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首页> 外文期刊>Marine Chemistry >Dissolved organic phosphorus in the Mississippi River plume during spring and fall 2002
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Dissolved organic phosphorus in the Mississippi River plume during spring and fall 2002

机译：2002年春季和秋季在密西西比河羽流中溶解的有机磷

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Dissolved organic phosphorus (DOP) may play an important role in controlling primary productivity in coastal systems. In an attempt to understand the controls on seasonal and spatial variability in the Mississippi River plume, DOP samples were collected during spring and fall 2002. DOP concentrations were determined using an autoanalyzer with in-line thermal/UV oxidation. For both seasons, DOP concentrations were highest in the river and decreased with distance from the river. Salinity, chlorophyll a, dissolved organic carbon and nitrogen are parameters which have been shown to correlate with DOP in other systems. Within the Mississippi River plume, no correlation was found between DOP and any of these parameters, and less than 5% of the total dissolved phosphorus was high molecular weight, as separated by tangential flow ultrafiltration. Our results suggest that DOP may cycle quickly in the plume and be a source of inorganic phosphorus in the late summer, leading to seasonal changes in the inorganic N/P ratio and potentially a shift in the planktonic community.
机译：溶解有机磷（DOP）可能在控制沿海系统的初级生产力中起重要作用。为了了解密西西比河羽流中季节性和空间变化的控制，在2002年春季和秋季收集了DOP样品。使用带有在线热/ UV氧化的自动分析仪确定DOP浓度。对于两个季节，DOP浓度在河流中最高，并且随着距河流的距离而降低。盐度，叶绿素a，溶解的有机碳和氮是已显示与其他系统中DOP相关的参数。在密西西比河羽流中，DOP与这些参数中的任何一个之间均未发现相关性，并且通过切向流超滤法分离的总溶解磷中，不到5％的高分子量。我们的结果表明，DOP可能在羽流中快速循环，并在夏末成为无机磷的来源，从而导致无机N / P比的季节性变化，并可能导致浮游生物群落发生变化。

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