High levels of primary biogenic organic aerosols in the atmosphere in summer are driven by only a few microbial taxa from the leaves of surrounding plants
High levels of primary biogenic organic aerosols in the atmosphere in summer are driven by only a few microbial taxa from the leaves of surrounding plants
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DOI：
10.5194/acp-2019-1147
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发表时间：
2020-01
影响因子：
6.3
通讯作者：
A. Samaké;A. Bonin;J. Jaffrezo;P. Taberlet;Samuël Weber;G. Uzu;V. Jacob;S. Conil;J. Martins
中科院分区：
文献类型：
--
作者：
A. Samaké;A. Bonin;J. Jaffrezo;P. Taberlet;Samuël Weber;G. Uzu;V. Jacob;S. Conil;J. Martins
摘要。原生生物源有机气溶胶（PBOA）是空气中粗有机质（OM）的主要组成部分。尽管它们与许多大气过程和人类健康问题有关，但令人惊讶的是，我们对PBOA的特征（即组成、主要来源和对空气中颗粒的贡献）知之甚少。此外，特定的原糖化合物（SCs）通常被用作与细菌和真菌相关的PBOA的标记物，但我们对与大气颗粒物（PM）相关的微生物群落的了解仍然不完整。这项工作旨在全面了解PM10（小于10µm的颗粒）中与SCs相关的微生物指纹及其在周围环境（土壤和植被）中的主要来源。对法国某农业区农村背景点采集的PM10进行了深入研究。我们将细菌和真菌的高通量测序与PM10、土壤和植物样本的详细理化特征结合起来，并在整个采样期间监测气象和农业活动。结果表明，夏季PM10中的sc是空气中OM的主要贡献者，占OM质量的0.8% ~ 13.5%。SCs浓度显然是由少数特定的空气中真菌和细菌分类群的丰度决定的。这些微生物在叶片中的含量明显高于土壤样品。有趣的是，在PM10和叶片样品中，细菌和真菌的整体群落结构相似，而在PM10和土壤样品中差异显著，表明周围植被是农村PM10中sc相关微生物类群的主要来源。
Abstract. Primary biogenic organic aerosols (PBOA) represent a major fraction of coarse organic matter (OM) in air. Despite their implication in many atmospheric processes and human health problems, we surprisingly know little about PBOA characteristics (i.e., composition, dominant sources, and contribution to airborne-particles). In addition, specific primary sugar compounds (SCs) are generally used as markers of PBOA associated with Bacteria and Fungi but our knowledge of microbial communities associated with atmospheric particulate matter (PM) remains incomplete. This work aimed at providing a comprehensive understanding of the microbial fingerprints associated with SCs in PM10 (particles smaller than 10 µm) and their main sources in the surrounding environment (soils and vegetation). An intensive study was conducted on PM10 collected at rural background site located in an agricultural area in France. We combined high-throughput sequencing of Bacteria and Fungi with detailed physicochemical characterization of PM10, soils and plant samples, and monitored meteorology and agricultural activities throughout the sampling period. Results shows that in summer SCs in PM10 are a major contributor of OM in air, representing 0.8 to 13.5 % of OM mass. SCs concentrations are clearly determined by the abundance of only a few specific airborne Fungi and Bacteria Taxa. These microbial are significantly enhanced in leaf over soil samples. Interestingly, the overall community structure of Bacteria and Fungi are similar within PM10 and leaf samples and significantly distinct between PM10 and soil samples, indicating that surrounding vegetation are the major source of SC-associated microbial taxa in PM10 in rural area.