冰封期湖泊沉积物-水界面氮磷迁移及源汇特征

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Abstract Based on the in-situ high-resolution Diffusive Gradients in Thin-films (DGT), the study aimed at analyzing the spatial distribution of key nutrient elements (N and P) at the submillimeter scale and their source & sink characteristics. Our findings indicate that the concentrations of DGT-NH₄⁺-N and NO₃^--N in overlying water were higher than those in sediments during frozen period, whereas liable P demonstrated a contrasting trend. Under the sediment-water interface, liable N and P showed different distribution characteristics. The concentrations of NH₄⁺-N and NO₃^--N gradually decreased with the increase of sediment depth, and P concentration firstly increased and then decreased with the increased sediment depth. The average exchange fluxes of NH₄⁺-N and NO₃^--N in Chagan Lake were -0.135 and -0.333mg/(m²·d) respectively, showing the features of “Sink”; the average exchange fluxes of P was 0.084mg/(m²·d), showing the features of “Source”. Redundancy Analysis (RDA) showed that dissolved oxygen explained 32.8% of nitrogen and phosphorus release fluxes at sediment-water interface (P<0.05). Through estimating the contribution rate of overlying water, we found that the diffusion of P nutrients in sediment played a great role on the overlying water, and the contribution rate of individual sampling points reached 2,297%, possibly due to the presence of local micro-niches.

Key words： Chagan Lake frozen period sediment-water interface diffusive gradients in thin-films diffusive flux dissolved oxygen

Received: 25 November 2022

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X524

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	ZHU Yin-ze
	ZHAO Ke
	DONG Xiang-qian
	ZHANG Jing-han
	WANG Qi-chen
	WANG Ying-xue
	TIAN Xue
	YUAN Yu-xiang
	ZHU Xiao-yan

Cite this article:

ZHU Yin-ze,ZHAO Ke,DONG Xiang-qian等. Characterizing Nitrogen and Phosphorus Transport and Source-Sink Interactions at the Lake Sediment-Water Interface During the Freezing Period[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3616-3624.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3616

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