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根据黄河首次调水调沙期间(2002年7月)和2002年在黄河利津站对营养盐的月际观测结果,系统分析了2002年黄河首次调水调沙期间黄河利津站和全年溶解无机态营养盐的变化,讨论了营养盐与水情要素之间的相互关系,计算了调水调沙期间及全年营养盐入海通量,并和历史资料作了比较.结果表明,调水调沙期间NO3--N、NO2--N、NH4+-N浓度的变化范围分别为169.3~273.2、0.08~0.84、1.39~5.04μmol.dm-3,平均浓度分别为218.6、0.16、2.27μmol.dm-3;PO43--P、SiO32--Si浓度的变化范围为0.36~0.56、161.4~195.8μmol.dm-3,平均浓度分别为0.48、166.7μmol.dm-3.在调水调沙期间,NO3--N浓度与水量无显著相关性,PO43--P浓度与水沙均无显著相关性,而SiO32--Si浓度与沙量呈显著正相关.与历史资料相比,调水调沙对黄河下游溶解态无机营养盐浓度在全年的变化规律并无明显影响.但黄河首次调水调沙短短不到一个月的时间,所输送的营养盐通量便占到当年输送通量的一半左右.调水调沙对营养盐输送通量在年内的分配产生重大影响,使得黄河营养盐向河口的输送非常集中.
According to the monthly observation results of nutrients in the Yellow River Lijin station during the first water and sediment adjustment of the Yellow River in July 2002 and 2002, The change of nutrients in the state of nutrient and the relationship between the factors of the water regime and the nutrient elements were discussed, and the fluxes of nutrients into the sea during the period of water and sediment regulation were calculated and compared with the historical data. The concentrations of NO3 - N, NO2 - N and NH4 + -N varied from 169.3 to 273.2, from 0.08 to 0.84 and from 1.39 to 5.04 μmol.dm-3, respectively, with the average concentrations of 218.6, 0.16 and 2.27 μmol.dm -3, PO43 - P and SiO32 - Si in the range of 0.36 ~ 0.56,161.4 ~ 195.8μmol.dm-3 and the average concentrations were 0.48,166.7μmol.dm-3, There was no significant correlation between NO3 - N concentration and water content, PO43 - P concentration had no significant correlation with water and sediment, but SiO32 - Si concentration had a significant positive correlation with sediment concentration.Compared with historical data, There was no significant effect on the variation of dissolved inorganic nutrient concentration in the lower reaches of the Yellow River in the whole year, but the first regulation of the Yellow River water and sediment was less than a month, The nutrient fluxes transported accounted for about half of the total transport fluxes of the year, and the water and sediment transport had a significant impact on the distribution of nutrient fluxes during the year, which made the transport of nutrients to the estuary of the Yellow River very concentrated.