海口市常见榕属植物BVOCs排放特征及与环境因素相关性  

Characteristics of BVOCs Emissions from Common Ficus spp.in Haikou City and Correlation with Environmental Factor

作　　者：付彦 何禾[1,2] 杨宗德 FU Yan;HE He;YANG Zongde(College of Ecology and Environment,Hainan University,Haikou,Hainan 570228,China;Center for Eco-Environment Restora-tion Engineering of Hainan Province,Haikou,Hainan 570228,China;Bawangling Forestry Bureau of Hainan Province,Changji-ang,Hainan 572722,China)

机构地区：[1]海南大学生态学院,海南海口570228 [2]海南省热带生态环境修复工程研究中心,海南海口570228 [3]海南热带雨林国家公园管理局霸王岭分局,海南昌江572722

出　　处：《热带作物学报》2024年第11期2448-2460,共13页Chinese Journal of Tropical Crops

基　　金：海南省自然科学基金青年基金项目(No.419QN174);海南省自然科学基金面上基金项目(No.420MS118);国家自然科学基金地区基金项目(No.31660145)

摘　　要：植物挥发性有机化合物(biogenic volatile organic compounds,BVOCs)是生物圈与大气之间的重要纽带,对大气化学、臭氧形成和二次有机气溶胶形成起着至关重要的作用。城市森林公园和绿化植物产生的挥发性排放物会对当地和区域空气质量产生重大影响。本研究选取了海口种植率较高的2种常见榕属植物,采用动态顶空套袋采集法和气质联用仪的鉴定分析,测量印度榕和高山榕的BVOCs排放量,并探讨其BVOCs的化学组分和排放特征。同时,试验持续监测环境因子[温度(T)、光合有效辐射(PAR)]和生理参数[气孔导度(Gs)、胞间二氧化碳浓度(Ci)、蒸腾速率(Tr)],进一步分析榕属BVOCs排放的驱动因素。结果表明:印度榕和高山榕分别鉴定出19种和12种化合物,榕属植物BVOCs的排放以异戊二烯和萜类化合物为主,其中印度榕异戊二烯在雨季排放相对含量比旱季增大1.82倍,可见印度榕具有较大的异戊二烯排放潜力。萜烯化合物中的α-蒎烯、石竹烯贡献度较大。榕属BVOCs日变化呈现“早晚低、中午高”的单峰排放模式,BVOCs排放量最大出现在中午12:00或14:00温度的或光合有效辐射最高的时刻。在雨季榕属BVOCs排放量显著高于旱季排放量。此外,榕属BVOCs排放量与环境因素的相关性具有一致性,与温度、光合有效辐射呈正相关,与其自身的生理参数蒸腾速率、气孔导度均呈正相关,与胞间CO_(2)浓度呈负相关。本研究拓展了热带榕属植物BVOCs排放特征的研究领域,为丰富热带和亚热带区域植物BVOCs排放清单数据库及其环境效应评估提供基础数据。Biogenic volatile organic compounds(BVOCs)serve as a critical link between the biosphere and the atmos-phere,playing a vital role in atmospheric chemistry,ozone formation,and the creation of secondary organic aerosols.Volatile emissions from urban forest parks and greenery can have a significant impact on local and regional air quality.In this study,two common Ficus spp.plants with a high planting rate in Haikou were selected,and the BVOCs emis-sions of F.elastica and F.altissima were measured using the dynamic headspace bagging collection method and identi-fication and analysis by gas chromatograph.The chemical components and emission characteristics of the BVOCs were also investigated.Meanwhile,the experiment continuously monitored environmental factors[temperature(T),photo-synthetically active radiation(PAR)]and physiological parameters[stomatal conductance(Gs),intercellular CO2 con-centration(Ci),transpiration rate(Tr)]to further analyze the driving factors of BVOCs emissions in Ficus spp.The re-sults showed 19 and 12 compounds identified for F.elastica and F.altissima.BVOCs emissions from Ficus spp.were dominated by isoprene and terpenoids.Among them,the relative content of isoprene emission from F.elastica increased by 1.82 times in the rainy season compared to the dry season,indicating that F.elastica has a significant potential for isoprene emission.The terpene compoundsα-pinene and Caryophyllene made significant contribution.The daily varia-tion of BVOCs in Ficus spp.showed a single-peak emission pattern of“low in the morning and low in the evening,high in the middle of the day”,with the maximum emission of BVOCs occurring at 12:00 or 14:00 noon,when the tem-perature or photosynthetically active radiation was the highest.BVOCs emissions from Ficus spp.were significantly higher in the rainy season than they were in the dry season.In addition,the BVOCs emissions of Ficus spp.were posi-tively correlated with the temperature and with the photosynthetically active radiation.BVOCs emissions were posi-tive

关 键 词：植物挥发性有机物 异戊二烯 单萜 环境因素 生理参数 

分 类 号：S687[农业科学—观赏园艺]