Abstract
Debris from aquatic macrophytes and algae are important recycling sources of phosphorus (P), which can result in continuing blooms of algae by recycling bioavailable P in the eutrophic lakes. However, knowledge of forms of P in aquatic macrophytes and algae and their contribution to internal loads of P in lakes is limited. Without such knowledge, it is difficult to develop appropriate strategies to remediate and or restore aquatic ecosystems that have become eutrophic. Therefore, in this work, P was extracted from six types of aquatic macrophytes and algae collected from Tai Lake of China and characterized by use of solution (31)P-nuclear magnetic resonance (NMR) spectroscopy. When extracted by 0.5M NaOH-25mM EDTA, extraction recovery of total P(TP) and organic P(Po) exceeded 90%. Concentrations of Po in algae and aquatic macrophytes were 5552mgkg(-1) and 1005mgkg(-1) and accounted for 56.0 and 47.2% of TP, respectively. When Po, including condensed P, was characterized by solution (31)P-NMR Po in algae included orthophosphate monoesters (79.8%), pyrophosphate (18.2%), and orthophosphate diester (2.0%), and Po in aquatic macrophytes included orthophosphate monoesters (90.3%), pyrophosphate (4.2%), and orthophosphate diester (5.5%). Additionally, orthophosphate monoesters in algal debris mainly included β-glycerophosphate (44.1%), α-glycerophosphate (13.5%), and glucose 6-phosphate (13.5%). Orthophosphate monoesters in aquatic macrophytes mainly included β-glycerophosphate (27.9%), α-glycerophosphate (24.6%), and adenosine 5' monophosphate (8.2%). Results derived from this study will be useful in better understanding nutrient cycling, relevant eutrophication processes, and pollution control for freshwater lakes.
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