澜沧江梯级水库沉积物磷形态特征及释放风险

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Abstract The physical and chemical properties of sediments and overlying water were studied to elucidate the spatial distribution characteristics and potential release risk of phosphorus fractions in four cascade reservoirs in the middle and lower reaches of the Lancang River. The results showed that the total phosphorus content in the sediment of each reservoir varied from 266.66mg/kg to 842.87mg/kg, with an average of 533.18mg/kg. The spatial distribution of organic phosphorus (OP) fraction exhibited that sediment of Gongguoqiao Reservoir was mainly composed of bioavailable OP, while the OP fractions in other reservoirs was mainly composed of Residual OP. The correlation analysis showed that organic matter and environmental factors of overlying water were the important factors affecting the distribution of phosphorus fractions in sediments. The analysis of orthophosphate (PO₄^3--P) concentration at the sediment-water interface indicated that the PO₄^3--P concentration of pore water ranged from 0.017 to 0.258mg/L and the PO₄^3--P concentration of overlying water ranged from 0.015 to 0.055mg/L. The sediments acted as the P source to the overlying water, which ranged from 0.010 to 0.116mg/(m²·d). Seasonal hypoxia and regional sedimentation might lead to a large risk of PO₄^3--P release in the downstream reservoir.

Key words： Lancang River sediment phosphorus fractions release risk

Received: 28 November 2022

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X524

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	Articles by authors
	SUN Meng
	BAO Yu-fei
	WANG Yu-chun
	HU Ming-ming
	LI Shan-ze
	WEN Jie
	ZHANG Di

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SUN Meng,BAO Yu-fei,WANG Yu-chun等. Characteristics of phosphorus fractions distribution and release risk of sediment in the cascade reservoirs in the middle and lower reaches of Lancang River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3634-3643.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3634

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