沉积物磷形态空间分布特征及释放风险评估——以沱江流域为例

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Abstract In order to clarify the spatial distribution characteristics of the phosphorus (P) in sediments and provide more accurate and suitable indicators for assessing P release risk, samples of surface sediments were taken from 12 sites in the main stream of the Tuojiang River and its tributaries for determining water-soluble phosphorus (WSP), equilibrium P concentration (EPC0), sediment P adsorption index (PSI) and adsorption saturation (DPS), and the derived P release risk index (ERI). The results show that the order of the P contents in the five forms of sediments is as follows: iron/aluminum combined P (CDB-P, 60.63%) > calcium P (Ca-P, 30.84%) > organic P (OP, 3.92%) > ferrous P (Fe(Ⅱ)-P), 3.48%) > loosely P (Loosely-P, 1.13%). CDB-P is the main form of sediment P (0.468~2.287mg/g) and decreases gradually from the upstream to the downstream, which is mainly related to upstream industrial pollution. The spatial distribution of DPS, EPC0and PSI tends to gradually increase with downstream, varying from 44.28% to 80.39%, 0.012 to 0.084mg/L and 0.153 to 1.526L/g, respectively. ERI exceeded 25% at the most upstream sampling sites, indicating a higher risk of P release in the upstream. Regression analysis and correlation show that EPC0 and the overlying water P, CDB-P, OP, OM, and particle size were significantly correlated. Therefore, EPC0can be thought to be a more accurate and efficient indicator for assessing the potential of P release from sediments in the Tuojiang River Basin. An increase in Fe/Al content, particle size, and the reduction of organic matter will elevate the P release risk, so the input of industrial pollution and agricultural non-point source pollution should be controlled.

Key words： phosphorus forms spatial distribution phosphorus equilibrium concentration phosphorus release risk

Received: 31 December 2021

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X171

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	TANG Jin-yong
	YIN Yue-peng
	CAO Xi
	ZHANG Yu
	ZHANG Wen

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TANG Jin-yong,YIN Yue-peng,CAO Xi等. Spatial distribution characteristics and release risk assessment of phosphorus forms in sediments: A case study of the Tuojiang River Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4264-4273.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4264

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