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  

Characteristics of watershed dissolved organic nitrogen export and its transport pathways-A case study of Fengyu River Watershed

作　　者：刘新茹 杜新忠 雷秋良[1] 刘宏斌[1] 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)

机构地区：[1]中国农业科学院农业资源与农业区划研究所农业农村部面源污染控制重点实验,北京100086

出　　处：《中国环境科学》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)

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.

关 键 词：溶解性有机氮(DON) 凤羽河流域 面源污染 LOADEST 基流分割 营养盐 

分 类 号：X522[环境科学与工程—环境工程]