Monitoring of Inorganic Nitrogen Levels in the Surface and Ground Water of the Red River Delta, Northern Vietnam
Monitoring of Inorganic Nitrogen Levels in the Surface and Ground Water of the Red River Delta, Northern Vietnam
复制标题
越南北部红河三角洲地表水和地下水中无机氮水平的监测
DOI：
10.1081/css-120038560
复制
发表时间：
2004
影响因子：
1.8
通讯作者：
K. Egashira
中科院分区：
文献类型：
--
作者：
K. Kurosawa;Do Nguyen Hai;N. Huu Thanh;Ho Thi Lam Tra;Nguyen Tat Canh;K. Egashira
摘要2002年雨季结束时，在越南北方中部红河三角洲的三个不同地形、土壤类型和种植模式的农村公社监测了地表水和地下水的铵态氮（N）、硝态氮和pH值。通过对农民的访谈，获得了有关肥料氮施用量以及牲畜饲养种类和数量的信息。农户每年平均施用的肥料氮量约为400公斤/公顷，与其他亚洲国家相比处于非常高的水平。地表水和地下水的铵态氮浓度相对较高，分别超过了越南饮用水和非饮用水标准。公社的地形对表面的铵态氮浓度的可能影响提出了建议。地表水和地下水硝态氮浓度普遍低于0.4mg/L，其中灰色退化土区硝态氮浓度高达5 mg/L，冲积土区硝态氮浓度始终低于相应点位的铵态氮浓度，表明土壤和水体中的硝化作用受到抑制。在灰色退化土壤区的一些地点测得的地下水pH值偏低，超出了越南饮用水标准。
Abstract Concentrations of ammonium-nitrogen (N) and nitrate-N and the pH of the surface and ground water were monitored in three rural communes differing in topography, soil type, and cropping pattern in the central Red River Delta, northern Vietnam, at the end of the rainy season in 2002. Information on the amount of fertilizer N applied and the kind and number of livestock feeding was obtained through interviews of the farmers. The amount of fertilizer N annually applied by a farm household was around 400 kg/ha in average and was a very high level compared to other Asian countries. The ammonium-N concentrations of the surface and ground water were relatively high and exceeded the Vietnamese water standard for purposes other than drinking use and for drinking use, respectively. Possible impacts of the topography of the communes on the ammonium-N concentration of the surface were suggested. The nitrate-N concentrations of both surface and ground water were generally lower than 0.4 mg/L with an exceptionally high value of 5 mg/L in the grey degraded soil area, and were always below the ammonium-N concentrations at the corresponding sites in the alluvial soil area, indicating the suppressed condition of nitrification in the soil and water. The low pH of the ground water measured at some sites in the grey degraded soil area was out of the Vietnamese water standard for drinking use.