下降；而农林复合小流域在小雨事件中氮浓度变化较小，中雨和暴雨事件过程中，初期径流氮浓度较低，中后期逐渐升高，
英文摘要:
      The control of diffuse pollution requires information on the transport processes of those pollutants within catchments. In this study， the characteristics of diffuse nitrogen discharged from residential catchment and agroforestry catchment in the hilly area of the central Sichuan Basin，China，are reported. Hydrological processes and hydrochemical processes of nitrogen during 3 typical rainfall events were monitored synchronously at both monitoring sites. The results show that great variations were observed for hydrological processes and nitrogen transport processes between residential catchment and agroforestry catchment：（1） Hydrologically， the results demonstrated that the occurrence and the peak discharge of runoff responded more rapidly to the rainfall in the residential area due to the high percentage of impervious area， whereas the agroforestry catchment with a high percentage of permeable area showed a slower flow recession；（2） The concentrations of TN， PN and AN in residential catchment were very high in the early stage of the rainfall events，followed by a rapid decrease. In contrast，the concentrations of nitrogen showed a relatively slight change throughout the course of the small rainfall events in agroforestry catchment and peak concentrations of TN， DN and NN were generally observed in the“end” stages of duration during the medium and heavy rainfall events；（3） Significant“first flush”were observed for TN，PN，AN in residential catchment， and the transport processes of TN， DN， NN in agroforestry catchment demonstrated slight effect of the“end flush”.
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