惠州西湖底泥中氮磷特征的初步研究

惠州西湖为典型的亚热带城市浅水湖泊.为了调查该湖泊底泥性质了解底泥对水质的影响.2004年8月在惠州西湖5个子湖(南湖、丰湖、平湖、菱湖和鳄湖)采集了6个底泥柱样,对其含水率、烧失量(LOI)、总氮(TN)、总磷(TP)、藻类可利用性磷(AAP)和粒度的垂向特征进行了初步研究.结果表明,各子湖中南湖内源负荷最大,底泥中的LOI、TN、TP和AAP含量高于其他湖区数倍以上,表层值较高,表明曾遭受过严重的污染,而其它湖区的垂向变化不明显.底泥成分以粘土、粉砂为主,水体混浊度高可能与底泥粒径较小以及鱼类和游船活动的强扰动性有关.

Preliminary study on the characteristics of nitrogen and phosphorus in the sediments of Huizhou West Lake

Huizhou West Lake is a subtropical shallow urban lake in Guangdong Province,southern China.In this study,the lake sediment characteristics were investigated to understand the impact of sediments on water quality.Six sediment cores were taken from five sub-lakes of Huizhou West Lake(Nanhu,Fenghu,Pinghu,Linhu and E-hu) in Aug.2004.The sediments was analyzed for water content,LOI,TN,TP,AAP and grain size.The results showed that the sediments from Nanhu had a several times higher contents of TP,TN,LOI and AAP,and the higher values at lower depths suggested that pollution in this area was very serious.Low variation in the vertical profiles of the sediment from other area indicated the effects of dredging on the sediments.High water turbidity was likely related to small grain size of the sediments and high turbulence caused by fish and boating activity in this lake.