太湖不同湖区沉积物磷形态变化分析

采用SMT法于2009年11月对太湖北部湖区梅梁湾(T1)、竺山湾(T2)、太湖西部(T3)、太湖南部(T4)、太湖东部(T5)及湖心区(T6)沉积物30cm深度上不同磷形态进行分析,结果表明,太湖不同营养水平湖区不同磷形态含量变化明显,北部竺山湾及太湖西部富营养化明显, NaOH-P含量明显高于其他湖区,占TP比例总体为T2 > T1 > T3 > T4、T5、T6.反映太湖北部及西部受人为污染源输入影响严重. HCl-P则表现为太湖北部及西北部含量总体低于太湖南部\东部,占TP比例总体为T4 > T5 > T6 > T1、T3 > T2. OP随深度至约15cm迅速降低,和太湖较强的矿化作用有关系. 同NaOH-P一样, TP表现出太湖北部及西北部含量高于其他湖区的总体趋势,反映了太湖北部和西北部湖区特别是竺山湾富营养化高于其他湖区.

Analysis of phosphorus forms in different regions of Taihu Lake

The vertical variations of phosphorus forms in sediment samples taken from the Meiliang Bay (T1), Zhushan Bay (T2), West Taihu Lake (T3), South Taihu Lake (T4), East Taihu Lake (T5) and Mid-lake region (T6) were analyzed applying the standard measurement and test (SMT) procedure. The results showed that phosphorus forms of different regions varied significantly. The concentrations of NaOH-P in Zhushan Bay and the West Taihu Lake were higher than other regions, and the proportions of NaOH-P accounting for TP decreased in the order: T2 > T1 > T3 > T4, T5, T6. It should be related to excessive anthropogenic input via rivers in the north and northwest of Taihu Lake. Whereas the proportions of HCl-P accounting for TP decreased in the order: T4 > T5 > T6 > T1, T3 > T2. OP decreased obviously at the ca. 15 cm depth, which might be related to the strong mineralization. Similar to NaOH-P, the concentration of TP exhibited the overall trend that the north and northwest of lake regions exceeded other regions, which reflected that eutrophication in the regions of north and northwest of Taihu Lake, especially in Zhushan Bay, was more serious than other regions.