Xiong Chun-hui, Zhagn Rui-lei, Wu Xiao-dong, Feng Li-hui, Wang Li-qing
Huan Jing Ke Xue. 2016 Mar 15;37(3):925-34.
This study investigated the horizontal distribution characteristics of nutrients and heavy metals (Zn, As, Cr, Cu, Ni, Pb, Cd and Hg) in January, 2014, and assessed the potential ecological risk of Lake Gehu. It was found that the average contents of TN and TP were 2,207.94 and 708.62 mg · kg⁻¹ respectively. TN and TP contents of the sediments at the centre were significantly highei than those in the north, while the TN content in the south was also significantly higher than that in the north of Lake Gehu. The average contents of Zn, As, Cr, Cu, Ni, Pb, Cd, Hg were 766.59, 350.66, 307.98, 59.54, 122.67, 168.97, 2.34, 0.41 mg · kg⁻¹, respectively. The content of Cu at the centre was significantly higher than that in the north, and the Zn content at the centre was significantly greater than that in the south of Lake Gehu, however the difference in the content of other heavy metals at these three areas was not significant. Furthermore, the obvious correlation between elements and granularity was only found in the aspect of TP, Cu and Hg. The comprehensive pollution index (PI) indicated that the Lake Gehu was heavily polluted, especially the centre and south areas. The potential ecological risk index (RI) showed that Cd, As and Hg had caused serious pollution in Lake Gehu while the other heavy metals only induced slight or medium pollution. According to the contribution of Cd, As and Hg to RI, it was concluded that the sediments in Lake Gehu were at a serious potential ecological risk.
本研究调查了2014年1月滆湖营养盐及重金属（锌、砷、铬、铜、镍、铅、镉和汞）的水平分布特征，并评估了滆湖的潜在生态风险。结果表明，总氮（TN）和总磷（TP）的平均含量分别为2207.94和708.62mg·kg⁻¹。滆湖中心沉积物的TN和TP含量显著高于北部，而南部的TN含量也显著高于北部。锌、砷、铬、铜、镍、铅、镉、汞的平均含量分别为766.59、350.66、307.98、59.54、122.67、168.97、2.34、0.41mg·kg⁻¹。中心区域的铜含量显著高于北部，中心区域的锌含量显著高于南部，然而这三个区域其他重金属含量的差异并不显著。此外，仅在TP、铜和汞方面发现元素与粒度之间存在明显的相关性。综合污染指数（PI）表明滆湖受到严重污染，尤其是中心和南部地区。潜在生态风险指数（RI）表明，镉、砷和汞已对滆湖造成严重污染，而其他重金属仅造成轻微或中度污染。根据镉、砷和汞对RI的贡献，得出滆湖沉积物存在严重潜在生态风险的结论。
