Abstract: Biogenic volatile organic compounds (BVOCs) are secondary metabolites of plants that play various ecological roles, such as defense and signaling. They have become a popular topic in environmental and ecological studies. Nitrogen deposition is a dual factor of nutrient and environmental stress for plants that alters the emission of plant defense-related BVOCs (dBVOCs). It affects inter-species communication, their survival and development, and structure and function of the entire ecosystem. However, relevant research is limited. In this study, we focused on three types of dBVOCs, namely, terpenes, green leaf volatiles, and methyl salicylate, and elucidated their main components, synthesis pathways, ecological functions, and responses to various biotic and abiotic stressors. We further examined the impact of nitrogen deposition on these dBVOCs, exploring their response trends and related mechanisms under nitrogen–phosphorus limitation. Future research is necessary to deepen and expand the understanding of dBVOCs by uncovering their underlying mechanisms. Additionally, efforts should be made to overcome the challenges in research methods and detection devices for dBVOCs and strengthen interdisciplinary collaboration. Such advancements can provide theoretical support for tree planting management, green pest prevention and control, and promotion of sustainable development in the context of global changes.

Key words: dBVOCs, terpenes, green leaf volatiles, methyl salicylate, plant stress, nitrogen deposition