太湖西部入湖河口区表层沉积物磷素分布特征

DISTRIBUTION OF PHOSPHORUS FRACTIONS IN SURFACE SEDIMENT AT ESTUARIES OF WESTERN TAIHU LAKE

采用SMT法对太湖西部主要入湖河流河口区大港河、乌溪港、庙渎港、大浦港、陈东港、社渎港、沙塘港以及太滆运河表层沉积物磷形态进行分析。结果表明:各河流河口区总磷分布由南向北含量逐渐升高,为300.84~824.89 mg/kg。其中,最高值出现在陈东港,比平均值高约35%;无机磷为表层沉积物磷的主要存在形态,其中西北部河口区铁铝磷含量较高,占TP含量为61%~80%;西部河口区钙磷含量较高,可能与其入湖河流沿岸土地利用类型有关;有机磷在西北部河口区所占比小于20%,可能由于西北部蓝藻爆发,有机磷被大量利用导致。

In this paper,the form of phosphorus in surface sediments in estuaries of rivers of west Taihu Lake,such as Dagang River,Wuxi Port,Miaodu Port,Dapu Port,Chendong Port,Shedu Port,Shatang Port and Taige Canal,was analyzed by SMT method. The results showed that the distribution of total phosphorus（ TP） in the estuaries of rivers increased from south to north,which differed from 300. 84 mg/kg to 824. 89 mg/kg. The highest value appeared in Chendong port,which was above the average value of 35%. Inorganic phosphorus（ IP） was the main form of phosphorus in surface sediments. What＇s more,the content of iron phosphorus and aluminium phosphorus（ Fe/Al-P） in the northwest estuary area was high,which accounted for 61% ~ 80% of TP. The content of calcium and phosphorus（ Ca-P） was also high in the western estuary area,which may be related to the land use type along the river bank. Meanwhile,the content of organic phosphorus（ OP） in the estuary area of the northwest was less than 20%,which may be due to the flood of cyanobacteria in the northwest,and then the OP was widely used in the northwest estuarine area.