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Isoprene emission from tropical tree species
1School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110 067, India. padhypk2003@yahoo.com
Environmental Pollution (Barking, Essex : 1987)
|February 11, 2005
Summary
Six of nine Delhi tree species emit isoprene, a volatile organic compound. Ficus religiosa showed the highest emission rates, with significant daily variations observed across species.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Plant Physiology
Background:
- Isoprene is a significant biogenic volatile organic compound (BVOC) emitted by vegetation, influencing atmospheric chemistry and air quality.
- Understanding regional BVOC emissions is crucial for accurate atmospheric modeling and pollution control strategies.
Purpose of the Study:
- To quantify foliar isoprene emission rates in nine common tree species growing in Delhi, India.
- To identify tree species with significant isoprene emissions and assess seasonal and diurnal variations.
- To provide preliminary estimates of annual biogenic VOC emissions for the region.
Main Methods:
- Utilized the dynamic flow enclosure technique for gas sampling from tree leaves.
- Collected samples onto Tenax-GC/Carboseive cartridges for subsequent analysis.
- Employed gas chromatography (GC) with a flame ionization detector (FID) for quantitative analysis of isoprene.
Main Results:
- Isoprene emission was detected in six out of nine studied tree species.
- Ficus religiosa exhibited the highest average hourly emission rate (10.2 ± 6.8 µg g⁻¹ dry weight), while Melia azedarach showed the lowest (2.2 ± 4.9 µg g⁻¹ dry weight).
- Rainy season emissions averaged 3.9–8.5 µg g⁻¹ dry weight across six species, with significant diurnal variations observed.
Conclusions:
- Foliar isoprene emission varies considerably among tree species in Delhi, with Ficus religiosa being a major contributor.
- The study provides foundational data for estimating biogenic VOC emissions in India, highlighting the need for species-specific emission factors.
- Further research is needed to refine annual emission estimates and understand the broader atmospheric implications of these emissions.
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