| 北方常见绿化树种BVOCs排放特征及其与光合作用参数的相关性 |
| 摘要点击 1735 全文点击 655 投稿时间：2020-01-20 修订日期：2020-03-06 |
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| 中文关键词 绿化树种 异戊二烯和单萜 植物源挥发性有机化合物(BVOCs) 光合参数 相关性 |
| 英文关键词 greening tree species isoprene and monoterpenes biogenic volatile organic compounds (BVOCs) photosynthetic parameters correlation |
| 作者 | 单位 | E-mail | | 许燕 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏省大气环境与装备技术协同创新中心, 南京 210044
中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | xyzzka1011@163.com | | 李双江 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | | | 袁相洋 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | xyyuan@rcees.ac.cn | | 冯兆忠 | 南京信息工程大学应用气象学院, 生态研究院, 南京 210044 | zhaozhong.feng@nuist.edu.cn |
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| 中文摘要 |
| 为了解北方常见绿化树种植物源挥发性有机化合物（biogenic volatile organic compounds，BVOCs）的排放特征及其与光合作用参数（净光合速率Pn、气孔导度gs、胞间CO2浓度ci、蒸腾速率Tr）的相关性，本实验采用动态采样装置收集14种落叶乔木BVOCs排放数据.结果表明，不同科属间异戊二烯和总BVOCs（异戊二烯、单萜和倍半萜烯之和）释放速率差异显著（P<0.01）.除金银木和榆树，其他绿化树种均释放异戊二烯、单萜和倍半萜烯类物质，其中杨柳科（杂交杨‘546’、速生杨‘107’、小叶杨、垂柳）和豆科植物（国槐、刺槐、龙爪槐）排放异戊二烯较多，释放速率在（30.1±4.3）～（91.8±10.0）μg·（g·h）-1之间；木犀科（白蜡、丁香）、蔷薇科海棠、无患子科栾树和槭树科元宝枫主要排放单萜和倍半萜烯，其中白蜡和元宝枫单萜释放速率最高，分别为（10.6±4.8）μg·（g·h）-1和（11.8±6.4）μg·（g·h）-1.罗勒烯和β-蒎烯是绿化树种排放的两种主要单萜物质.Pn和gs与BVOCs释放速率之间无显著相关性，但杨柳科植物异戊二烯（r=0.681，P<0.01）和总BVOCs（r=0.698，P<0.01）释放速率与叶片Tr呈显著正相关，而豆科植物的总BVOCs释放速率与ci呈显著正相关（P=0.04）.本研究为城市绿化树种的筛选和配置提供科学参考，也为BVOCs释放机制的研究提供理论依据. |
| 英文摘要 |
| In order to understand the emission characteristics of common greening trees in Beijing and analyze their correlations with photosynthetic parameters, including the net photosynthetic rate (Pn), stomatal conductance (gs), intercellular CO2 concentration (ci), and transpiration rate (Tr), we collected samples of biogenic volatile organic compounds (BVOCs) using a dynamic sampling technique from 14 species of deciduous trees. The results showed that there were significant differences in isoprene and total BVOC emissions between family or genus levels (P<0.01). With the exception of Lonicera maackii Maxim and Ulmus pumila L., all species were found to emit isoprene, monoterpenes, and sesquiterpenes, of which, species from the Salicaceae (e.g., Populus deltoides cv. ‘55/56’× P.deltoides cv. ‘Imperial’, P. euramericana cv. ‘74/76’, Populus simonii Carr, and Salix babylonica) and Legume (Sophora japonica, Robinia pseudoacacia, and S. japonica Linn. var. japonica f. pendula Hort) families were the higher isoprene emitters, with emission rates that ranged from (30.1±4.3) μg·(g·h)-1 to (91.8±10.0) μg·(g·h)-1. Plants from the Oleaceae (e.g., Fraxinus chinensis Roxb and Syringa oblata Lindl), Begonia (Malus prunifolia), Sapindaceae (Koelrenteria paniculate), and Aceraceae (Acer truncatum Bunge) families mainly emitted monoterpenes and sesquiterpenes. Among them, Fraxinus chinensis Roxb and Acer truncatum Bunge were the highest emitters with emission rates of (10.6±4.8) μg·(g·h)-1 and (11.8±6.4) μg·(g·h)-1, respectively. Ocimene and β-pinene were the two main monoterpenes emitted from greening tree species. No significant correlations were found between the emission of BVOCs and Pn or gs, while the emission rate of isoprene (r=0.681; P<0.01) and the total BVOC (r=0.698; P<0.01) from the Salicaceae family increased with increasing Tr. Moreover, leguminous plants showed a significant positive correlation between the total BVOC emission rate and ci (P=0.04). This study provides a scientific reference for the selection and configuration of urban greenery, and a theoretical basis for exploring the mechanism of BVOC emissions. |
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