河口区养殖塘水-气界面N<sub>2</sub>O扩散通量比较

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Abstract The floating chamber technique (FC) and the diffusion model methods (DMs) are the two primary methods widely used for quantifying the fluxes of CO₂, CH₄ and N₂O across the water-atmosphere interface from aquatic ecosystems, while the comparability of two methods is largely unknown. In this study, FC and DMs models of gas transfer velocity were applied to determine N₂O fluxes in the aquaculture ponds in Min River Estuary, southeast China over aquaculture period (from June to November 2017). N₂O fluxes measured by FC and DMs changed in the ranges of (0.38±0.05)~(20.63±5.63)μg/(m²·h) and (2.77±0.52)~(17.23±2.27)μg/(m²·h), respectively. The temporal variations in N₂O fluxes measured by the two methods were similar, both showing a double-peak pattern during the study period. The N₂O fluxes were positively correlated to water temperature, NO₃^--N and NH₄⁺-N (P<0.05), but negatively correlated to the water dissolved oxygen (DO) concentration in the ponds (P<0.05). N₂O fluxes measured by different methods decreased in the order:DM_RC01>FC>DM_CL98>DM_W92a>DM_MY95>DM_CW03>DM_LM86.The correlation coefficient of N₂O fluxes between FC and DMs-RC01 was larger than those between FC and other methods. Our results suggested that the DM_RC01 model can be used to replace the FC for measuring N₂O fluxes in the aquaculture ponds in southeast China, with the lest cost of manpower and logistics.

Key words： nitrous oxide(N₂O) floating chamber method diffusion model method aquaculture ponds subtropical estuary

Received: 05 August 2020

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	TANG Chen
	YANG Ping
	ZHAN Peng-fei
	HE Qing-hua
	ZHAO Guang-hui
	YANG Hong
	LI Ling
	XU Jin
	TONG Chuan

Cite this article:

TANG Chen,YANG Ping,ZHAN Peng-fei等. Comparison of floating chamber and diffusion model methods in determining diffusive N₂O fluxes across water-atmosphere interface in estuary aquaculture ponds[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1074-1085.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1074

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