Abstract ID: 319

Estimation of the emission of isoprene and monoterpenes of a mountains tropical Peruvian forest

Tropical forests are big contributors of volatile organic compounds.The gases that the vegetation emits them fulfill important functions in the chemistry of the atmosphere as much too local level as regional and global. The emission from the tropical cloud forests has a particular interest because of its great quantity of biomass and vegetable diversity. Nevertheless, these have been slightly studied. Inside this work, the emission of biogenic isoprene and monoterpenes has estimated in a plot of Yanachaga-Chemillen National park of Peru located at an altitude of 2400 m. The biomass was evaluated from the characterization of the vegetation of the above mentioned plot, and together with measurements of temperature environment and photosynthetically active radiation, a mathematical semiempirical model and indexes of emission took from literature there was calculated the emission of these two chemical species. The characterization of the vegetation reported an average of foliates 225 g m-2 of density of foliate biomass, being the genera Ficus the one that most contribute to the emission of isoprene with 67.36 gC ha-1 h-1,whereas Eugenia genera to the emission of monoterpenes with 0.40 gC ha-1 h-1. In an additional way, air samples have collected to different heights inside and on the canopy of the forest. The samples were collected by cartridge equipped with carbotrap and tenax filters and were analyzed by gas chromatography and spectrometry of masses, where the isoprene registered an average concentration of 108 pptv for the samples collected during 15:00 h, whereas the most abundant monoterpenes was the limonene with 133 pptv to 18:00 h. The levels of isoprene were lower than the reported ones for other places of the Amazonian, but the monoterpenes were major. It was confirm that the emission of isoprene is strongly related to the temperature and the solar radiation and that the concentrations of monoterpenes are influenced by the rainfall and speed of the wind.

Session:  Feedbacks to Climate - Emissions of natural and biomass burning particulates from vegetation and their effects on ecosystems and climate.

Presentation Type:  Poster