Ecophysiological responses of two tropical urban shrub plants to elevated carbon dioxide and water stress

N. Wan Nur Ain, Wan Juliana Wan Ahmad

Research output: Contribution to journalArticle

Abstract

Elevated atmospheric carbon dioxide causes changes in most plant species in terms of physiological and morphological properties. In this study, we elucidate the effects of elevated CO2 and water regimes on two species of shrubs which were Melastoma malabathricum and Clidemia hirta. The factor of water stress was also included whereby for each CO2 treatment, the amount of water was given once or twice daily. The treatment of elevated CO2 was at 800 ppm, where the plants were exposed for two hours daily and ambient CO2 at 400 ppm as the control. The growth of plants was monitored through their height, leaf area and biomass that were recorded fortnightly for six months. The physiological changes were determined via stomatal conductance, photosynthetic rate and transpiration rate. The results revealed that each species responded differently to the CO2 treatments. The growth parameters of height and leaf area index showed positive responses on elevated CO2 and twice watering for both species. As for biomass, M. malabathricum exhibited higher below ground biomass compared to above ground biomass in the elevated CO2. In contrast, C. hirta showed the opposite trend. The results of the three physiological parameters demonstrated a bell shape trend for both treatments with the highest rate at the fifth month.

Original languageEnglish
Pages (from-to)177-188
Number of pages12
JournalMalaysian Applied Biology
Volume46
Issue number1
Publication statusPublished - 1 Mar 2017

Fingerprint

Dehydration
Carbon Dioxide
Biomass
water stress
shrubs
carbon dioxide
Clidemia hirta
Melastoma malabathricum
Water Purification
Growth
Water
belowground biomass
biomass
leaf area index
aboveground biomass
stomatal conductance
transpiration
leaf area
water
plant growth

Keywords

  • Elevated CO
  • Growth
  • Photosynthesis
  • Shrubs
  • Tropical plant

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Ecophysiological responses of two tropical urban shrub plants to elevated carbon dioxide and water stress. / Wan Nur Ain, N.; Wan Ahmad, Wan Juliana.

In: Malaysian Applied Biology, Vol. 46, No. 1, 01.03.2017, p. 177-188.

Research output: Contribution to journalArticle

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