流域溶解有机氮输出特征与迁移路径研究——以凤羽河流域为例

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Abstract In order to study the characteristics of dissolved organic nitrogen export in the watershed, continuous streamflow and water quality monitoring was carried out in the outlet of Fengyu River watershed in Eryuan County, Dali Bai Autonomous Prefecture, western Yunnan Province. The daily streamflow monitoring data and 777 water quality monitoring data were collected from January 2011 to December 2013. The LOADEST load estimation method and the base flow segmentation method were used to study the DON load export characteristics and hydrological transport pathways in the Fengyu River Basin. The results showed that: (1)The rainfall variation in flood season and non-flood season had a significant effect on the change of DON load export in the basin. (2) The results of DON load estimated by LOADEST model showed that the DON load in August was the most during a year, reaching 3110.6kg, followed by September and July, about 2604.9 and 2540.2kg, respectively, which indicated that the flood season is the critical period of DON loss. (3) The results of baseflow segmentation showed that the annual average contribution rate of baseflow DON to total DON load was 60.0%~96.0%, which indicated that the loss of DON in the Fengyu River Basin from 2011 to 2013 was mainly through baseflow. This study revealed the DON export characteristics and hydrological transport pathways through high-frequency monitoring of water quantity and quality at the watershed scale, which could provide references for watershed water quality protection and eutrophication prevention and control.

Key words： dissolved organic nitrogen(DON) Fengyu River Basin non-point source pollution LOADEST baseflow nutrients

Received: 11 October 2022

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X522

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	LIU Xin-ru
	DU Xin-zhong
	LEI Qiu-liang
	LIU Hong-bin

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LIU Xin-ru,DU Xin-zhong,LEI Qiu-liang等. Characteristics of watershed dissolved organic nitrogen export and its transport pathways - A case study of Fengyu River Watershed[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 309-316.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/IS1/309

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