[摘要] Leaf and woody plant tissue (
Pinus ponderosa,
Eucalyptus saligna,
Quercus gambelli,
Saccharum officinarum and
Oriza sativa) were heated from 30 to300°C and volatile organic compound (VOC) emissions were identified andquantified. Major VOC emissions were mostly oxygenated and included acetic acid, furylaldehyde, acetol,pyrazine, terpenes, 2,3-butadione, phenol and methanol, as well assmaller emissions of furan, acetone, acetaldehyde, acetonitrile andbenzaldehyde. Total VOC emissions from distillation and pyrolysis were onthe order of 10 gC/kgC dry weight of vegetation, as much as 33% and44% of CO
2 emissions (gC(VOC)/gC(CO
2)) measured during thesame experiments, in air and nitrogen atmospheres, respectively.
The emissions are similar in identity and quantity to those from smolderingcombustion of woody tissue and of different character than those evolvedduring flaming combustion. VOC emissions from the distillation of pools andendothermic pyrolysis under low turbulence conditions may produceflammable concentrations near leaves and may facilitate the propagation of wildfires. VOCemissions from charcoal production are also related to distillation andpyrolysis; the emissions of the highly reactive VOCs from production are aslarge as the carbon monoxide emissions.
