Phosphorus Sorption Capacity of the Surface Sediment in the Lake Taihu and Risk Assessment of Phosphorus Release
Year: 2004
Type: article
Abstract: 利用沉积物磷吸附指数(PSI)和磷吸附饱和度(DPS)等指标来表征太湖表层沉积物的磷吸附容量,并探讨了太湖沉积物磷吸附容量的空间变化。研究发现:草酸铵提取的磷以及活性铁、铝氧化物含量在梅梁湾东北部至五里湖一带的沉积物中较高,而在太湖南部湖区相对较低,这主要是与附近城市污水的实际贡献有着密切关系;太湖沉积物的磷吸附指数大体上有着北高南低、西高东低的分布特征,而磷吸附饱和度分布与PSI恰有相反的特征;沉积物中磷的吸附容量可能主要受到无定形的铁和铝的氧化物控制,也受沉积物有机质含量的影响。初步确定了用磷吸附指数和磷吸附饱和度来表征的湖泊沉积物磷释放风险指数概念,并应用于对太湖沉积物磷诱发的富营养化风险的评估。;Phosphorus sorption capacity of the surface sediments are estimated by the phosphorus sorption index (PSI) and the degree of phosphorus saturation (DPS) of the sediments in the Lake Taihu, China.In addition, the spatial variability of phosphorus sorption capacity of the sediments is discussed by the geostatistical methods of Kriging griding.There are higher concentrations of oxalate extractable phosphorus, iron and aluminum in the sediments of northeastern Meiliang Bay and Wuli Lake, while they are lower in the sediments of southern Lake Taihu.The spatial variability of oxalate extractable phosphorus, iron and aluminum may be largely attributed to the inputs of wastewaters.The distribution of phosphorus sorption indices of the Taihu sediments are characterized by higher in the north, lower in the south, higher in the west, and lower in the east, etc., while the very reverse is the distribution of degree of phosphorus saturation.DPS are less than 20% in most lake areas except that it is more than 30% in the northwestern Meiliang Bay.The phosphorus sorption capacity may be mainly controlled by the amorphous iron and aluminum oxides/hydroxides, and also be affected by organic matter contents in the sediments.The P-induced lake eutrophication risk index (ERI) is developed as the percentage of DPS divided by PSI, and is applied on the assessment of eutrophication risk of the Lake Taihu.
Source: Journal of Lake Sciences
DOI: 10.18307/2004.0201
Authors: HUANG Qinghui, WANG Zijian, WANG Donghong, WANG Chunxia, MA Mei
Language: English
Subfield: Environmental Chemistry
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2383637093