Isoprene emission rates and fluxes measured above a Mediterranean oak (Quercus pubescens) forest

Biogenic emissions by Q. pubescens were determined by the enclosure of an intact branch of this tree in a Teflon cuvette. The total monoterpenic emission rates thus recorded were found to reach maximum values ranged between 40 and 350 μg gDry Weight−1 h−1. Emissions were correlated strongly with leaf temperature and Photosynthetic Active Radiation (PAR). The fluxes were also determined by extrapolating the results of the enclosure method and by using aerodynamic gradient method. They reach around 73 mg m−2 h−1 with the first method and 55 mg m−2 h−1 with the second one. The obtained values fit with a maximal ratio of 2.