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Proceedings of the International Academy of Ecology and Environmental Sciences, 2018, 8(4): 204-212
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Article

Seasonality in emission patterns of isoprene from two dominant tree species of Central India: Implications on terrestrial carbon emission and climate change

Tanzil Gaffar Malik, Triratnesh Gajbhiye, Sudhir Kumar Pandey
Department of Botany, Guru Ghasidas Central University, Bilaspur, 495009, C.G., India

Received 25 June 2018;Accepted 30 July 2018;Published 1 December 2018
IAEES

Abstract
A significant quantity of biogenic volatile organic compounds (BVOCs) is emitted mainly from terrestrial plants. Among them, isoprene is the most abundant, which is emitted in enormous quantities from various plant species. Their emission is temperature and light dependent. Therefore, we discuss here the variations in the emission rate of isoprene under different seasons along with environmental parameters such as temperature, CO₂, relative humidity and photosynthetic active radiation (PAR). For this purpose, isoprene emission rates from two dominant tropical tree species (Dalbergia sissoo and Shorea robusta) were measured across different seasons using a dynamic enclosure chamber. Significantly high seasonal variations in isoprene emission rates were observed in both the tree species. A clear seasonal cycle was detected with the highest emission rates in summer which decreases in winter. However, a gradual increase was again observed in rainy season. Correlation analysis revealed that isoprene emission were mainly temperature and PAR dependent. The information on emission rates of isoprene is relevant for air quality modelling studies and urban forestry programmes and terrestrial carbon loss. Moreover, their emission pattern tied with the global climate change conditions may surplus the emission rates of BVOCs in future especially in tropical regions.

Keywords isoprene;seasonal variations;average normalized emission rate;terrestrial carbon loss;climate change.

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