长江科学院院报Issue(12)：8-13,17,7.DOI:10.11988/ckyyb.20140539
水位调控对河口沉积物磷赋存及生物可利用性的影响
Impacts of Water Level Regulation on Estuary Sediment Phosphorus Storage and Bioavailability
摘要
Abstract
Continuously submerged and intermittently submerged sediments collected from Shendinghe River estuary of Danjiangkou reservoir,were employed to conduct the dynamic water level(WL)regulation experiments with 3 rates of change of water level (0 cm.d -1 ,3 cm.d -1 and 6 cm.d -1 ).The whole experiments lasted three WL regu-lating cycles (nearly four months)and each single cycle included four WL dynamic phases:decline,stable,ascend and re-stable.The results show that:WL regulation promotes OMloss of sediment and results in the increase of pH value.When compared with the data without WL regulated control,3 cm.d -1 and 6 cm.d -1 WL regulations lead to the increase of 185.56% -204.92%(continuously submerged sediments)and185.28% -228.76%(intermittent-ly submerged sediments)in concentrations of amorphous iron oxides,respectively.Furthermore,after WL regulation, concentrations of exchangeable phosphorus (Ex-P),aluminum bounded phosphorus (Al-P),iron bounded phos-phorus (Fe-P),calcium bounded phosphorus (Ca-P)and total phosphorus (TP)increase in intermittently sub-merged and continuously submerged sediments,whereas OMloss,occluded phosphorus (O-P)activation and trans-formation,greatly contribute to the decline of organic phosphorus (Org-P)and O-P in sediment.With respect to the activation of Org-P and O-P under WL regulation,both of the two phosphorus fractions should be categorized into bio-available phosphorus components.关键词
磷/沉积物/水位调控/理化性质/活化Key words
phosphorus/sediment/water level regulation/physical and chemical properties/activation分类
农业科技引用本文复制引用
汤显强,吴敏..水位调控对河口沉积物磷赋存及生物可利用性的影响[J].长江科学院院报,2015,(12):8-13,17,7.基金项目
国家自然科学基金项目（51209011，51379017）；长江科学院技术开发与成果转化推广项目 （）
