黑碳細懸浮微粒對森林環境影響的研究在大氣及森林環境科學領域是非常重要的課題。本研究的目的是監測溪頭森林環境中黑碳細懸浮微粒濃度的季節變動，比較平日及假日黑碳總質量、生質燃燒及車輛排放濃度的24小時變化趨勢。並探討黑碳細懸浮微粒的來源及對人體健康的影響。2017年在溪頭實驗林開展春夏秋冬四季觀測。結果顯示春季黑碳細懸浮微粒濃度最高，月平均的黑碳總質量、生質燃燒及車輛排放濃度分別為1.71 μg m⁻³、0.32 μg m⁻³及1.39 μg m⁻³，車輛排放濃度約佔81%大於生質燃燒的19%，顯示八成以上的黑碳是車輛排放所供應。黑碳總質量及生質燃燒濃度大小順序均為春季>冬季>秋季>夏季；車輛排放濃度大小順序為春季>秋季>冬季>夏季。在車輛排放濃度方面，春季以週末的月平均濃度最高(1.67 μg m⁻³)，其次是平日(1.35 μg m⁻³)及週日(1.29 μg m⁻³)，顯示春季溪頭週末車輛排放的黑碳汙染最高，值得特別注意。以上結果顯示，黑碳細懸浮微粒影響森林環境品質，交通污染對溪頭森林環境的影響必須受到重視，以尋求進一步的解決方案。未來會持續觀測分析變化趨勢，做為未來溪頭園區管理者對遊客人數管制的參考。

Impact of fine particulate matter of black carbon (BC) on forest environment is an important emerging area of atmospheric and forest environmental sciences. The aim of this study was to monitor seasonal variation of BC concentrations in the Xitou forest environment, to compare 24-hour change trend of average concentrations of BC mass, biomass burning and vehicle emission during weekdays versus holidays, and to discuss sources of BC fine particulate matter and impact on human health. Four seasonal campaigns were conducted at the Xitou Experimental Forest in 2017. The results showed that BC fine particulate matter was high in spring, average monthly concentration of BC mass, biomass burning, and vehicle emission were 1.71 μg m⁻³、0.322 μg m⁻³及1.39 μg m⁻³, respectively. The vehicle emission concentration was about 81% higher than 19% of the biomass burning, indicating that more than 80% of BC black fine particulate matter was from vehicle emissions. BC mass and biomass burning concentrations showed a seasonal variation trend as spring > winter > autumn > summer; while vehicle emission concentrations seasonal variation trend as spring > autumn > winter > summer. The average monthly concentration of vehicle emissions in spring was higher on Saturdays (1.67 μg m⁻³) than on weekdays (1.35 μg m⁻³) and on Sundays (1.29 μg m⁻³). This indicated that BC pollutant from vehicle emission on Saturdays was the highest, which deserves special attention. The above results showed that BC fine particulate matter affect the quality of forest environment, and we should take the issue of traffic pollution on forest environment in Xitou seriously and seek solutions. In the future, we will keep monitoring the BC fine particulate matter f to provide references for Xitou managers for controlling the number of tourists.