太湖不同营养类型湖区沉积物磷的形态与吸附行为的比较

选择太湖不同营养类型的湖区开展了沉积物磷形态与磷吸附行为的研究,结果表明,位于藻型湖区梅梁湾的T1点表层沉积物中的总磷(TP)含量高于位于草型湖区T2点的相应值,且沉积物吸附能(K)值与TP含量显著负相关(ppp0)值随深度递增,大型水生植物的存在促使表层沉积物维持磷汇的功能,T1点沉积物距表层10~15cm处EPC0值最低,故相应疏浚深度宜为10~15cm,这一结果为富营养化湖泊的修复提供了理论依据与技术参数。

Comparison of fractions and sorption behaviors of sediment phosphorus between typical zones with different trophic states in Lake Taihu,China

Typical zones with different trophic states were selected to study fractions and sorption behaviors of phosphorus in sediment of Lake Taihu,China.Results showed that the surface sediment sampled at Site T1 in the Meiliang Bay as a typical area dominated by algae had a higher content of total phosphorus (TP) relative to that at Site T2 in the Xukou Bay as a typical area dominated by macrophyte.Additionally,there existed a significantly negative relationship between phosphorus sorption energy (K) and TP content (pK value (p0) increased with depth,it meant that macrophyte existed there kept surface sediment to still function as phosphorus sink.While,in the sediment of Site T1,the EPC0 showed the lowest value at subsurface layer (10—15 cm),which may serve as a suitable depth for sediment dredging.The results provided a theoretical basis and technical parameters for restoration of eutrophic lakes.