Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

Ming Kong, Jianying Chao, Wei Han, Chun Ye, Chun-Hua Li and Wei Tian
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Ming Kong: Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, No. 8 Jiang Wang Miao Street, Nanjing 210042, China
Jianying Chao: Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, No. 8 Jiang Wang Miao Street, Nanjing 210042, China
Wei Han: Sino-Japan friendship Center for Environmental Protection, Beijing 100029, China
Chun Ye: Chinese Research Academy of Environmental Sciences, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Beijing 100012, China
Chun-Hua Li: Chinese Research Academy of Environmental Sciences, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Beijing 100012, China
Wei Tian: Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, No. 8 Jiang Wang Miao Street, Nanjing 210042, China

IJERPH, 2019, vol. 16, issue 12, 1-13

Abstract: To illustrate the contribution of phytoplankton-derived particulate organic matter (PPOM) to endogenous phosphorus (P) cycling and its effects on cyanobacteria blooms, PPOM characteristics, the degradation mechanism, and the growth of P-deficient Microcystis aeruginosa were studied in Lake Taihu. Results showed that PPOM is the most important P pool in the water column during cyanobacteria bloom, accounting for more than 80% of the total P (TP) in the water. During PPOM degradation, the particulate orthophosphate (Ortho-P) is the main species of P release from PPOM in the early degradation stage. The variations of polyphosphate (Poly-P) and phosphodiesters (Diester-P) contents were most significant, which were degraded completely within four days and eight days. Cell density and growth rate of M. aeruginosa using PPOM as P source were similar to those growing on Na 2 HPO 4 . The above results show that P in PPOM can be converted into available P by degradation, thus promoting the growth of M. aeruginosa . Therefore, the contribution of P release from PPOM degradation needs to be paid attention to in lake eutrophication control in the future.

Keywords: Phytoplankton; particulate organic matter; degradation; phosphorus; Microcystis aeruginosa; Lake Taihu (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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