泥炭地森林池塘大气挥发性有机化合物的净排放量

IF 3.7 1区 地球科学 Q1 LIMNOLOGY
Yinghuan Qin, Kajsa Emilia Roslund, Amy Samantha Smart, Jesper Riis Christiansen, Riikka Rinnan
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引用次数: 0

摘要

小水体在全球碳排放中的作用日益得到承认。淡水生态系统,特别是小水体,除了已得到充分研究的温室气体二氧化碳(CO2)和甲烷外,还可能排放挥发性有机化合物(VOCs),但所排放的VOCs的组成和排放量在很大程度上仍未得到描述。参考淡水温室气体的主要贡献者,我们评估了丹麦泥炭地森林中三个富含碳和养分的池塘的季节性VOC排放。这些池塘在整个采样期间(19.5±67.7至396.8±120.0 mg m−2 h−1)都是CO2排放源。现场测得的C5 VOCs总净通量范围为7.8±1.4 ~ 95.3±4.5 μg m−2 h−1,检测到100多种化合物。排放物主要包括碳氢化合物、含氧挥发性有机化合物和萜类化合物(异戊二烯、单萜类和倍半萜类)。发现原位VOC通量和组成随季节变化,与室内温度呈正相关。这些通量在池塘之间也有所不同,并与池塘水的化学性质有关。此外,我们在补充的实验室测量中观察到大量和各种较轻的VOC (< C5)和含硫/含氮化合物的排放,并再次证明了VOC排放的温度依赖性和池与池之间的异质性。总体而言,我们的研究结果表明,天然富营养化池塘是VOC的净来源。这些排放对碳预算和大气影响的重要性需要未来的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Net emission of atmospheric volatile organic compounds from ponds in a peatland forest
The role of small water bodies in global carbon emissions is increasingly acknowledged. In addition to the well‐investigated greenhouse gases, carbon dioxide (CO2) and methane, volatile organic compounds (VOCs) may be emitted from freshwater ecosystems, especially from small water bodies, but the composition of emitted VOCs and emission magnitudes remain largely undescribed. Referring to empirical great contributors of freshwater greenhouse gases, we assessed seasonal VOC emissions from three carbon and nutrient‐rich ponds in a peatland forest in Denmark. These ponds were CO2 emitters throughout the sampling period (19.5 ± 67.7 to 396.8 ± 120.0 mg m−2 h−1). The total net fluxes of > C5 VOCs measured in situ ranged from 7.8 ± 1.4 to 95.3 ± 4.5 μg m−2 h−1 and over one hundred compounds were detected. The emissions consisted mainly of hydrocarbons, oxygenated VOCs, and terpenoids (isoprene, monoterpenoids, and sesquiterpenoids). We found the in situ VOC fluxes and compositions varied with season and were positively correlated with chamber temperature. These fluxes also differed between ponds and were related to the chemical properties of pond water. Additionally, we observed emissions of significant and various lighter VOCs (< C5) and sulfur/nitrogen‐containing compounds in complementary lab measurements and demonstrated again the temperature dependence and pond‐to‐pond heterogeneity of VOC emissions. Overall, our findings indicate natural eutrophic ponds are net VOC sources. The significance of these emissions for carbon budgets and atmospheric impact requires future research.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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