中文摘要：

利用化学提取方法对太湖6个样点，巢湖4个样点和龙感湖3个样点的表层沉积物和沉积物柱样进行了生物可利用磷（BAP）测定．北太湖表层沉积物的平均含量为259．5mg／kg，而西部湖区平均含量为114．6mg／kg，湖心区平均含量为40．6mg／kg，而东太湖平均含量为50．7mg／kg，呈显著北高南低的特点．巢湖西部湖区表层沉积物的BAP平均含量为254．2mg／kg，而东部湖区BAP含量降低为101．9mg／kg．龙感湖表层沉积物BAP平均含量为67．8mg／kg．显著表明污染程度较高的湖区沉积物的BAP相应较高．BAP在沉积物中随深度呈指数降低，显示生物可利用磷在沉积作用下向稳定的非活性磷转化．夏季沉积物中的BAP由于生物活性的增强向溶解态活性磷转化过程增强，显示为较低的BAP含量．BAP含量与水体溶解态活性磷呈正相关关系，且该相关性在BAP含量较低的样点好于高BAP的样点．

英文摘要：

Bioavailable Phosphorus （BAP） in sediments of Lake Taihu （6 sites）, Lake Chaohu （4 sites） and Lake Longgan （3 sites） was analyzed by chemical extraction method. The mean BAP content in north Lake Taihu was 259.5 mg/kg, 114.6 mg/kg in west of Lake Taihu, 40.6 mg/kg in the middle of the lake and 50.7 mg/kg in East Lake Taihu. It was very obvious that BAP contents were higher in the north of the lake and lower in the south. The mean BAP content in the west of Lake Chaohu was 254.2 mg/kg while was 101,9 mg/kg in the east of the lake. The content is 67.8 mg/kg in Lake Longgan. All these data showed the more polluted lakes （ lake zones） was with higher BAP contents in the sediments. The BAP contents in the sediment cores decreased exponentially that meant the BAP would transform to non-bioavailable form with sedimentation effect. Because of the higher bioactivity in summer, the BAP was more easily transformed to soluble phosphorus and resulted in lower content in the sediment. There was positive correlation between the BAP contents in sediments and soluble reactive phosphorus （SRP） and the correlation was better in the lakes/lake zones with lower BAP contents than in the lakes/lake zones with higher contents.