汤逊湖·南湖及墨水湖底泥沉积物中氮磷的释放特征

Release Characteristics of Nitrogen and Phosphorus in the Sediments of Tangxun Lake,South Lake and Moshui Lake

在夏季环境下以武汉汤逊湖、南湖和墨水湖的底泥沉积物为目标,采用蒸馏水作为上覆水进行静态释放试验,监测各试验柱上覆水中氮磷营养盐的变化趋势,计算TN、TP的累计释放量,分析湖泊底泥中氮磷营养盐的释放规律。结果表明,各湖泊底泥样本向上覆水中释放的氮主要以NO_(3)^(-)-N的形式存在;墨水湖底泥向上覆水中释放的氮最多,南湖底泥向上覆水中释放的磷最多。3个湖泊的底泥向上覆水释放的氮磷总量仅占底泥氮磷总量的极少部分,说明汤逊湖、南湖和墨水湖底泥均具有较大的氮磷释放潜力。

Under the summer environment,taking the sediments of Tangxun Lake,South Lake and Moshui Lake in Wuhan as the target,the static release test was conducted with distilled water as the overlying water to monitor the change trend of nitrogen and phosphorus nutrients in the overlying water of each test column,calculate the cumulative release amount of TN and TP,and analyze the release rule of nitrogen and phosphorus nutrients in the lake sediment.The results showed that the nitrogen released to the overlying water from the sediment samples of each lake mainly existed in the form of NO_(3)^(-)-N;the sediment of Moshui Lake released the most nitrogen to the overlying water,and the sediment of South Lake released the most phosphorus to the overlying water.The total nitrogen and phosphorus released by the sediment of the three lakes from the upper water cover accounts for only a very small part of the total nitrogen and phosphorus of the sediment,indicating that the sediment of Tangxun Lake,South Lake and Moshui Lake all had greater nitrogen and phosphorus release potential.