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中文摘要：
在太湖草型区、藻型区及河口区采集原状泥柱进行加藻培养实验,监测培养过程中溶解氧（DO）、总氮（TN）、总磷（TP）、氨氮（NH 4＋-N）、磷酸根（PO43--P）等相关指标的变化.结果表明,蔽光培养导致加藻体系中蓝藻大量死亡,形成水体极度缺氧环境（DO接近0）,沉积物氮、磷释放量改变,上覆水NH 4＋-N、PO43--P浓度大幅上升;与未加藻的培养体系相比,水华衰亡分解在草型区、藻型区、河口区引起的沉积物TN平均释放改变量分别为-0.1、31.1、9.5 mg.（m2.d）-1,TP平均释放改变量分别为-3.01、0.75、2.46 mg.（m2.d）-1,上覆水NH 4＋-N浓度增加分别为3.62、5.10、6.57 mg/L,PO34--P浓度增加分别为53、219、418μg/L.沉积物氮、磷的释放改变量因湖区而异,藻型区及河口区释放量有较大的增长,草型区释放量则明显偏低.水相营养盐的增量与缺氧程度及蓝藻水华堆积的持续时间明显相关.研究表明,大型浅水湖泊中水华堆积衰亡引起沉积物营养盐的释放量增加可能是蓝藻水华状态自维持的机制之一.
英文摘要：
Sediment cores were sampled in macrophyte dominated zone,phytoplankton dominated zone and river mouth in Lake Taihu and incubated with one half of them added algae in laboratory in August to reveal the influence of algal accumulation on the release of nitrogen and phosphorus in sediments.Concentrations of dissolved oxygen（DO）,total nitrogen（TN）,total phosphorus（TP）,ammonium,phosphate and other parameters were determined during cultivation of the sediment cores in dark.There were differences in release of TN and TP in sediments and significant variations in changes of DO,ammonium,phosphate in overlying water after adding algae.When DO declined to nearly zero,the changes of release of TN,TP in sediments differed from different ecological types of Lake Taihu with minus numbers of-0.1,-3.01 mg.（m2.d）-1 in macrophyte dominated zone,larger numbers of 31.1,0.75 mg.（m2.d）-1 in phytoplankton dominated zone and 9.5,2.46 mg.（m2.d）-1 in river mouth.The concentrations of ammonium in overlying water increased 3.62,5.10,6.57 mg/L and phosphate increased 53,219,418 μg/L in macrophyte dominated zone,phytoplankton dominated zone,river mouth,respectively.The changes of nutrients have good correlations with the decrease of DO and duration.The release of nutrients from sediments caused by accumulation and decay of algae may be the way that algal bloom satisfied itself.
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