垂向环流作用下湖泊沉积物磷迁移行为

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Abstract The release-adsorption dynamic characteristics of dissolved inorganic phosphorus (DIP) regulated by the vertical circulations at the sediment-water interface were examined through laboratory experiments with sediment samples collected from Shiwuli River estuary in Chaohu Lake. Potential effects of circulation intensity on the migration behavior of DIP from the sediments were discussed. Results showed that: the vertical circulation leaded to the increases of dissolved oxygen (DO) and suspended particulate matter (SPM) in the overlying water, with elevated disturbance intensities causing high equilibrium concentrations, however, the values of median diameter (D₅₀) were noted with a decreasing trend; the quantity of DIP released from sediment showed a clear Λ-type trend in terms of time under the disturbance of vertical circulations, of which the peak values were found positively correlated with the disturbance intensities (P=0.047<0.05), and the equilibrium concentrations were negatively correlated (P=0.034<0.05); increase of circulatory disturbance would enhance the adsorption of DIP by sediment, based on which, a modified Freundlich equation covering the hydrodynamic effect was constructed: lgQ_e=2.7074e^1.3487τ+0.9463e^-1.4830τlgC_e.

Key words： vertical circulation shallow lake sediment DIP release adsorption

Received: 25 October 2020

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X524

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	Articles by authors
	LIU Yuan-yuan
	CHU Ke-jian
	LU Ying
	HUA Zu-lin
	KY Sereyvatanak
	GU Li
	LIU Xiao-dong
	XU Long-long

Cite this article:

LIU Yuan-yuan,CHU Ke-jian,LU Ying等. Migration of phosphorus in lake sediments under vertical circulations[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2843-2852.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2843

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