玄武湖沉积物中磷的形态分布特征

利用分级提取法分析了玄武湖的沉积磷形态,在玄武湖沉积物中,铝结合态磷的含量较低,平均值为64 mg/kg,其余形态磷中,铁结合态磷为241 mg/kg,有机磷为335 mg/kg,钙结合态磷为394 mg/kg.在环境变化的条件下,铁结合态磷可以释放到间隙水和上层水体中,是湖泊产生富营养化的重要因素;铝结合态磷由于含量少,对湖泊富营养化影响很小;钙结合态磷相对稳定且很难被生物利用,对湖泊富营养化影响不大;有机磷对水体有机负荷影响较大,并影响水体富营养化程度.

D istribution of PhosphorusSpeciation in Lake Xuanwu Sediments

Distribution of phosphorus speciation in lake Xuanwu sediments was analyzed with classification extraction method.The studies indicated that the concentration of aluminum bound phosphorus(Al-P) was low in the sediment and the average value was 64 mg/kg.Among the other speciation of phosphorus,iron bound phosphorus(Fe-P) was 241 mg/kg,organic phosphorus(Org-P) 335 mg/kg,CaCO3 bound phosphorus(Ca-P) 394 mg/kg.The Fe-P,which can be released into the gap and the upper water when environment changes,is the important factor of lake eutrophication.The Al-P has little impacted lake eutrophication because of its low concentration.The Ca-P was relatively stable and hardly used by biology.The Org-P has impacted organic load and influences lake eutrophication.