Phosphorus fractions and the effect of pH on the phosphorus release of the sediments from different trophic areas in Taihu Lake, China

Characteristic of phosphorus release with the control of pH of sediments from Meiliang Bay, Lake Taihu

“…湖泊沉积物是磷等营养物质的重要蓄积库 [4] , 同时又是潜 在的二次污染源 [5][6] . 在长江中下游湖泊水体磷的环境背景值较高的情况下, 磷的内源负荷受到越来越多 的关注 [7][8][9] .…”

“…酸性 pH 条件下磷含量高于中性 pH 值磷含量. 中性 pH 值磷释放最为弱, 各 pH 值对磷含量的响应呈明显 的"U"型态(图 1), 这也与 Jin [5] 、Nur [24] 、王晓蓉 [25] 等恒温震荡条件下的实验研究结果相吻合.…”

Release characteristics of sediment phosphorus in all fractions of West Lake, Hang Zhou, China

“…pH had also an important secondary effect on P release from the lake sediment, if iron (II) and orthophosphate was released from an anaerobic sediment surface and mixed into aerobic lake water at high pH, only part of the released P was bound to the re-precipitated iron (III) compounds (Bostrom, 1988). Meanwhile, the alkaline condition facilitated the competitive adsorption of OH − and some anions, and OH − may exchange with phosphate in the Fe-P and A1-P complex, thus increased the desorption process of phosphate, subsequently resulting in a great amount of P liberation from positive adsorption sites (Jin et al, 2006); (2) orthophosphate in the water existed as HPO 4 2− and H 2 PO 4 − in the neutral condition, easy to combine with metal ions and adsorbed on sediment, thus reduced the release amount; (3) the acidic condition increased the solubility of adsorbed sedimentary phosphorus, especially affected the desorption of Ca-P from sediment.…”

“…pH in the overlying water and sediment was a predominant factor as it affected desorption-adsorption, precipitationsolubilization and oxidation-reduction reactions through its control over the concentrations of available iron, aluminum, and calcium, thus directly or indirectly changing the aquatic, biological and chemical reactions (Jin et al, 2006). In ordinary conditions, sediment pH in lakes between 6.5 and 8.5.…”

A niche model to predict Microcystis bloom decline in Chaohu Lake, China

“…Various physicochemical factors, biotic effects and hydro-meteorological characteristics have been assumed to be main reasons for cyanobacterial blooms (Paerl et al, 2001;Jin and Wang, 2006;Jiang et al, 2008;Goleski et al, 2010;Wang et al, 2011a). Many models have been developed to predict the dynamics of cyanobacterial blooms.…”