河海大学学报（自然科学版）2025，Vol.53Issue(4)：47-55,98,10.DOI:10.3876/j.issn.1000-1980.2025.04.006
赣抚平原灌渠水体硝酸盐同位素组成与来源识别
Nitrate isotope compositions and source identification in irrigation canal water bodies of the Ganfu Plain
摘要
Abstract
To identify the sources of nitrate in irrigation canal water bodies of the Ganfu Plain,pH,electrical conductivity,concentrations of dissolved oxygen and NO3-,and nitrate isotope compositions(δ15N-NO3-and δ18O-NO3-)in the West Main Canal of the Ganfu Plain during spring and autumn were analyzed.The contributions of the main pollution sources were quantitatively analyzed using the stable isotope analysis in R model based on Bayesian mixing(MixSIAR model).The results show that the nitrification in water bodies of the West Main Canal is slightly stronger in autumn than in spring but is overall weak in the two seasons,and denitrification is almost not observed.The sources of NO3-in water bodies of the West Main Canal mainly include the upstream water,ammonium-nitrogen fertilizer,soil nitrogen,domestic sewage and manure,as well as precipitation.The upstream water(with a contribution rate of greater than 50％)and human activities(including the ammonium-nitrogen fertilizer,domestic sewage,and manure,with a contribution rate of greater than 37％)play a dominant role in the NO3-concentration in the entire irrigation canal water body.The contribution rates of pollution sources to NO3-in the irrigation canal water body in descending order are as follows:upstream water,ammonium-nitrogen fertilizer,domestic sewage and manure,soil nitrogen,precipitation in autumn,and ammonium-nitrogen fertilizer,upstream water,domestic sewage and manure,soil nitrogen,precipitation in spring.In addition,the contribution of NO3-sources is associated with land use patterns.The contribution rates of upstream water and domestic sewage and manure show upward trends from rural to urban areas,while the contribution rate of ammonium-nitrogen fertilizer shows an opposite change.关键词
赣抚平原/灌渠水体/氨氮同位素组成/MixSIAR模型/污染源识别Key words
the Ganfu Plain/irrigation canal water body/ammonium-nitrogen isotope composition/MixSIAR model/pollution source identification分类
资源环境引用本文复制引用
宋祉君,饶文波,吴志华,栗天宁,张弛,雷祥..赣抚平原灌渠水体硝酸盐同位素组成与来源识别[J].河海大学学报（自然科学版）,2025,53(4):47-55,98,10.基金项目
江西省水利厅科技项目(202223YBKT34) （202223YBKT34）
