JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2015, Vol. 32 ›› Issue (12): 8-13.DOI: 10.11988/ckyyb.20140539

• WATERRESOURCESANDENVIRONMEN • Previous Articles     Next Articles

Impacts of Water Level Regulation on Estuary Sediment PhosphorusStorage and Bioavailability

TANG Xian-qiang1,2,3,WU Min1,2,3   

  1. 1.Basin Water Environmental Research Department,Changjiang River Scientific Research Institute,Wuhan430010,China; 2.Key Lab of Basin Water Resource and Eco-environmental Science in Hubei Province,Changjiang River Scientific Research Institute,Wuhan 430010,China;3.Collaborative Innovation Center forGeo-Hazards and Eco-Environment in Three Gorges Area of Hubei Province,Yichang 443002,China
  • Received:2014-07-02 Online:2015-12-20 Published:2015-12-11

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 regulating 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 OM loss 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%(intermittently 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 phosphorus (Fe-P),calcium bounded phosphorus (Ca-P) and total phosphorus (TP) increase in intermittently submerged and continuously submerged sediments,whereas OM loss,occluded phosphorus (O-P) activation and transformation,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.

Key words: phosphorus, sediment, water level regulation, physical and chemical properties, activation

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