%0 Journal Article
%A TANG Xian-qiang
%A WU Min
%T Impacts of Water Level Regulation on Estuary Sediment PhosphorusStorage and Bioavailability
%D 2015
%R 10.11988/ckyyb.20140539
%J Journal of Yangtze River Scientific Research Institute
%P 8-13
%V 32
%N 12
%X <p>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<sup>-1</sup>,3 cm.d<sup>-1</sup> and 6 cm.d<sup>-1</sup>).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<sup>-1</sup> and 6 cm.d<sup>-1</sup> 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.</p>
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20140539