The forests of the boreal and mid-latitude zones of the Northern Hemisphere are the largest source of reactive volatile organic compounds (VOCs), which have an important impact on the processes occurring in the atmospheric boundary layer. However, the composition of biogenic emissions from them remains incompletely characterized, as evidenced by the significant excess OH radical concentrations predicted by models in comparison with those observed under the forest canopy. The missing OH sink in the models may be related to the fact that they do not take into account the emission of highly reactive VOCs by vegetation on the forest floor. In this work, we report the results of laboratory determinations of the composition of VOCs emitted by representatives of different groups of plants that form the living soil cover (LSC) in the forests of the boreal and mid-latitude zones: bryophytes, small shrubs, herbaceous plants, and ferns. In the chromatograms of volatile emissions of all 11 studied plant species, 254 compounds with carbon atoms ranging in number from two to 20 were registered. All plants were characterized by the emission of terpenes, accounting for 112 compounds, and the second largest group (35 substances) was formed by carbonyl compounds. Both groups of compounds are characterized by high reactivity and are easily included in the processes of gas-phase oxidation with the participation of radicals HO, NO₃ and ozone. These data indicate the importance of a thorough study of the so far disregarded source of VOCs, that is, the LSC in forests.

北半球北方和中纬度地区的森林是反应性挥发性有机化合物（VOCs）的最大来源，对大气边界层中发生的过程具有重要影响。然而，它们的生物排放成分仍未完全表征，模型预测的 OH 自由基浓度与在森林冠层下观察到的浓度相比显着过剩就证明了这一点。模型中缺少的 OH 汇可能与它们没有考虑森林地面植被释放的高活性 VOCs 的事实有关。在这项工作中，我们报告了在北方和中纬度地区的森林中形成活土壤覆盖 (LSC) 的不同植物群的代表排放的 VOC 成分的实验室测定结果：苔藓植物、小灌木、草本植物和蕨类植物。在所有 11 种研究植物的挥发性排放物色谱图中，登记了 254 种碳原子数从 2 到 20 不等的化合物。所有植物都以释放萜烯为特征，共有 112 种化合物，第二大类（35 种物质）由羰基化合物组成。两组化合物都具有高反应性的特点，很容易被包括在自由基 H2O、NO 参与的气相氧化过程中。在所有 11 种研究植物的挥发性排放物色谱图中，登记了 254 种碳原子数从 2 到 20 不等的化合物。所有植物都以释放萜烯为特征，共有 112 种化合物，第二大类（35 种物质）由羰基化合物组成。两组化合物都具有高反应性的特点，很容易被包括在自由基 H2O、NO 参与的气相氧化过程中。在所有 11 种研究植物的挥发性排放物色谱图中，登记了 254 种碳原子数从 2 到 20 不等的化合物。所有植物都以释放萜烯为特征，共有 112 种化合物，第二大类（35 种物质）由羰基化合物组成。两组化合物都具有高反应性的特点，很容易被包括在自由基 H2O、NO 参与的气相氧化过程中。₃、臭氧。这些数据表明了对迄今为止被忽视的 VOC 来源进行彻底研究的重要性，即森林中的 LSC。