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TECHNICAL REPORTS

Wetlands and Aquatic Processes

Phosphorus Composition in Sediments from Seven Different Trophic Lakes, China: A Phosphorus-31 NMR Study

^a State Key Lab. of Environ. Geochemistry, Inst. of Geochemistry, Chinese Acad. of Sciences, Guiyang 550002, China
^b Graduate School, Chinese Acad. of Sciences, Beijing 100039, China
^c USDA-ARS, New England Plant, Soil, and Water Lab., Orono, ME 04469
^d Nakaminato Lab. for Marine Radioecology, Natl. Inst. of Radiological Sciences, Hitachinaka, Ibaraki 311-1202, Japan
^e Research and Development Center for Fine Chemicals, Guizhou Univ., 550002 China. Trade or manufacturers' names mentioned in the paper are for information only and do not constitute endorsement, recommendation, or exclusion by the USDA-ARS

^* Corresponding author (wufengchang{at}vip.skleg.cn, zhongqi.he{at}ars.usda.gov).

Received for publication November 26, 2007. 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.

Abbreviations: NMR, nuclear magnetic resonance • P_i, inorganic P • P_o, organic P • TP, total P