高磷沉积物有机磷形态分布及释放动力学特征——以宜昌西北口水库为例

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Abstract In order to explore the spatial distribution of organic phosphorus (OP) and its release dynamics in phosphorus-rich sediments of the reservoir, the Ivannoff method was used to extract sequentially different forms of OP in the sediments of Xibeikou Reservoir. Simulation experiments on OP kinetic release were performed the release characteristics of different OP fractions from the surface sediments, as well as the physicochemical properties of sediments and their responses to the OP release. The results showed that the OP content of the sediments in Xibeikou Reservoir was 210.3~455.2mg/kg, with an average content of 322.9mg/kg, accounting for 18.3% of the total phosphorus (TP). The spatial patterns of OP contents were characterized by the midstream (363.2mg/kg)>the downstream (339.3mg/kg)>the upstream of the reservior (266.1mg/kg), and longitudinally the OP contents decreased with the depth increasing. The patterns of different OP forms in Xibeikou Reservoir were shown as: inactive organic phosphorus (NOP)>medium active organic phosphorus (MLOP)>active organic phosphorus (LOP). NOP occupied 65.3% of OP, serving as the main forms of OP in the sediments of Xibeikou Reservoir. The quasi-first-order kinetic model was the optimal equation to describe the OP kinetic release curve of the sediments in the upstream, midstream and downstream of the Xibeikou Reservoir (R²=0.98~0.99, P < 0.01). The 0~1h period was the rapid-release stage, with released OP contents accounting for 55.68%~79.55% of the maximum release content (Q_max). Then it got to the slow-release stage, and gradually the release content reached Q_max, ranging between 1.4mg/kg and 3.1mg/kg. In the sediments of the reservoir, both LOP and MLOP were the main OP forms releasing to the overlying water.

Key words： Xibeikou Reservoir sediments organic phosphorus phosphorus forms release kinetics

Received: 30 April 2021

PACS:

X524

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	Articles by authors
	MA Xiao-yang
	NIU Feng-xia
	XIAO Shang-bin
	KANG Man-chun
	LIU Jia
	HU Jie-ming

Cite this article:

MA Xiao-yang,NIU Feng-xia,XIAO Shang-bin等. Distribution and release kinetics of organic phosphorus in phosphorus-rich sediments: A case study of Xibeikou Reservoir in Yichang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 293-301.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/293

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