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Journal of Plant Ecology Advance Access originally published online on April 10, 2009
Journal of Plant Ecology 2009 2(2):69-75; doi:10.1093/jpe/rtp006
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© The Author 2009. Published by Oxford University Press on behalf of the Institute of Botany, Chinese Academy of Sciences and the Botanical Society of China. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Comparative response of seedlings of selected native dry tropical and alien invasive species to CO2 enrichment

Purnima Raizada1,*, Anamika Singh2 and A. S. Raghubanshi1

1 Ecosystems Analysis Laboratory, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
2 Department of Botany, Punjab University, Chandigarh 160014, Punjab, India

* Correspondence address. Ecosystems Analysis Laboratory, Centre of Advanced Study in Botany, Banaras Hindu University-221005, India. Tel: 05422368399; Fax: 05422368174; E-mail: purnimaraizada{at}gmail.com

Aims: Global climate change and ongoing plant invasion are the two prominent ecological issues threatening biodiversity world wide. Among invasive species, Lantana camara and Hyptis suaveolens are the two most important invaders in the dry deciduous forest in India. We monitored the growth of these two invasive species and seedlings of four native dry deciduous species (Acacia catechu, Bauhinia variegata, Dalbergia latifolia and Tectona grandis) under ambient (375–395 µ mol mol–1) and elevated CO2 (700–750 µ mol mol–1) to study the differential growth response of invasive and native seedlings.

Methods: Seedlings of all the species were exposed to ambient and elevated CO2. After 60 days of exposure, seedlings were harvested and all the growth-related parameters like plant height; biomass of root, stem and leaves; total seedling biomass; R/S ratio; allocation parameters; net assimilation rate (NAR) and relative growth rate (RGR) were determined.

Important Findings: Biomass, RGR and NAR of all the species increased under elevated CO2 but the increase was higher in invasive species and they formed larger seedlings than natives. Therefore under the CO2-enriched future atmosphere, competitive hierarchies could change and may interfere with the species composition of the invaded area.

Keywords: dry deciduous seedlings • elevated CO2 • global change • plant invasion


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