多级生态塘/湿地系统底泥中磷的归趋模式

研究了多级生态塘/湿地处理系统不同单元底泥中磷的形态分布及释放规律,考察了季节和泥龄对磷形态分布及其释放的影响.结果表明,从系统前端到后端,钙磷在底泥中所占的比重逐渐增加,铝磷和碱可提取有机磷的比重逐渐减少;3～6月是底泥磷的集中释放期,主要释放单元为复合兼性塘,释放形态为铝磷和碱可提取有机磷;绝大多数铝磷和碱可提取有机磷在泥龄为 1.3 年时都释放到水体中.钙磷和铁磷是底泥中磷的主要贮存方式.

Transferring and attribution model of phosphorus in the multi-stage eco-ponds/wetlands system sediment

The rule of form distribution and release of phosphorus in the sediments of different units of multi-stage eco-ponds/wetlands treatment system was studied. Affection of season and sediment retention time on form distribution and release of phosphorus were investigated. The proportion of calcium-bound-phosphorus increased gradually and that of aluminum-bound-phosphates and alkali-extractable-organic phosphorus decreased from the front to the latter of this system. The concentrated release period of sedimentary phosphorus was from March to June, the main release unit was hybrid facultative pond and the release forms were aluminum-bound- and alkali-extractable-organic phosphorus, most of these phosphorus would be all released to waters in sediment retention time of 1.3 years. Calcium-bound- and iron-bound- phosphorus were main form of storing phosphorus in this sediment.