• 关键词：生物源挥发性有机化合物  温度  光照  红花檵木  南天竹  城市绿色植物

• 基金项目：国家自然科学基金项目（No.41877326，41473083）

• 林威
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 赵振
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 赖金美
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 刘燕飞
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 黄幸然
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 易志刚
• 福建农林大学资源与环境学院, 土壤环境健康与调控福建省重点实验室, 福州 350002

• 摘要：植物是生物源挥发性有机化合物（Biogenic volatile organic compounds，BVOCs）的最主要来源，城市绿色植物释放的BVOCs会影响城市大气组分，进而改变城市大气环境.本实验以红花檵木（Loropetalum chinense）和南天竹（Nandina domestica）为研究对象，调节温度（T）和光合有效辐射（PAR），测量两种植物主要BVOCs （异戊二烯（Isoprene，ISO）、单萜烯（Monoterpenes，MTs））的通量及光合参数.结果表明，在T=30℃、PAR=500 μmol·m^-2·s^-1时，南天竹BVOCs释放速率大于红花檵木，分别为4916.51和3388.62 pmol·m^-2·s^-1，BVOCs释放种类以ISO为主，占BVOCs总量99.8%以上，MTs以α-蒎烯和3-蒈烯为主.ISO释放速率随温度升高而增加，35℃时达到最大值，红花檵木和南天竹分别为8436.48和15138.81 pmol·m^-2·s^-1，显著高于其他两种温度下ISO释放；而单萜烯在30℃时最大，分别为4.96和8.24 pmol·m^-2·s^-1，红花檵木单萜烯的释放受温度影响较为显著.PAR增加会显著促进两种植物ISO的释放，PAR=1000 μmol·m^-2·s^-1时红花檵木和南天竹释放速率分别达3279.21和7355.17 pmol·m^-2·s^-1，而单萜烯释放在PAR为500 μmol·m^-2·s^-1最高.温度和光照主要通过影响植物气孔导度和蒸腾速率等从而影响其BVOCs的释放，不同温度和光照处理下，异戊二烯释放碳占光合作用固定碳的0~3.28%.不同植物BVOCs释放对温度和光照响应的差异要求加强对城市绿色植物BVOCs释放的研究，以便为城市绿化树种选择及城市生态环境改善提供科学依据.

• Abstract：Plant is the major source of biogenic volatile organic compounds (BVOCs), and BVOCs from urban green plant can influence the urban atmospheric component, and thus cause the change of urban atmospheric environment. In this study, two green plants namely Loropetalum chinense and Nandina domestica were selected and investigated under three different temperature (T=25, 30 and 35 ℃) and photosynthetically active radiation (PAR=0, 500 and 1000 μmol·m^-2·s^-1) levels. BVOC emission species (mainly Isoprene (ISO) and Monoterpenes (MTs)), emission rates, and related photosynthetic parameters were measured. The results showed that under the conditions of T=30 ℃ and PAR=500 μmol·m^-2·s^-1, total BVOC emission rates from N. domestica were significantly higher than those from L. chinense, with the values of 4916.51 and 3388.62 pmol·m^-2·s^-1, respectively. The dominant BVOC species of ISO accounted for about 99.8% to the total BVOCs, while α-pinene and 3-carene were the main MT species. ISO emission rates from both plants increased with temperature increasing, with the largest values of 8436.48 and 15138.81 pmol·m^-2·s^-1 for L. chinense and N. domestica at 35 ℃, respectively, which were significantly higher than other conditions. However, the highest MT emission rates appeared at 30 ℃, with the values of 4.96 and 8.24 pmol·m^-2·s^-1, respectively, and L. chinense monoterpene emissions were significantly influenced by temperature. The increasing of PAR significantly promoted the ISO emission from both plants, with the highest rate of 3279.21 and 7355.17 pmol·m^-2·s^-1 for L. chinense and N. domestica at 1000 μmol·m^-2·s^-1, respectively, while the highest MT emission rate was detected at 500 μmol·m^-2·s^-1. The influence of temperature and PAR on BVOC emissions from both plants was mainly through the influencing on their stomatal conductance and transpiration rate, etc., with the ratio of 0~3.28% for carbon lost as isoprene to total assimilative carbon by photosynthesis. Considering the importance of BVOCs in urban atmospheric environment, and the different responses of BVOC emission from different plants to temperature and light, it is urgent to investigate the BVOC emission from urban green plant, which can provide a scientific basis for the selection of urban greening plant species and the improvement of the urban ecological environment.

• Key words：BVOCs  temperature  light  Loropetalum chinense  Nandina domestica  urban green plant

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