摘要
利用长江河口潮区界大通站的水质资料探讨了溶解态无机氮、磷浓度和通量的变化。结果表明 :NO-3、NH+4、DIN的浓度随季节变化不明显 ,而NO-2 、PO3-4的浓度是枯季较高、洪季较低 ;1963～ 1984年间 ,NO-3、NO-2 、NH+4、DIN和PO3-4的年平均浓度分别为 17.1、0 .4 3、7.1、2 4 .7、0 .19μmol/L ,平均通量分别为 3 3 .1、0 .5 1、3 .67、10 .5和 0 .5 4kg/s ,平均年通量分别为 10 4 .4 4、1.61、11.5 6、3 3 .1和 1.70万t;溶解态无机氮、磷的通量由于受到流量的影响而在年内分配不均匀 ,其中NO-3、NO-2 、NH+4、DIN和PO3-4在洪季的通量分别为全年的 72 .9%、5 8.1%、69.2 %、71%和 68.3 % ;NO-3、NO-2 、DIN年通量的总变化趋势是稳步上升 ,且与氮肥使用量成高度显著的正线性相关。1998年 ,NO-3、NO-2 、NH+4和PO3-4的年通量分别为 4 77.3、1.3 5 6、3 .0 97和 2 .2 96万t。
Based on the data of water quality at Datong Station, which is at tidal limit in the Changjiang Estuary, variations of concentrations and fluxes of the dissolved inorganic nitrogen and phosphorus were discussed.The concentrations of NO\+-\-3, NH\++\-4 and DIN varied little with seasons, but the concentration of NO\+-\-2 and PO\+\{3-\}\-4 were a little higher in the flood season and lower in the dry season. The average annual concentrations of NO\+-\-3, NO\+-\-2, NH\++\-4, DIN and PO\+\{3-\}\-4 were 17.1, 0.43, 7.1, 24.7, 0.19 μmol/L, respectively. The average fluxes of NO\+-\-3, NO\+-\-2, NH\++\-4, DIN and PO\+\{3-\}\-4 were 33.1,0.51, 3.67, 10.5 and 0.54 kg/s, respectively. The average annual fluxes of NO\+-\-3, NO\+-\-2, NH\++\-4, DIN and PO\+\{3-\}\-4 were 1 044.4,16.1,115.6,331 and 17.0 thousand tons, respectively. The fluxes of the dissolved inorganic nitrogen and phosphorus were not uniformly throughout the year due to the runoff. The fluxes of NO\+-\-3, NO\+-\-2, NH\++\-4, DIN and PO\+\{3-\}\-4 in the flood season accounted for 72.9%,58.1%,69.2%,71% and 68.3% of the average annual fluxes, respectively. The annual fluxes of NO\+-\-3, NO\+-\-2 and DIN increased continuously and were well correlated to chemical fertilizer. In 1998, the fluxes of NO\+-\-3, NO\+-\-2, NH\++\-4 and PO\+\{3-\}\-4 were 4 773,13.56,30.97 and 22.96 thousand tons, respectively.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2002年第1期64-68,共5页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金资助项目 (编号 :497362 2 0 )
