摘要
研究了城市富营养化湖泊小南湖沉积物中不同赋存形态磷的水平空间变化和垂直方向分布。研究表明小南湖沉积物属于重度富营养状态,全湖区表层(0~20 cm)沉积物总磷(TP)的平均含量高达3.29 g/kg,其中位于污水处理厂附近的3#点ω(TP)高达6.42 g/kg,且表现出明显的表层富集现象。采用SMT法分析了沉积物中磷的赋存形态,其中无机磷(IP)是主要组成形式,含量为0.15~2.85 g/kg,约占ω(TP)的70%。受氧化还原条件影响,ω(IP)/ω(TP)的比例随着沉积物深度增加而减少。金属结合态磷以铁铝结合态(Fe/Al-P)为主,其含量在0.21~3.47 g/kg,而钙磷含量为0.09~1.42 g/kg,铁铝结合态磷的含量占总磷比例的60%以上。沉积物中的磷是主要的内源磷负荷,而无机磷是沉积物中可直接利用的磷形态,Fe/Al-P也是生物利用性较高的磷形态。小南湖沉积物属于释放风险较大的內源磷负荷,在将来的湖泊治理过程中应考虑合适的方法处理。
The spatial variation and vertical distribution of different forms of phosphorus in sediments of the Nanhu Lake were studied. The research indicated that the Nanhu Lake was in the state of severe eu-trophication. The total phosphorus(TP)showed high levels in sediment. Average level of TP in surfacesediments(0-20 cm)was as high as 3. 29 g/kg,and site 3# closed to the sewage treatment plantshowed the highest ω(TP),reached 6. 42 g/kg. As a major component in the form of total phosphorus,the inorganic phosphorus(IP)content was varied from 0. 15 to 2. 85 g/kg,which accounted for 70% ofTP. Influenced by the redox conditions,the ratio of ω(IP)/ω(TP)showed a decrease trend with thedepth increased. Iron and aluminum bound phosphorus(Fe/Al-P)accounted for more than 60% ofTP,the content was 0. 21-3. 47 g/kg,and the calcium bound phosphorus content was 0. 09-1. 42 g/kg.Phosphorus load in sediments was the major internal load to cause the lake to be eutrophication. IP andFe/Al-P were forms of higher bioavailability. Sediments are risky in releasing phosphorus load and great consideration shall be taken on the these characteristics in the future treatment and management.
出处
《江汉大学学报（自然科学版）》
2017年第5期400-405,共6页
Journal of Jianghan University：Natural Science Edition
基金
国家自然科学基金青年项目(21307164)
中央高校基本科研业务费专项资金自科一般项目(CZY17016)
关键词
南湖
沉积物
垂直分布
内源负荷
Nanhu Lake
sediment
vertical distribution
internal load
