丹江口水库湿沉降物中氨的稳定同位素特征和来源

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Xiaoshu Chen , Tongqian Zhao , Chunyan Xiao , Xiaoming Guo , Xiaojun Nie , Guizhen Wang , Feihong Chen
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引用次数: 0

摘要

大气湿沉降物中的铵态氮(NHx)是水库型水源地的主要外部氮源,查明其来源对控制水体氮污染至关重要。本研究旨在考察 2019 年 9 月至 2020 年 8 月期间南水北调中线工程水源地丹江口水库淅川库区湿沉降中 NHx 的特征和来源。测量了降水中主要无机氮浓度和氨氮同位素(δ15N-NH4+)值,并利用贝叶斯混合模型分析了来源。结果表明,NH4+ 是湿沉降中主要的无机氮形式,浓度范围为 0.16-5.26 mg L-1。δ15N-NH4+值介于-14.7‰至+6.3‰之间,农业来源和气候条件对其有显著的同位素影响,显示出夏季值较高,冬季值较低。农业来源释放的氨(NH3)是 NHx 的主要来源(58.0%-76.6%),其中施肥是最主要的来源(32.1%-46.6%)。从季节上看,农业来源对湿沉降物中 NH4+ 的相对贡献在秋冬季节更高。从空间上看,农业活动极大地影响了整个库区的大气氮累积。这项研究量化了湿沉降中的 NHx 来源,为氮控制措施和大气氮循环研究提供了同位素证据和科学参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stable isotopic characterization and sources of ammonium in wet deposition at the Danjiangkou Reservoir

Ammonium nitrogen (NHx) in atmospheric wet deposition is a primary external nitrogen source for reservoir-type water sources, and identifying its sources is crucial for controlling nitrogen pollution in water. This study aimed to examine the NHx characteristics and sources in wet deposition in the Xichuan reservoir area of the Danjiangkou Reservoir, the South-to-North Water Diversion Project (SNWDP) water source, from September 2019 to August 2020. Major inorganic nitrogen concentrations in precipitation and ammonia-nitrogen isotope (δ15N–NH4+) values were measured, and the sources were analyzed using the Bayesian mixing model. The results showed that NH4+ was the main inorganic nitrogen form in wet deposition, with a concentration ranged of 0.16–5.26 mg L−1. The δ15N–NH4+ values ranged from −14.7‰ to +6.3‰, with significant isotopic effects from agricultural sources and climatic conditions, showing higher values in summer and lower values in winter. The release of ammonia (NH3) from agricultural sources was the primary NHx source (58.0%–76.6%), with fertilizer application being the most significant contributor (32.1%–46.6%). Seasonally, the relative contribution of agricultural sources to NH4+ in wet deposition was higher in autumn and winter. Spatially, agricultural activities significantly impacted atmospheric nitrogen accumulation across the reservoir area. This study quantified NHx sources in wet deposition, providing isotopic evidence and scientific references for nitrogen control measures and atmospheric nitrogen cycling studies.

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来源期刊
Atmospheric Pollution Research
Atmospheric Pollution Research ENVIRONMENTAL SCIENCES-
CiteScore
8.30
自引率
6.70%
发文量
256
审稿时长
36 days
期刊介绍: Atmospheric Pollution Research (APR) is an international journal designed for the publication of articles on air pollution. Papers should present novel experimental results, theory and modeling of air pollution on local, regional, or global scales. Areas covered are research on inorganic, organic, and persistent organic air pollutants, air quality monitoring, air quality management, atmospheric dispersion and transport, air-surface (soil, water, and vegetation) exchange of pollutants, dry and wet deposition, indoor air quality, exposure assessment, health effects, satellite measurements, natural emissions, atmospheric chemistry, greenhouse gases, and effects on climate change.
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