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Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus‐31 NMR Study
Author(s) -
Zhang Runyu,
Wu Fengchang,
He Zhongqi,
Zheng Jian,
Song Baoan,
Jin Linhong
Publication year - 2009
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2007.0616
Subject(s) - eutrophication , phosphorus , sediment , relative species abundance , abundance (ecology) , environmental chemistry , trophic level , lake ecosystem , plateau (mathematics) , composition (language) , environmental science , ecosystem , ecology , nutrient , chemistry , geology , biology , mathematical analysis , mathematics , organic chemistry , paleontology , linguistics , philosophy
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 31 P 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.