College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Key Laboratory for Forest Silviculture and Conservation of Ministry of Education, Key Laboratory for Silviculture and Forest Ecosystem Research in Arid- and Semi-arid Region of State Forestry Administration, Research Center for Urban Forestry, Beijing Forestry University, Beijing 100083, China.
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Sci Total Environ. 2024 Jun 25;931:172944. doi: 10.1016/j.scitotenv.2024.172944. Epub 2024 May 1.
Air pollution poses a significant threat to public health, while biogenic volatile organic compounds (BVOCs) play a crucial role in both aspects. However, the unclear relationship between BVOCs and air pollutants in the under-canopy space limits the accuracy of air pollution control and the exploitation of forest healthcare functions. To clarify the variation of BVOCs in forest therapy bases, and their impacts on ozone (O) and fine particulate matter (PM) at nose height, total VOCs (TVOCs) in the forest were collected during typical sunny days, while air pollutants and meteorological factors were observed simultaneously. The results showed that the branch-level emissions of P. tabuliformis were dominated by healthcare-effective monoterpenoids, with only α-pinene having relative air concentrations of over 5 % in forest air samples. The correlation between concentrations of under-canopy TVOCs and emission rates of BVOCs from P. tabuliformis was weak (p > 0.09) in all seasons. However, the correlation between concentrations of TVOCs and the concentrations of O and PM showed clear seasonal differences. In spring, TVOCs only showed a significant negative correlation with PM in the forest (p < 0.01). In summer and autumn, TVOCs were significantly negatively correlated with both O (p < 0.001) and PM (p < 0.01). Specifically, the negative linear relationships were more pronounced for O and oxygenated VOCs in autumn (R = 0.40, p < 0.001) than for other relationships. The relationship between air pollutant concentrations inside and outside the forest also showed significant seasonal differences, generally characterized by a weaker correlation between them during seasons of strong emissions. Therefore, BVOCs in coniferous forests are health functions as they can provide healthcare effects and mitigate the concentration of air pollutants in the forest, and the establishment of forest therapy bases in rural areas with low NO can be a sensible approach to promote good health, well-being, and sustainable development.
空气污染对公众健康构成重大威胁，而生物源挥发性有机化合物（BVOCs）在这两个方面都起着至关重要的作用。然而，林内下垫面 BVOCs 与空气污染物之间的关系尚不清楚，限制了空气污染控制的准确性和森林保健功能的开发。为了阐明森林疗养基地中 BVOCs 的变化及其对近地面臭氧（O）和细颗粒物（PM）的影响，在典型晴天收集了森林中的总挥发性有机化合物（TVOCs），同时同步观测了空气污染物和气象因素。结果表明，油松的枝级排放以具有保健功效的单萜烯类为主，只有α-蒎烯在林内空气样本中的相对空气浓度超过 5%。所有季节下，林内下垫面 TVOCs 浓度与油松 BVOCs 排放速率之间的相关性均较弱（p>0.09）。然而，TVOCs 浓度与 O 和 PM 浓度之间的相关性具有明显的季节性差异。在春季，TVOCs 仅在森林中与 PM 呈显著负相关（p<0.01）。在夏季和秋季，TVOCs 与 O（p<0.001）和 PM（p<0.01）均呈显著负相关。具体而言，在秋季，O 和含氧挥发性有机物的负线性关系更为显著（R=0.40，p<0.001），强于其他关系。林内外空气污染物浓度之间的关系也具有明显的季节性差异，通常在排放较强的季节，它们之间的相关性较弱。因此，针叶林的 BVOCs 具有健康功能，因为它们可以提供保健效果并减轻森林中空气污染物的浓度，在低 NO 的农村地区建立森林疗养基地是促进健康、幸福和可持续发展的明智方法。
