Environmental and physiological controls on diurnal and seasonal patterns of biogenic volatile organic compound emissions from five dominant woody species under field conditions
Environmental and physiological controls on diurnal and seasonal patterns of biogenic volatile organic compound emissions from five dominant woody species under field conditions
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田间条件下五种主要木本物种生物挥发性有机化合物排放的昼夜和季节模式的环境和生理控制
DOI：
10.1016/j.envpol.2020.113955
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发表时间：
2020-04-01
影响因子：
8.9
通讯作者：
Yu, Xinxiao
中科院分区：
文献类型：
--
作者：
Chen, Jungang;Tang, Jing;Yu, Xinxiao
生物源挥发性有机化合物（BVOCs）在区域和全球范围内的对流层化学中发挥着重要作用。大量的物种特异性BVOC的排放不仅取决于环境（温度，T;光合有效辐射，PAR），而且还取决于生理参数（即净光合速率，Pn;蒸腾速率，Tr;气孔导度，g和胞间CO2浓度，Ci）。本文测定了北方5种主要成熟木本树种的异戊二烯、单萜和倍半萜排放量，它们是2种万年青针叶树（油松和侧柏）和3种阔叶落叶树（栓皮栎、毛白杨和刺槐）。采用动态封闭技术结合GC-MS对BVOCs进行采样，分析其日尺度和年尺度的组分组成。昼夜数据表明，异戊二烯和单萜的排放量均随温度的升高而增加，且在生长季的高峰期达到最大值。所有物种的单萜和倍半萜内的单个化合物的排放量在统计上彼此相关。此外，一些含氧单萜排放量在所有树种的倍半萜烯高度相关。将BVOC排放量与环境和叶片生理参数联系起来，发现单萜排放量与T、PAR、Pn和Tr的变化呈线性正相关，而与g1和C1的关系较为复杂。总的来说，这些研究结果提供了重要的信息，以改善目前的模型估计BVOC排放量和植物生理性状之间的联系。本研究中提供的数据可用于更新模型中使用的排放能力，因为这是首次报告该地区五种主要物种的BVOC排放量。全年测量叶片水平的BVOC也可以提高我们对BVOC排放的季节变化的理解。(C)2020爱思唯尔有限公司版权所有。
Biogenic volatile organic compounds (BVOCs) play essential roles in tropospheric chemistry, on both regional and global scales. The emissions of large quantities of species-specific BVOC depend not only on environmental (temperature, T; photosynthetically active radiation, PAR), but also physiological parameters (i.e. net photosynthetic rate, P-n; transpiration rate, T-r; stomatal conductance, g and intercellular CO2 concentration, C-i). Here, isoprene, monoterpene and sesquiterpene emissions were determined from five dominant mature woody tree species in northern China, which are two evergreen conifers (Pinus tabuliformis and Platycladus orientalis) and three broad-leaved deciduous trees (Quercus variabilis, Populus tomentosa and Robinia pseudoacacia). A dynamic enclosure technique combined with GC-MS was used to sample BVOCs and analyse their fractional composition at daily and annual scales. The diurnal data showed that both isoprene and monoterpene emissions increased with increasing temperature, and reached their maximum emission rates in the peak of growing season for both coniferous and broad-leaved species. The emissions of individual compound within the monoterpenes and sesquiterpenes were statistically correlated with each other for all species. Furthermore, some oxygenated monoterpene emissions were highly correlated to sesquiterpenes in all tree species. Linking BVOC emissions to environmental and leaf physiological parameters exhibited that monoterpene emissions were linearly and positively correlated to the variation of T, PAR, P-n and T-r, while their relationship to g, and C-i is more complex. Collectively, these findings provided important information for improving current model estimations in terms of the linkage between BVOC emissions and plant physiological traits. The data presented in this study can be used to update emission capacity used in models, as this is the first time of reporting BVOC emissions from five dominant species in this region. The whole-year measurement of leaf-level BVOCs can also advance our understanding of seasonal variation in BVOC emissions. (C) 2020 Elsevier Ltd. All rights reserved.