底泥再悬浮状态下生物有效磷形成机制研究

研究了底泥再悬浮状态下,不同形态磷及生物有效磷(BAP)含量的变化,并对生物有效磷的形成机制进行了初步探讨.结果表明,底泥再悬浮对磷的赋存形态有显著的影响.随着底泥再悬浮时间的延长,铁结合态磷(BD-P),铝结合态磷(Al-P),钙结合态磷(Ca-P)含量显著增加,而弱吸附态磷(NH4C1-P)则有所减少.底泥再悬浮后, BAP平均下降6.59%,说明底泥再悬浮促进了 BAP 向难被生物利用态磷的转化.藻类可利用磷(AAP)主要来自BD-P,但提取AAP后,再悬浮底泥BD-P释放量平均下降了33.4%,而对照试验底泥BD-P释放量则增加了19,8%,说明BD-P的性质对AAP的形成有显著的影响;NaHCO,可提取磷 (Olsen-P)主要来自BD-P、Al-P 和 NaOH-nrP,按照三者的释放量, Olsen-P与BD-P的关系更为密切.

Formation Mechanism of Bioavailable Phosphorus in Sediments Under the Conditions of Sediment Re-suspension

The concentrations of different sedimentary phosphorus forms and bioavailable phosphorus were studied and the formation mechanism of BAP in sediments was discussed, under the conditions of sediments re-suspension. The results show that sediment re-suspension had obvious effect on the distribution of different sedimentary phosphorus forms. The BD-P, Al-P, Ca-P were increased evidently and the NH₄Cl-P was decreased with the time of sediment re-suspension extending. The BAP in sediments after re-suspended was reduced by 6.59%, indicating that sediment re-suspension could promote the transformation from BAP to nonbioavailable phosphorus. The formation of AAP might mainly have close relationships with BD-P. After extracting AAP, the BD-P was decreased by 33.4% averagely in the sediments after re-suspended, while the release of BD-P in sediments from the control experiment was increased by 19.8%, showing that the formation of AAP was affected marked by the properties of BD-P. The Olsen-P could be mainly formed from BD-P, Al-P, NaOH-nrP. The formation of Olsen-P was closely correlated to BD-P, based on the release of BD-P, Al-P, NaOH-nrP.