Leaf level emissions of volatile organic compounds (VOC) from some Amazonian and Mediterranean plants

Abstract

As volatile organic compounds (VOCs) significantly affect atmospheric chemistry (oxidative capacity) and physics (secondary organic aerosol formation and effects), emission inventories defining regional and global biogenic VOC emission strengths are important. The aim of this work was to achieve a description of VOC emissions from poorly described tropical vegetation to be compared with the quite well investigated and highly heterogeneous emissions from Mediterranean vegetation. For this task, common plant species of both ecosystems were investigated. Sixteen plant species from the Mediterranean area, which is known for its special diversity in VOC emitting plant species, were chosen. In contrast, little information is currently available regarding emissions of VOCs from tropical tree species at the leaf level. Twelve plant species from different environments of the Amazon basin, i.e. Terra firme, Várzea and Igapó, were screened for emission of VOCs at leaf level with a branch enclosure system. Analysis of the volatile organics was performed online by a proton-transfer-reaction mass spectrometer (PTR-MS) and offline by collection on adsorbent tubes and subsequent gas chromatographic analysis. Isoprene was quantitatively the most dominant compound emitted followed by monoterpenes, methanol and acetone. Most of the Mediterranean species emitted a variety of monoterpenes, whereas only five tropical species were monoterpene emitters exhibiting a quite conservative emission pattern (α-pinene > limonene > sabinene > β-pinene). Mediterranean plants showed additional emissions of sesquiterpenes, whereas in the case of plants from the Amazon region no sesquiterpenes were detected probably due to a lack of sensitivity in the measuring systems. On the other hand methanol emissions, an indicator of growth, were common in most of the tropical and Mediterranean species. A few species from both ecosystems showed acetone emissions. The observed heterogeneous emissions including reactive VOC species which are not easily detected by flux measurements, give reason to perform more screening at leaf level and, whenever possible, within the forests under ambient conditions

Reconciling functions and evolution of isoprene emission in higher plants

“…The emission of isoprene is often replaced by the emission of monoterpenes in evergreen plants, as noted previously (Loreto et al, 1998;Harrison et al, 2013;Dani et al, 2014). Interestingly, there are cases, such as in Hevea brasilensis, in which the evergreen habit of the plant in the tropics is associated with monoterpene emissions (Bracho-Nunez et al, 2013), but in more temperate stations, and in the presence of environmental stresses, isoprene emission is recorded (Baker et al, 2005).…”

“…The emission of isoprene is often replaced by the emission of monoterpenes in evergreen plants, as noted previously (Loreto et al ., ; Harrison et al ., ; Dani et al ., ). Interestingly, there are cases, such as in Hevea brasilensis , in which the evergreen habit of the plant in the tropics is associated with monoterpene emissions (Bracho‐Nunez et al ., ), but in more temperate stations, and in the presence of environmental stresses, isoprene emission is recorded (Baker et al ., ). The emission of isoprene is more common in fast‐growing plants that do not endure long periods of environmental stress (Dani et al ., ). Again, this pattern is widespread across plant taxonomic groups; for example, strong isoprene emitters are fast‐growing dicots, such as poplars and willows, and fast‐growing monocots, such as reeds (e.g.…”