『Abstract
From June 2004 to December 2004, Lake Dianchi, which had large
scale of cyanobacterial blooms was investigated in order to study
P-fractionation in the suspended matter and the sediment. The
investigation improves our understanding of phosphorus in Lake
Dianchi and the relationship between phosphorus and cyanobacterial
blooms. It contributes to the available literature on the behavior
of P in hypertrophic lakes. The distribution of P-fractions in
Lake Dianchi was not uniform from northwest to south, but was
closely related to the trophic status of the whole lake. The concentrations
of total phosphorus, labile P (NH4Cl-P),
Organic P (NaOH-NRP) and loss on ignition in suspended matter
were positively correlated with the strength of cyanobacterial
blooms. Total phosphorus in suspended matter was relatively stable
for almost half an year and closely related to Chl. a concentration.
The main content of organic phosphorus is in the cyanobacterial
blooms. The concentrations of phosphorus bound to metal oxides
and carbonates (NaOH-SRP and HCl-P) in sediment were similar to
NaOH-SRP and HCl-P in the corresponding suspended matter. The
latter two forms of P in suspended matter were not affected by
cyanobacterial blooms, indicating that the inorganic phosphorus
is derived from the sediment after resuspension from the sediment
due to wind and wave action. The contribution of the different
P-fractions to TP in sediment and in suspended matter indicates
that NH4Cl-P in the suspended matter is an
important buffer for maintaining dissolved phosphorus in water.
Keywords: Phosphorus; Suspended matter; Sediment; Fractionation;
Cyanobacterial bloom; Lake Dianchi』
Introduction
Materials and methods
Study area
Sampling and analysis
Phosphorus fractionation
Statistical
Results and discussion
Suspended matter in Lake Dianchi
The temporal-distribution of the suspended matter in Lake Dianchi
Sediment in Lake Dianchi
Comparison of the distributions
Conclusion
Acknowledgment
References