荣成天鹅湖碳、氮、磷空间分布特征及其来源解析研究

Spatial Distribution Characteristics and Source Analysis of Carbon, Nitrogen and Phosphorus in the Rongcheng Swan Lake

研究荣成天鹅湖湖水与底泥中C、N、P含量的分布特征,结果表明:天鹅湖湖水中总氮、总磷浓度平均值分别为1.53g/L和0.07g/L,其浓度大小分布依次为北部>东部>西南部;底泥中总有机碳、总氮和总磷平均含量分别为1.68%、0.17%、0.05%,并且底泥中总有机碳、总氮含量大小分布趋势依次为东部>西南部>北部,总磷为北部>西南部>东部;当湖水平均N/P>16时,最大值出现在西南部,最小值位于北部,在湖水中生长的植物将受到湖水中磷含量的限制;天鹅湖西南部湖区底泥C/N比为7.38-13.01,说明沉积物有机质主要来源是海草大叶藻,而北部湖区C/N比为3.54-9.75及东部湖区为2.5-12.37,说明沉积物有机质主要源于藻类与浮游植物;天鹅湖已处于富营养化状态,只有有效控制人为污染物的排放,才能促进天鹅湖水生态系统健康发展。

The average total nitrogen and phosphorus concentration in the water of the Rong cheng Swan Lake was 1.53 g/L and 0.07 g/L,respectively,which distributed in the pattern of north>east>southwest.The average total organic carbon,nitrogen and phosphorus content in the bottom sediment were 1.68%,0.17% and 0.05%,respectively.And the distribution trend of total organic carbon and nitrogen cotents was north>southwest>east,while the total phosphorus was east>southwest>north.When the average N/P of the lake was above 16,the maximum occurred in the southwest and the minimum in the north,and the plants growing in the lake would be limited by the phosphorus content in the lake.The C/N ratio of sediment in the southwest Swan Lake was 7.38-13.01,indicating that the main source of sediment organic matter was eelgrass Z.marina.The C/N ratio was 3.54-9.75 in the northern lake and 2.5-12.37 in the eastern lake,indicating that the sediment organic matter mainly came from algae and phytoplankton.The Swan Lake was already in a state of eutrophication and the discharge of human pollutants must be controlled.