Title: Biogeochemical function of phosphorus-solubilising bacteria on cycling of phosphorus at the water-sediment interface under laboratorial simulated conditions

Authors: Jian-Hang Qu; Hai-Feng Li; Nan Chen; Hong-Li Yuan

Addresses: State Key Lab for Agrobiotechnology, Key Laboratory of Agro-Microbial Resource and Utilization, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100193, China; College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China ' State Key Lab for Agrobiotechnology, Key Laboratory of Agro-Microbial Resource and Utilization, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100193, China; College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China ' State Key Lab for Agrobiotechnology, Key Laboratory of Agro-Microbial Resource and Utilization, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100193, China ' State Key Lab for Agrobiotechnology, Key Laboratory of Agro-Microbial Resource and Utilization, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100193, China

Abstract: With an efficient phosphorus-solubilising bacterium (PSB) Paenibacillus sp. isolated from sediment of a eutrophic water reservoir, the biogeochemical function of bacteria on the P-cycling at water-sediment interface was studied using simulated columns at laboratorial scale. Results showed that, when PSB formed biofilm at water-sediment interface, the P content showed a largest reduction of 56 mg/L in the water phase and of about 40-50 mg/L in the pore water of the sediment comparing to blank columns without PSB. The activity of alkaline phosphatase in the water phase increased as the bacterial biomass increasing when the P content is low. Great changes of Mg2+, Ca2+ and Fe2+ contents in the upper water phase and the pore water of sediment was observed when pH value increased from 7.5 to 8.5 at the interface mediated by the PSB, and had the similar trend of that of the P content. Results suggested that PSB could accelerate release of P from sediment, and the biogeochemical function of PSB on P-cycling between water phase and sediment relied on pH conditions of the upper water phase and the interfacial pore water, and influenced the concentration of metal ions, mainly as Mg2+ and Ca2+.

Keywords: phosphorus solubilising bacteria; phosphate cycling; water eutrophication; water-sediment interface; environmental pollution; water pollution; biogeochemical function; simulation; water reservoirs; biofilm; metal ions; calcium; magnesium; iron.

DOI: 10.1504/IJEP.2013.056361

International Journal of Environment and Pollution, 2013 Vol.52 No.1/2, pp.104 - 116

Accepted: 05 Jun 2013
Published online: 11 Sep 2013 *

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