平原河网溶解无机氮来源的稳定同位素示踪——以温瑞塘河为例

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Abstract In this study, a representative plain river network in Zhejiang Province, namely Wen-Rui Tang River, was selected as the research area. The spatio-temporal variations and primary pollution sources of riverine dissolved inorganic nitrogen (DIN) were identified by combining multiple hydrochemical parameter with stable isotopes (δ¹⁵N/δ¹⁸O-NO₃^-, δ¹⁵N-NH₄⁺, δ¹⁸O-H₂O). On basis of these findings, a quantitative source apportionment method of DIN was developed by integrating nitrate and ammonia concentrations, their isotope compositions, and a SIAR model. Finally, the contributions of each pollution source to riverine DIN in Wen-Rui Tang River were calculated. Results revealed that the Wen-Rui Tang River exhibited severe DIN pollution with DIN concentrations ranging from 1.43mg/L to 12.88mg/L. Ammonia, nitrate and nitrite accounted for 63%, 35%, and 2% of DIN, respectively. Significant spatio-temporal variations of DIN content were observed in the Wen-Rui Tang River. Temporally, DIN concentrations followed the order: high flow season < usual flow season < low flow season. Spatially, DIN concentrations in mainstream were lower than those in tributaries and DIN concentrations in urban-rural segments were lower than those in urban segments. The predominant transformation process of DIN was nitrification rather than denitrification within the study area. The model results revealed that the contributions of manure and sewage, soil nitrogen, nitrogen fertilizer, and atmospheric deposition to DIN during the wet season were (71.29 ± 14.24)%, (18.96 ± 13.89)%, (6.78 ± 5.91)%, and (2.97 ± 2.28)%, respectively; during the usual flow season, these contributions accounted for (57.51 ± 15.53)%, (25.01 ± 16.45)%, (15.24 ± 8.19)%, and (2.25 ± 2.28)%, respectively; during the low flow season, they constituted (57.60 ± 16.27)%, (26.75 ± 17.58)%, (13.03 ± 7.95)% and (2.61 ± 2.55)%, respectively. Stronger uncertainties associated with soil nitrogen and manure and sewage contributions were found according to the uncertainty analysis.

Key words： plain river networks dissolved inorganic nitrogen stable isotopes pollution source apportionment SIAR model

Received: 25 May 2024

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X522

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	LIU Yin-li
	LIAO Zhong-lu
	WANG Peng-wei
	ZHAN Chen-can
	TAN Xin-min
	WANG Yu-hao
	MA Hao-xiang
	JI Xiao-liang

Cite this article:

LIU Yin-li,LIAO Zhong-lu,WANG Peng-wei等. Tracing dissolved inorganic nitrogen sources in plain river networks using stable isotopes: a case study of the Wen-Rui Tang River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6874-6885.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I12/6874

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