冬季大黑汀水库沉积物-水界面氮磷赋存特征及交换通量

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Abstract In this paper, the pollution load and distribution characteristics of carbon, nitrogen and phosphorus in surface sediments of Daheiting Reservoir were studied. The characteristics of nitrogen and phosphorus profiles at the sediment-water interface were obtained by pore water equilibriums technology, and the spatial differences of NH₄⁺-N and PO₄^3－-P in the interstitial water of Daheiting Reservoir were analyzed. The results showed that the contents of TN, TP and TOC in sediments were 729~5894mg/kg, 1312~2439mg/kg and 0.5%~5.6%, respectively. The contents of NH₄⁺-N, NO₃^－-N, NO₂^－-N and PO₄^3－-P in sediments were 0.6~202.9, 34.4~168.3, 0.1~0.3 and 16.1~75.2mg/kg, respectively, and the spatial distribution was significantly different. Sediment C/N ratio indicated that the substances inwater were the source of organic matter because of human cage culture activities. The concentration of NH₄⁺-N and PO₄^3－-P in the interstitial water was much higher than that in the overlying water, indicated that nutrients have the potential to diffuse from interstitial water to overlying water. In the vertical direction, the concentration of NH₄⁺-N in interstitial water increases with depth, and PO₄^3－-P increases rapidly at 0~4cm, then decreases gradually. The exchange fluxes of NH₄⁺-N and PO₄^3－-P across the sediment-water interface were 3.5~110.5mg/(m²·d) and 0.1~1.6mg/(m²·d), respectively. The exchange fluxes of NO₃^－-N and NO₂^－-N were -112.5~157.2mg/(m²·d) and 0.04~0.94mg/(m²·d), respectively. NH₄⁺-N, NO₃^－-N and PO₄^3－-P showed higher exchange fluxes downstream. Higher sediment endogenous load made the sediments of Daheiting Reservoir have greater potential to release nutrients to overlying water,so controlling the pollution state of sediment is a necessary measure to manage the water environment of Daheiting Reservoir.

Key words： Daheiting Reservoir nutrients sediment-water interface interstitial water diffusive flux

Received: 23 July 2018

PACS:

X142

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	WEN Shuai-long
	WU Tao
	YANG Jie
	LI Xin
	GONG Wan-qing
	ZHONG Ji-cheng

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WEN Shuai-long,WU Tao,YANG Jie等. Distribution characteristics and exchange flux of nitrogen and phosphorus at thesediment-water interface of Daheiting Reservoir in winter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1217-1225.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1217

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