长河流域枯水期水体硝酸盐源解析  

Analysis of Nitrate Sources in Water in the Changhe River Basin during Dry Season

作　　者：雍亮 冯民权[1,2] 范锐谦 YONG Liang;FENG Minquan;FAN Ruiqian(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi′an University of Technology,Xi′an 710048,China;Department of municipal and environmental engineering,Xi′an University of Technology,Xi′an 710048,China;Shanxi Fenhe River Basin Management Co.,Ltd,Taiyuan 030002,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]西安理工大学市政与环境工程系,西安710048 [3]山西汾河流域管理有限公司,太原030002

出　　处：《地球与环境》2023年第3期274-286,共13页Earth and Environment

基　　金：国家自然科学基金项目(51679191);晋城市水利科技项目(2021.12)。

摘　　要：通过识别研究区枯水期地表水和浅层地下水中溶解态无机氮(DIN)的分布特征,结合硝酸盐稳定同位素技术与水化学方法,并利用贝叶斯稳定同位素混合模型(SIAR),定量解析长河流域水体硝酸盐污染源,为流域水生态环境的修复治理提供理论支持。结果显示,研究区枯水期水体溶解态无机氮(DIN)以NO_(3)^(-)-N为主,NO_(3)^(-)-N平均占比为91.56%;水体生物地球化学过程以硝化作用为主;硝酸盐主要来自粪便和污水;SIAR模型计算结果表明,粪便和污水、土壤氮、化肥、大气沉降对研究区地表水硝酸盐的贡献比例分别为40.80%、30.60%、25.60%和3.00%;对浅层地下水硝酸盐的贡献比例分别为39.92%、32.11%、25.87%和2.10%。研究显示,人类活动对研究区水体影响强烈,加强排污设施基础建设,改善污水排放现象,是减少区域氮污染的关键因素。Sources of nitrate pollution in Changhe River Basin were infered by identifying distribution characteristics of dissolved inorganic nitrogen(DIN)in surface water and shallow groundwater during the dry season,combining nitrate stable isotope techniques,hydrochemical methods and the Bayesian stable isotope mixing model(SIAR).It will provide theoretical support for the restoration and management of the aquatic ecological environment in the basin.The results indicated:the DIN in water during dry season was dominated by NO_(3)^(-)-N,and the average proportion of NO_(3)^(-)-N was 91.56%.Nitrification was the main biogeochemical process that occurred in water,and the nitrate mainly came from feces and sewage.The results of SIAR model showed that the contributions of the nitrate in surface water came from the manure and sewage,soil nitrogen,fertilizer and atmospheric deposition were 40.65%,30.96%,25.40%and 2.99%,respectively;for the groundwater,which were 41.58%,30.46%,25.25%and 2.71%,respectively.Studies showed that human activities had a strong impact on the water bodies in the study area.Strengthening the infrastructure construction of sewage facilities and improving sewage discharge are the key factors to reduce regional nitrogen pollution.

关 键 词：溶解态无机氮 同位素 SIAR 长河流域 

分 类 号：X523[环境科学与工程—环境工程]