Ambient volatile organic compound (VOC) concentrations including individual monoterpenoids, sesquiterpenes (SQTs), isoprene, 2-methyl-3-buten-1-ol (MBO), methacrolein (MACR), C₅–C₁₀ aldehydes, benzene and toluene were measured in a coniferous forest in Hyytiälä, southern Finland, in April–November 2016 with 1–2 h time resolution. Positive matrix factorization (PMF) was used to resolve the major sources which were responsible for the observed ambient VOC concentrations. The most reliable results were obtained with a 10 factor solution including four anthropogenic and six biogenic sources. Three of the biogenic factors were induced by light. They were either light dependent emissions or products of photochemical reactions. Three factors appeared to be temperature dependent emissions. Biogenic emissions were clearly the most important source of the measured VOCs, but the contribution from a local sawmill was also significant. About half of the monoterpenes (MTs) could be appointed to Scots pine emissions, but the influence from the activities at a near-by sawmill and Norway spruce emissions were also found. In the case of some individual MTs (e.g. limonene), spruce emissions dominated. Spruce emissions were also mainly responsible for ambient SQTs, aldehydes, and isoprene. For anthropogenic compounds, benzene and toluene, background, and local activities were the main sources. PMF was useful in resolving the sources of ambient VOCs.

环境挥发性有机化合物 (VOC) 浓度，包括单个单萜、倍半萜 (SQT)、异戊二烯、2-methyl-3-buten-1-ol (MBO)、甲基丙烯醛 (MACR)、C ₅ –C ₁₀2016 年 4 月至 11 月，在芬兰南部 Hyytiälä 的针叶林中测量了醛、苯和甲苯，时间分辨率为 1-2 小时。正矩阵分解 (PMF) 用于解析导致观察到的环境 VOC 浓度的主要来源。最可靠的结果是使用 10 因子解决方案获得的，其中包括四个人为来源和六个生物来源。其中三种生物因子是由光诱导的。它们要么是依赖光的排放物，要么是光化学反应的产物。三个因素似乎与温度相关的排放。生物排放显然是测量到的 VOC 的最重要来源，但当地锯木厂的贡献也很大。大约一半的单萜 (MTs) 可以指定用于苏格兰松树的排放，但也发现了附近锯木厂活动和挪威云杉排放的影响。在某些单独的 MT（例如柠檬烯）的情况下，云杉排放占主导地位。云杉的排放也是环境 SQT、醛和异戊二烯的主要原因。对于人为化合物，苯和甲苯、背景和当地活动是主要来源。PMF 可用于解析环境 VOC 的来源。