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Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus-31 NMR Study
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Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus-31 NMR Study
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Journal Article
Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus-31 NMR Study
2009
Overview
Information on the chemical composition of sediment phosphorus (P) is fundamental to understanding P dynamics and eutrophication in lake ecosystems. In this study, the surface (10 cm) sediments were collected from seven lakes representing two contrasting ecological areas in China: the middle and lower reaches of Yangtze River region and the Southwestern China Plateau. Phosphorus in these sediments was extracted by NaOH-EDTA and characterized by solution 31P nuclear magnetic resonance spectroscopy. Results show that P in the extracts was dominated by inorganic orthophosphate (76.7-97.4% of the extracted P) and orthophosphate monoesters (1.8-14.3%), with smaller amounts of orthophosphate diesters (0.4-8.9%), pyrophosphate (0.1-0.7%), and phosphonates (0.1-0.2%). The relative abundance of orthophosphate was higher in hypertrophic and shallow lake sediments than in eutrophic and mesotrophic and deep lake sediments, whereas the relative abundance of orthophosphate monoesters was the opposite. These observations suggested that the relative abundance of the two types of P forms in sediments might be related to the degree of lake eutrophication.
Publisher
American Society of Agronomy, Crop Science Society of America, Soil Science Society,American Society of Agronomy
