The evaluation of isoprene diffusion and emission processes from Quercus serrate forest

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Isoprene is the most abundant species of biogenic volatile organic compound. We used an automated chamber system and a proton-transfer-reaction mass spectrometer to detect nocturnal emissions of isoprene from three Quercus species. The rate of emission was greatest after sunset and decreased till dawn. It showed a linear relationship with temperature. It was higher in the upper canopy than in the lower canopy, and was higher under drought. In addition, spatial variation of isoprene concentration around forest shows the effectiveness of isoprene as a tracer to trace the diffusion process of the forest air. As global warming could increase nocturnal isoprene emissions worldwide, this study identifies the need for further study of nocturnal isoprene emissions under drought and heat stress.