Moreover, Moso bamboo has a wide distribution and a large planting area. Moso bamboo ( Phyllostachys edulis) is a strong isoprene emitter ( Okumura et al., 2018 Chang et al., 2019), and it is expected to be a model plant of the grass family Gramineae to study isoprene emission ( Melnychenko and Rosenstiel., 2015). However, isoprene emissions are species-dependent and strongly influenced by environmental conditions ( Sharkey et al., 1996 Harley et al., 1999 Lyu et al., 2021) most studies primarily focus on arbor species with high emissions (e.g., Populus, Eucalyptus, Quercus).īamboos are considered a novel system for studying BVOC emissions because their emissions are widely variable across species ( Melnychenko and Rosenstiel., 2015). Therefore, the quantitative prediction of plant isoprene emissions is essential for understanding climate change and assessing air quality at the regional scale ( Guenther et al., 2006 Monson et al., 2012). Furthermore, isoprene competes with methane for radicals, such as hydroxyl, subsequently resulting in a longer lifetime of methane in the atmosphere and intensifying the global greenhouse effect ( Poisson et al., 2000 Guenther, 2008). Owing to its high abundance and atmospheric reactivity, isoprene plays a crucial role in tropospheric chemistry and climate change, particularly in the production of ozone (O 3) and secondary organic aerosols ( Fehsenfeld et al., 1992 Claeys et al., 2004 Mentel et al., 2013). Isoprene (C 5H 8) is the dominant BVOC emitted into the atmosphere and constitutes approximately half of the total global BVOCs ( Guenther, 2008 Guenther et al., 2012). These substances influence oxidants and aerosols, resulting in complex feedback on air quality and climate ( Paulot et al., 2009). Terrestrial vegetation releases massive volumes of biogenic volatile organic compounds (BVOCs) to the atmosphere at a rate of approximately 1 Pg C annually on a global scale ( Guenther et al., 2012). Additionally, because the Iso and C-loss of old bamboo were higher than those of mature bamboo, we suggest that attention should be paid to the management of bamboo age structure and timely felling of aged bamboo to reduce environmental risk. Therefore, we strongly recommend considering the culm age when establishing an isoprene emission model of Moso bamboo. Moreover, the percentage of carbon loss as isoprene emission (C-loss) during photosynthesis of old bamboo was 35% higher than that of mature bamboo under standard conditions (leaf temperature: 30☌ light intensity: 1000 µmol m -2 s -1). The results showed that the age effect on isoprene emission was different from that on photosynthesis the net photosynthesis rate (Pn) was the highest in young, followed by mature, and then old bamboo, whereas the isoprene emission rate (Iso) was the highest in young, followed by old, and then mature bamboo. In this study, we investigated the photosynthetic and isoprene emission characteristics of Moso bamboo at different culm ages. Carbon sequestration is negatively correlated with culm age however, the effect of this correlation on isoprene emissions remains unknown. Moso bamboo ( Phyllostachys edulis), a species widely distributed in tropical and subtropical regions, particularly in China, is a strong isoprene emitter with great potential for carbon sequestration. Isoprene is a highly reactive volatile organic compound that significantly affects atmospheric oxidant capacity, regional air quality, and climate change. 7Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada.6Zhejiang Provincial Key Laboratory of Forest Aromatic Plants-based Healthcare Functions, Zhejiang A&F University, Hangzhou, China.5College of Horticulture Science, Zhejiang A&F University, Hangzhou, China.4Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou, China.3Wenzhou Vocational College of Science and Technology, Wenzhou, China.2Lishui Academy of Agricultural and Forestry Sciences, Lishui, China.1State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, China.Yandong Song 1,2, Chunju Peng 3, Qinjiao Wu 1,4, Shijie Tao 1,4, Tingting Mei 1,4, Zhihong Sun 1,5, Zhaojiang Zuo 1,6, Chunyu Pan 1,7, Yufeng Zhou 1,4 and Guomo Zhou 1,4*
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