汉阳湖群表层沉积物磷含量分布特征

Phosphorous Distribution of the Surface Sediments of Lakes in Hanyang District

2011年7月和10月对汉阳"六湖连通"工程的5个湖泊(后官湖、三角湖、南太子湖、墨水湖和龙阳湖)沉积物磷含量进行调查,研究其表层沉积物磷含量的空间分布和季节差异,以了解汉阳湖群的沉积物污染特征,为湖泊污染控制和生态修复提供依据。结果表明,后官湖沉积物磷含量最低,为(0.20±0.03)g/kg,龙阳湖最高,为(0.64±0.11)g/kg,二者差异显著(P<0.05),三角湖、南太子湖和墨水湖沉积物磷含量差异不显著(P>0.05)。除后官湖外,汉阳湖群沉积物磷含量季节差异不显著(P>0.05)。汉阳湖群沉积物磷含量具明显的空间分布特征,这种分布格局主要受外源污染输入的影响。相关分析表明,沉积物全磷与水体总氮、总磷和电导率呈极显著正相关(P<0.01),与水体透明度呈极显著负相关(P<0.01)。

A research on spatial distribution and seasonal difference of phosphorous contents in the surface sediments of Hanyang Lakes including Houguan Lake, Sanjiao Lake, Nantaizi Lake, Moshui Lake and Longyang Lake was conducted in July and October, 2011, aiming to understand pollution characteristic of the lake sediments and provide reference for pollution control and ecological restoration. Results showed that Houguan Lake had the lowest phosphorous content in sediments （0.20 - 0.03 g/kg）, and Longyang Lake the highest （ 0.64 ± 0.11 g/kg）. There was a significant difference in phosphorous content between these two Lakes （P 〈0.05 ）. No significant differences in phosphorous content were observed among Sanjiao Lake, Nantaizi Lake and Moshui Lake （ P 〉 0.05 ）. Except Houguan Lake, seasonal difference of phosphorous contents for Hanyang Lakes was insignificant （P 〈 0.05 ）. There was an obvious spatial distribution of sediment phosphorous in Hanyang Lakes, which was mainly caused by exogenous pollution. Correlation analysis indicated that total phosphorous of sediments had significant positive correlation with total nitrogen, total phosphorous, and conductivity of water （P 〈0.01 ）, and significant negative correlation with water transparency （P 〈 0.01 ）.