Distributions of phosphorus fractions in the sediments of a river-lake system: a case study in Huai River catchment area, China.
Phosphorus (P) forms, with respect to sediment characteristics, and an in-stream sluice were studied in the river-lake system, Huai River catchment area, China. The mean of total P in sediments in the mainstream of the Huai River was higher than that in the Hongze Lake. It was found that P fractions varied in the sediments throughout the river and lake. Detrital-P was the dominant P fraction in the mainstream and organic P and detrital-P were the dominant P fractions in the lake, which could indicate: biologically available and non-biologically available forms. Useful information for the interpretation of P fractions could also be obtained from major sediment characteristics. Whether the relations between P fractions and grain size characteristics were significant or weak, 0.125 mm was a threshold grain size for P fraction distribution in sediment. In addition, the Bengbu Sluice, one of the most important in-stream facilities in the Huai River catchment area, regulated not only the transport of P in sediments upstream and downstream of the sluice, but also the distribution of P fractions in the river-lake system. Therefore, it was confirmed that nutrient loadings could be prevented from reaching the watershed, as well as improved ecological diversity by integrating sluice operation.
Graduate School of Horticulture, Chiba University, 648 Matsudo-city, Chiba Prefecture 271-8510, Japan E-mail: cytang@faculty.chiba-u.jp.
Piao
P
Jingqiu
Graduate School of Horticulture, Chiba University, 648 Matsudo-city, Chiba Prefecture 271-8510, Japan E-mail: cytang@faculty.chiba-u.jp.
Tang
T
Changyuan
Key Laboratory of Water Cycle and Related Land Surface Process, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Datun Rd. A11, Chaoyang District, Beijing 100101, China.
Song
S
Xianfang
D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D060106:Lakes; D010316:Particle Size; D010758:Phosphorus / Q000032:analysis*; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis
D014874:Water Pollutants, Chemical; D010758:Phosphorus