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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\u2010EDTA and characterized by solution <jats:sup>31<\/jats:sup>P nuclear magnetic resonance spectroscopy. Results show that P in the extracts was dominated by inorganic orthophosphate (76.7\u201397.4% of the extracted P) and orthophosphate monoesters (1.8\u201314.3%), with smaller amounts of orthophosphate diesters (0.4\u20138.9%), pyrophosphate (0.1\u20130.7%), and phosphonates (0.1\u20130.2%). 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.<\/jats:p>","DOI":"10.2134\/jeq2007.0616","type":"journal-article","created":{"date-parts":[[2009,1,13]],"date-time":"2009-01-13T21:37:31Z","timestamp":1231882651000},"page":"353-359","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus\u201031 NMR Study"],"prefix":"10.1002","volume":"38","author":[{"given":"Runyu","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Lab. of Environ. 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