RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2014, Vol. 23 >> Issue (05): 686-.doi: 10.11870/cjlyzyyhj201405013

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STUDY ON THE CHARACTERISTICS OF NITROGEN AND PHOSPHORUS TRANSPORTATION THROUGH ECOLOGICAL DITCH DURING IRRIGATION AND RAINFALL

YU Hongbing1,2,XIAO Runlin2,YANG Zhijian3,ZHANG Shunan2,LIU Feng2   

  1. (1.College of Architecture and Urban Planning,Hunan City University,Yiyang 413000,China;2.Institute of Subtropical Agriculture and Ecology，Chinese Academy of Sciences,Changsha 410125,China; 3.College of Agronomy,Hunan Agricultural University,Changsha 410128,China
  • Online:2014-05-20

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Abstract:

To study the transportation characteristics of nitrogen and phosphorus through agricultural headwater ecological ditch of Jinjin River Basin in Changsha County,the seasonal changes of nitrogen and phosphorus concentration in ecological ditches during irrigationand rain period were studied.The results showed that the highest concentration of total nitrogen exported  was 270 mg/L,and ammonium and nitrate were the predominant forms; the highest concentration of total phosphorus  was 032 mg/L.After irrigation,total nitrogen and total phosphorus concentration decreased gradually.After the rainfall,total nitrogen and total phosphorus also decreased gradually.The removal rates of total nitrogen and total phosphorus in ecological ditches were 64% and 70%,respectively.The concentration of total nitrogen and total phosphorus increased first and then declined with time; total nitrogen,ammonium were at their highest in 3 d after the rainfall,and total phosphorus were at their highest in 2 d after the rainfall.The highest concentration of total nitrogen,ammonium and total phosphorus were found in winter

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