不同季节辽河口营养盐的河口混合行为

Mixing Behavior of Nutrients in Different Seasons at Liaohe Estuary

分别于2010年4、7、11月对大辽河口水域进行了3个航次的调查,测定了水体中各形态营养盐的浓度.结果表明,各形态氮、磷浓度的季节变化明显.PO3-4-P、DOP、DTP和TP平均含量的季节分布相似:均为4月最高,11月次之,7月最低;而PP平均含量由大到小依次为11、4、7月.NO-3-N、NO-2-N的含量为7月最高,4月最低;NH+4-N、DON、PN的含量为4月最高,7月最低.4月NH+4-N为TN的主要存在形态,而7、11月NO-3-N为N的主要存在形态.NO-3-N、DIN、TN在3个季节的河口混合过程中均呈保守性;而NO-2-N、NH+4-N、DON在4、11月也是保守性的,但在7月为非保守性,在河口内部存在添加源.3个季节大辽河口水域的硅酸盐均呈现保守行为,11月平均含量最高,4月最低.

The distribution and species of nutrients in the Daliaohe Estuary were studied in April, July and November, 2010. Concentrations of nutrients displayed obviously seasonal variability in the Daliaohe Estuary. Highest concentrations of p034-P,DOP, DTP and TP were in April, and the lowest were in July. While the highest PP was in November, the lowest was in July. The contents of NO3-N and NO2-N reached the highest point in July, and the lowest was in April; however, the highest NH4＋ -N, DON and PN were in April and the lowest were in November. The main existing form of TN was NH4 -N in April, while in July and November NO3-N was the dominant. The behavior of NO3- -N,DIN and TN was conseryative in various seasons ; the behavior of N02- -N, NH4＋ -N and DON was conservative in April and November,while nonconservative in July ,which indicated the exist of the extra source in the interior of the estuary. The Si023- of the Daliaohe Estuary was conservative, with the highest average concentration in November and the lowest in April.