Changes in the composition of phosphorus (P) compound groups in sediment and P in sediment pore water in a shallow eutrophic lake: a ³¹P NMR study

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• 作者：Ryuichiro Shinohara ; Akio Imai ; Nobuyuki Kawasaki ; Kazuhiro Komatsu…
• 关键词：31P NMR ; P in sediment pore water ; Orthophosphate diesters
• 刊名：Limnology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：18
• 期：1
• 页码：141-151
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Ecology; Environment, general; Freshwater & Marine Ecology;
• 出版者：Springer Japan
• ISSN：1439-863X
• 卷排序：18

文摘

We observed phosphorus (P) compound groups in sediment in Lake Kasumigaura in winter (February and March) and summer (July and August) to identify how their composition differs between the seasons. The concentration of soluble unreactive P in sediment pore water (SUP_pore) was significantly higher in winter than in summer, whereas the concentration of soluble reactive P (SRP_pore) was significantly higher in summer than in winter. In summer, when the concentration of SRP_pore was high, the concentration of orthophosphate was greatest (~80 %) among the P compound groups. The concentration of orthophosphate diesters had a significant negative correlation with SUP_pore concentration and was significantly lower in winter (high SUP_pore concentration) than in summer. Such relative abundance of P compound groups in sediment could have resulted from adsorption of orthophosphate in summer and degradation of orthophosphate diesters in winter; these seasonal processes could contribute significantly to the changes in the concentrations of SRP_pore and SUP_pore, possibly influencing the P concentrations in the water column in Lake Kasumigaura.