Jin,X., Wang,S., Bu,Q. and Wu,F.(2006):
Laboratory experiments on phosphorous release from the sediments
of 9 lakes in the middle and lower reaches of Yangtze River region,
China. Water, Air, and Soil Pollution, 176,
233-251.
『中国の長江地域の中流域と下流域における9つの湖の堆積物からのリン放出についての実験室での実験』
『Abstract
Phosphorus (P) has been recognized as the most critical nutrient
limiting lake productivity. In addition, P release from sediments
may have a significant effect on the water quality and may result
in continuous eutrophication in eutrophic lakes. In this study,
P release kinetics from sediments and their relationship with
sediment composition were investigated, eutrophication risk index
(ERI) and degree of phosphorous saturation (DPS) were used to
evaluate the eutrophication risk of the studied sediments, and
their influencing factors were also discussed. The results show
that total P (TP), organic matter (OM), Al2O3+Fe2O3
and the percentage of sand particles were the most important factors
affecting the ability of P sorption. P release process was similar
for all studied sediments, consisting of the quick and slow reaction
processes. The quick reaction mainly occurred within 0.5 h, and
slow reaction after 0.5 h. P release occurred within 20 h and
then reached the dynamic equilibrium. P release process was slower
than P sorption process. Three models (Power function model, Parabolic
diffusion model and Simple Elovich model) can satisfactorily describe
the P release kinetics. P release was mainly affected by TP, OM,
sorbed total phosphorus (STP), DPS and sand particles, and quick
P release was mainly a physical process. For the slightly polluted
sediments, Al2O3+Fe2O3 mainly restrained P release.
But for the heavily polluted sediment both OM and Al2O3+Fe2O3
promoted P release. Both DPS and ERI can be used to evaluate the
P-induced lake eutrophication risk, and their threshold values
were 6.6% and 25%, respectively. Based on the assessment by DPS
and ERI, most of the studied sediments were in eutrophication
risk for the studied sediments. For the heavily polluted sediments,
Al2O3+Fe2O3 was significantly correlated with DPS. But for
the slightly polluted sediments it was significantly negatively
correlated with DPS and OM, and the sand particle percentage was
negatively related to ERI.
Keywords: phosphorus release; kinetics; sediment composition;
DPS; ERI; middle and lower reaches of Yangtze River region』
1. Introduction
2. Materials and methods
2.1. Study areas
2.2. Sediment sampling and analyses
2.3. Release kinetic experiments
3. Results and discussion
3.1. Sediment characteristics
3.2. The release kinetics of phosphate on sediments
3.3. The risk of P release from the sediments
3.4. The affecting factors of the risk of phosphorus release
4. Conclusion
Acknowledgement
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