降水驱动下大港河硝酸盐迁移转化过程及来源解析

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Abstract To explore the sources and transformation of surface water nitrate in Dagang River Basin, we defined eight sampling points from the upstream to downstream along the Dagang River from which samples of surface water and sediment were collected when precipitation occurred in autumn (November 2020) and spring (March 2021). A total of 20 samples of groundwater, sewage, manure and soils were analyzed with hydrogeochemistry, nitrogen and oxygen isotope tracer technology, and Bayesian mixture model. Results show that:(1) the total nitrogen (TN) concentration of surface water was 3.20mg/L in the autumn and 3.23mg/L in the spring (70.9% in the form of NO₃^--N), which was higher than the environmental quality of surface water V standard; (2) nitrogen cycling process in the Dagang River Basin was dominated by nitrification, while precipitation led to the seasonal changes in nitrate concentration; (3) domestic wastewater and livestock manure were two main sources of nitrate to the watershed waters, collectively contributing (40.8%±32.8%) in the autumn and (55.8%±27.3%) in the spring, followed by groundwater and soils, while the least by precipitation.

Key words： rainfall Dagang River Basin nitrogen and oxygen isotopes sources of nitrate Bayesian mixture model source identification

Received: 20 June 2023

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X171

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	WANG Jun
	KANG Xiao-qi
	WU Ya-li
	NIU Yuan
	YU Hui

Cite this article:

WANG Jun,KANG Xiao-qi,WU Ya-li等. Identification of nitrate sources and transformations during precipitation processes in Dagang River basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 288-299.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/288

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