摘要
为研究流域溶解性有机氮的输出特征,在云南省西部大理白族自治州洱源县的凤羽河流域出口进行了水质水量连续监测,收集了2011年1月-2013年12月连续的逐日水量监测数据和777个的水质监测数据.采用了LOADEST负荷估算方法和基流分割方法研究了凤羽河流域DON输出特征与水文迁移路径.结果表明:(1)汛期与非汛期降雨量的变化对流域DON负荷的输出变化影响显著;(2) LOADEST负荷估算结果表明8月份DON负荷流失最多,达到3110.6kg,其次分别为9和7月,约2604.9和2540.2kg,表明汛期为DON负荷流失的关键期;(3)基流分割结果表明基流输出DON占流域DON总负荷的60.0%~96.0%,从而表明2011~2013年凤羽河流域DON的流失途径主要是基流.
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.
作者
刘新茹
杜新忠
雷秋良
刘宏斌
LIU Xin-ru;DU Xin-zhong;LEI Qiu-liang;LIU Hong-bin(Key Laboratory of Nonpoint Source Pollution Control,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Ministry of Agriculture and Rural Affairs,Beijing 100086,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期309-316,共8页
China Environmental Science
基金
国家重点研发计划(2022YFC3204001)
国家自然科学基金项目(42107076,U20A20114)
