Wet Inorganic Nitrogen Deposition at the Daheitin Reservoir in North China: Temporal Variation, Sources, and Biomass Burning Influences
Wet Inorganic Nitrogen Deposition at the Daheitin Reservoir in North China: Temporal Variation, Sources, and Biomass Burning Influences
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华北大黑亭水库湿无机氮沉降：时间变化、来源和生物质燃烧影响
DOI：
10.3390/atmos11111260
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发表时间：
2020-11
期刊：
影响因子：
2.9
通讯作者：
Linlin Liang
中科院分区：
文献类型：
--
作者：
Leixiang Wu;Xiaobo Liu;Kun Li;Wanyun Xu;Wei Huang;Panwei Zhang;Xiaohui Zhao;Chang Liu;Gen Zhang;Linlin Liang
大气氮沉降对空气质量和生态系统都非常重要，特别是在中国北方，覆盖了中国四分之一的耕地，并且有许多空气污染严重的城市。为了解我国北方农村湿氮沉降特征，在大黑亭库区采集了一年的湿沉降样品。由于冷季采暖活动导致气态氮化合物排放强烈，且不同降雨强度和频率下的稀释效应明显，导致湿氮沉降体积加权平均浓度呈现旱季较高、雨季较低的趋势。相比之下，湿氮沉降率随降水量的变化而变化，即雨季高，旱季低。 2019年7月至2020年6月华北农村地区总无机离子（NO3−–N和NH4+–N之和）年湿沉降率为18.9 kg N ha−1 yr−1，仍处于较高水平。此外，生物质燃烧活动在中国普遍存在，特别是在中国北方；然而，对其对湿氮沉降影响的研究有限。采用非海盐钾离子（nss-K+）作为分子示踪剂，研究生物质燃烧活动的特征及其对湿氮沉降化学性质的影响。在收获季节（6 月至 7 月）捕获了 3 次 nss-K+ 水平较高的降水事件。 nss-K+、沉积N形态、nss-K+与氮形态的比值及其关系的变化均表明生物质燃烧排放对NO3−N贡献显着，而对NH4+–N影响较小。
Atmospheric nitrogen deposition is of great concern to both air quality and the ecosystem, particularly in northern China, which covers one-quarter of China’s cultivated land and has many heavily air polluted cities. To understand the characteristics of wet N deposition at rural sites in northern China, one-year wet deposition samples were collected in the Daheitin reservoir region. Due to the intense emissions of gaseous nitrogen compounds from heating activities during cold seasons and distinct dilution effects under different rainfall intensities and frequencies, the volume weighted mean concentrations of wet N deposition showed higher levels in dry seasons but lower levels in wet seasons. In contrast, the wet N deposition rates varied consistently with precipitation, i.e., high during the wet season and lower during the dry season. The annual wet deposition rate of total inorganic ions (the sum of NO3−–N and NH4+–N) at the rural site in North China from July 2019 to June 2020 was observed at 18.9 kg N ha−1 yr−1, still remained at a relatively high level. In addition, biomass burning activities are ubiquitous in China, especially in northern China; however, studies on its impact on wet N deposition are limited. Non-sea salt potassium ion (nss-K+) was employed as a molecular tracer to investigate the characteristics of biomass burning activities as well as their impact on the chemical properties of wet N deposition. Three precipitation events with high nss-K+ levels were captured during the harvest season (June to July). The variations in the patterns of nss-K+, deposited N species, and ratios of nss-K+ to nitrogen species as well as their relationships all indicated that biomass burning emissions contributed remarkably to NO3−–N but had a minor influence on NH4+–N.
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