Pinus halepensis and Quercus ilex terpene emission as affected by temperature and humidity

The short-term relationships of monoterpene emission with temperature and r elative humidity were studied in Pinus halepensis L. and Quercus ilex L. se edlings grown in air-conditioned chamber. In P. halepensis terpene emission rate increased with temperature (from 15 to 35 degrees C) and relative hum idity (from 40 - 60 to 65 - 95 %). In Q. ilex, a terpene non-storing specie s, it increased with temperature only at high relative humidities but not a t relative humidities lower than 60 %.