外源碳氮输入对沟道底泥反硝化潜势与阈值影响——以宁夏引黄灌区排水沟为研究对象

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Abstract In this study, laboratory incubation experiments were conducted for sediment denitrification potential study in farmland ditches of the Yellow River Diversion Irrigation Area of Ningxia. Experiments were conducted under condition of four exogenous nitrogen concentration gradients of 0, 5, 10, 20mg/L and two exogenous carbon concentration gradients of 0 and 100mg/L in the overlying water. The NO₃^--N, NH₄⁺-N, and DOC concentration of the overlying water were measured as well as denitrification rates during 47days of incubation to evaluate the denitrification potential and its threshold. The results showed that sediment denitrification increased with the increase of exogenous nitrogen and of carbon. The NO₃^--N concentration of the overlying water decreased with the time (P<0.01), but the concentration of NO₃^--N in the overlying water decreased significantly with the addition of exogenous carbon compared with the condition without carbon source (P<0.05). At the end of the experiment, NO₃^--N concentration decreased by 52.1% and 93.6% respectively without and with carbon sources. Under the condition of adding carbon source, the concentration of NO₃^--N in the overlying water stabilized to a low level at 20d, while the concentration of NO₃^--N in the treatment without carbon source addition still had a large decreasing space after 47d of the incubation. The thresholds of denitrification removal rate in sediment without carbon source and with carbon source were 263.7 and 865.6µmol/L, respectively. The ratio of cumulative nitrogen removal to total nitrogen in the culture column system increased with the increase of exogenous nitrogen and carbon source (P<0.05), denitrification process could remove 10.3%~11.4% of nitrogen in the culture column system without exogenous carbon, but increased to 17.7%~37.3% with the exogenous carbon addition. In conclusion, This study can provide scientific basis for efficient control of agricultural non-point source pollution in the irrigated area of Yellow River diversion.

Key words： denitrification channel denitrification exogenous carbon and nitrogen nitrogen removal

Received: 16 May 2022

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X52

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	Articles by authors
	ZHAO Jun-han
	SHE Dong-li
	GE Jia-min
	SHAN Jun
	PAN Yong-chun
	XIA Yong-qiu
	HONG Yu

Cite this article:

ZHAO Jun-han,SHE Dong-li,GE Jia-min等. Impact on denitrification potential and threshold of ditches sediment with exogenous carbon and nitrogen addition: A case of ditches in Ningxia Yellow River Irrigation area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5856-5863.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5856

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