沉水植物残体堆积量对沉积物理化性质的影响——以马来眼子菜为例

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Abstract In this study, the influence of the accumulation of submerged plant residues on the properties of surface sediments was clarified by using different contents of Malayan vegetable residues in the sediments and analyzing the changes of physicochemical properties and rheological properties of surface sediments. After one month's experiment, with the increase in the accumulation content of submerged plant residues, the surface sediment density decreased exponentially, accompanied by the formation of fluid sediment. Meanwhile, the results of sediment particle size distribution showed that the decomposition of submerged plant residues in the sediment led to the flocculation and agglomeration of the sediment. And the high values of polysaccharide/protein in extracellular polymeric substances (EPS) in sediments made sediment aggregates difficult to deposit, which is conducive to the formation of fluid sediment. In addition, the yield shear stress of sediments in rheological tests decayed exponentially (R²=0.97) with the contents of submerged plant residues. And when the accumulation content exceeded 0.4%, the values of yield shear stress gradually kept stable, resulting in sediment suspension. Overall, this study deepened the understanding of the impact of submerged plant residues decomposition on sediment properties, and the results can be helpful to sediment management in shallow lakes.

Key words： shallow lakes submerged plant residues sediment density extracellular polymeric substances rheological properties

Received: 01 August 2022

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X143

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	XU Da
	JIN Wei
	WEI Yi
	WANG Chun-liu
	ZHU Bo-song
	HUA Ke
	ZHOU Pan
	LIU Xin

Cite this article:

XU Da,JIN Wei,WEI Yi等. The influence of the accumulation of submerged plant residues on the physicochemical properties of sediments——a case study of Malayan cabbage[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1360-1367.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1360

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