Dissolved Inorganic Nitrogen Changes in Upper Reaches of Daling River in China
Data from 3 monitoring stations in the upper reaches of the Daling River from 1985 to 2007 reveal an obvious increasing trend in the concentrations of NH4-N, NO2-N and NO3-N. The average annual concentrations of NH4-N, NO2-N and NO3-N increased from 0.69 mgL-1，0.006mgL-1，1.14 mgL-1 in 1985 to 3.01 mgL-1，0.210 mgL-1，6.57 mgL-1 in 2007. The highest concentrations of NH4-N, NO2-N and NO3-N during past 20 years were found in the Habaqi station, being 18.00mgL-1， 3.230mgL-1，16.30mgL-1. The highest concentrations of NH4-N, NO2-N and NO3-N of each station occurred mostly in dry season. With the increasing flow in the upper reaches of the Daling River, the concentrations of NH4-N, NO2-N and NO3-N decreased except NH4-N and NO2-N increased in the Chaoyang station.
Huixiu Wu Cuiling Jiang Zhong Du
College of Hydrology and Water Resources Hohai University Nanjing 210098, P.R.China
国际会议
成都
英文
1-4
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）