Species and biogeochemical cycles of organic phosphorus in sediments from a river with different aquatic plants located in Huaihe River Watershed, China.
The results of phosphorus fractionation in the sediments from a contaminated river containing different aquatic plants, analyzed by solution 31P-NMR for Organic Phosphorus, showed that the concentration of Inorganic Phosphorus dominated in all species and Organic Phosphorus accounted for over 20% of Total Phosphorus. In general, orthophosphate was dominant in all the sampling sites. The proportion of Organic Phosphorus accounting for the Total Phosphorus in the sediments with different plant decreased in the following order: Paspalum distichum>Typha orientalis>Hydrilla verticillata. Phosphorus-accumulation ability of Paspalum distichum was obviously stronger than Typha orientalis and Hydrilla verticillata. The Organic Phosphorus was in aquatic plants dominated by humic-associated P (Hu-P), which converted to Inorganic Ohosphorus more significantly in submerged plants than in emerged plants. The sediment dominated by Paspalum distichum abundantly accumulated Organic Phosphorus in the orthophosphate monoester fraction. The degradation and mineralization of orthophosphate monoester was the important source of high Inorganic Phosphorus concentration and net primary productivity in Suoxu River. The Organic Phosphorus derived from Typha orientalis and Hydrilla verticillata was dramatically converted to Inorganic Phosphorus when the environmental factors varied.
a School of Life Science and Institute of Wetland Ecology , Nanjing University , Nanjing , P. R. China.
He Zhong
HZ
Yuan
Wei
W
Pan
Li Jun
LJ
Ren
Eeng Feng
EF
Liu
Ji
J
Shen
Qi Fang
QF
Geng
Shu Qing
SQ
An
D002681:China; D019015:Geologic Sediments / Q000032:analysis*; D031321:Hydrocharitaceae / Q000378:metabolism*; D031781:Paspalum / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D017553:Phosphorus Compounds / Q000378:metabolism; D045483:Rivers / Q000737:chemistry; D032401:Typhaceae / Q000378:metabolism*; D014874:Water Pollutants, Chemical
D017553:Phosphorus Compounds; D014874:Water Pollutants, Chemical; D010758:Phosphorus
31P-NMR spectroscopy; aquatic plant; organic phosphorus; sediments; species and biogeochemical cycles